From 189d0791765d3205690e28333106b49fb1f68bea Mon Sep 17 00:00:00 2001
From: Seun Lanlege <seun@parity.io>
Date: Wed, 24 Mar 2021 11:28:26 +0100
Subject: [PATCH] test runner (#7665)

---
 Cargo.lock                                   | 425 +++++++++++------
 Cargo.toml                                   |   2 +
 bin/node/test-runner-example/Cargo.toml      |  40 ++
 bin/node/test-runner-example/src/lib.rs      | 202 ++++++++
 client/executor/src/native_executor.rs       |  14 +-
 frame/babe/src/tests.rs                      |   1 -
 test-utils/test-runner/Cargo.toml            |  61 +++
 test-utils/test-runner/src/host_functions.rs |  70 +++
 test-utils/test-runner/src/lib.rs            | 312 ++++++++++++
 test-utils/test-runner/src/node.rs           | 476 +++++++++++++++++++
 test-utils/test-runner/src/utils.rs          |  56 +++
 11 files changed, 1502 insertions(+), 157 deletions(-)
 create mode 100644 bin/node/test-runner-example/Cargo.toml
 create mode 100644 bin/node/test-runner-example/src/lib.rs
 create mode 100644 test-utils/test-runner/Cargo.toml
 create mode 100644 test-utils/test-runner/src/host_functions.rs
 create mode 100644 test-utils/test-runner/src/lib.rs
 create mode 100644 test-utils/test-runner/src/node.rs
 create mode 100644 test-utils/test-runner/src/utils.rs

diff --git a/Cargo.lock b/Cargo.lock
index 045b2780c4bf6..cd3d3b6608619 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -482,6 +482,16 @@ version = "1.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf1de2fe8c75bc145a2f577add951f8134889b4795d47466a54a5c846d691693"
 
+[[package]]
+name = "bitvec"
+version = "0.17.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "41262f11d771fd4a61aa3ce019fca363b4b6c282fca9da2a31186d3965a47a5c"
+dependencies = [
+ "either",
+ "radium 0.3.0",
+]
+
 [[package]]
 name = "bitvec"
 version = "0.20.2"
@@ -489,7 +499,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1f682656975d3a682daff957be4ddeb65d6ad656737cd821f2d00685ae466af1"
 dependencies = [
  "funty",
- "radium",
+ "radium 0.6.2",
  "tap",
  "wyz",
 ]
@@ -645,6 +655,12 @@ version = "3.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "63396b8a4b9de3f4fdfb320ab6080762242f66a8ef174c49d8e19b674db4cdbe"
 
+[[package]]
+name = "byte-slice-cast"
+version = "0.3.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b0a5e3906bcbf133e33c1d4d95afc664ad37fbdb9f6568d8043e7ea8c27d93d3"
+
 [[package]]
 name = "byte-slice-cast"
 version = "1.0.0"
@@ -1618,7 +1634,7 @@ dependencies = [
  "futures-timer 3.0.2",
  "log",
  "num-traits",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "parking_lot 0.11.1",
  "rand 0.8.3",
 ]
@@ -1664,7 +1680,7 @@ checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1"
 name = "fork-tree"
 version = "3.0.0"
 dependencies = [
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
 ]
 
 [[package]]
@@ -1686,7 +1702,7 @@ dependencies = [
  "hex-literal",
  "linregress",
  "log",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "paste 1.0.4",
  "serde",
  "sp-api",
@@ -1705,7 +1721,7 @@ dependencies = [
  "chrono",
  "frame-benchmarking",
  "handlebars",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "sc-cli",
  "sc-client-db",
  "sc-executor",
@@ -1725,7 +1741,7 @@ version = "3.0.0"
 dependencies = [
  "frame-support",
  "frame-system",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "sp-arithmetic",
  "sp-npos-elections",
  "sp-runtime",
@@ -1742,7 +1758,7 @@ dependencies = [
  "pallet-balances",
  "pallet-indices",
  "pallet-transaction-payment",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-core",
  "sp-io",
@@ -1756,7 +1772,7 @@ dependencies = [
 name = "frame-metadata"
 version = "13.0.0"
 dependencies = [
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-core",
  "sp-std",
@@ -1773,7 +1789,7 @@ dependencies = [
  "impl-trait-for-tuples",
  "log",
  "once_cell",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "parity-util-mem",
  "paste 1.0.4",
  "pretty_assertions",
@@ -1828,7 +1844,7 @@ dependencies = [
  "frame-metadata",
  "frame-support",
  "frame-system",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "pretty_assertions",
  "rustversion",
  "serde",
@@ -1849,7 +1865,7 @@ dependencies = [
  "frame-support",
  "impl-trait-for-tuples",
  "log",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-core",
  "sp-externalities",
@@ -1867,7 +1883,7 @@ dependencies = [
  "frame-benchmarking",
  "frame-support",
  "frame-system",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-core",
  "sp-io",
@@ -1879,7 +1895,7 @@ dependencies = [
 name = "frame-system-rpc-runtime-api"
 version = "3.0.0"
 dependencies = [
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "sp-api",
 ]
 
@@ -1888,7 +1904,7 @@ name = "frame-try-runtime"
 version = "0.9.0"
 dependencies = [
  "frame-support",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "sp-api",
  "sp-runtime",
  "sp-std",
@@ -2599,7 +2615,7 @@ version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "df170efa359aebdd5cb7fe78edcc67107748e4737bdca8a8fb40d15ea7a877ed"
 dependencies = [
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
 ]
 
 [[package]]
@@ -4004,7 +4020,7 @@ dependencies = [
  "pallet-staking",
  "pallet-timestamp",
  "pallet-transaction-payment",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "parking_lot 0.11.1",
  "platforms",
  "rand 0.7.3",
@@ -4076,7 +4092,7 @@ dependencies = [
  "pallet-timestamp",
  "pallet-transaction-payment",
  "pallet-treasury",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "sc-executor",
  "sp-application-crypto",
  "sp-consensus-babe",
@@ -4098,7 +4114,7 @@ version = "0.8.0"
 dependencies = [
  "derive_more",
  "log",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "sc-cli",
  "sc-client-api",
  "sc-service",
@@ -4113,7 +4129,7 @@ name = "node-primitives"
 version = "2.0.0"
 dependencies = [
  "frame-system",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "pretty_assertions",
  "sp-application-crypto",
  "sp-core",
@@ -4221,7 +4237,7 @@ dependencies = [
  "pallet-treasury",
  "pallet-utility",
  "pallet-vesting",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-api",
  "sp-authority-discovery",
@@ -4299,7 +4315,7 @@ dependencies = [
  "pallet-timestamp",
  "pallet-transaction-payment",
  "pallet-transaction-payment-rpc-runtime-api",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-api",
  "sp-block-builder",
@@ -4338,7 +4354,7 @@ dependencies = [
  "pallet-timestamp",
  "pallet-transaction-payment",
  "pallet-treasury",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "sc-block-builder",
  "sc-cli",
  "sc-client-api",
@@ -4519,7 +4535,7 @@ dependencies = [
  "frame-support",
  "frame-system",
  "pallet-balances",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-core",
  "sp-io",
@@ -4534,7 +4550,7 @@ dependencies = [
  "frame-support",
  "frame-system",
  "pallet-balances",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-core",
  "sp-io",
@@ -4551,7 +4567,7 @@ dependencies = [
  "lazy_static",
  "pallet-session",
  "pallet-timestamp",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "parking_lot 0.11.1",
  "serde",
  "sp-application-crypto",
@@ -4569,7 +4585,7 @@ dependencies = [
  "frame-support",
  "frame-system",
  "pallet-session",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-application-crypto",
  "sp-authority-discovery",
@@ -4587,7 +4603,7 @@ dependencies = [
  "frame-support",
  "frame-system",
  "impl-trait-for-tuples",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-authorship",
  "sp-core",
@@ -4613,7 +4629,7 @@ dependencies = [
  "pallet-staking",
  "pallet-staking-reward-curve",
  "pallet-timestamp",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-application-crypto",
  "sp-consensus-babe",
@@ -4635,7 +4651,7 @@ dependencies = [
  "frame-system",
  "log",
  "pallet-transaction-payment",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-core",
  "sp-io",
@@ -4652,7 +4668,7 @@ dependencies = [
  "frame-system",
  "pallet-balances",
  "pallet-treasury",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-core",
  "sp-io",
@@ -4671,7 +4687,7 @@ dependencies = [
  "hex-literal",
  "log",
  "pallet-balances",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-core",
  "sp-io",
@@ -4694,7 +4710,7 @@ dependencies = [
  "pallet-contracts-proc-macro",
  "pallet-randomness-collective-flip",
  "pallet-timestamp",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "parity-wasm 0.41.0",
  "paste 1.0.4",
  "pretty_assertions",
@@ -4716,7 +4732,7 @@ name = "pallet-contracts-primitives"
 version = "3.0.0"
 dependencies = [
  "bitflags",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "sp-runtime",
  "sp-std",
 ]
@@ -4739,7 +4755,7 @@ dependencies = [
  "jsonrpc-derive",
  "pallet-contracts-primitives",
  "pallet-contracts-rpc-runtime-api",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "serde_json",
  "sp-api",
@@ -4754,7 +4770,7 @@ name = "pallet-contracts-rpc-runtime-api"
 version = "3.0.0"
 dependencies = [
  "pallet-contracts-primitives",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "sp-api",
  "sp-runtime",
  "sp-std",
@@ -4770,7 +4786,7 @@ dependencies = [
  "hex-literal",
  "pallet-balances",
  "pallet-scheduler",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-core",
  "sp-io",
@@ -4791,7 +4807,7 @@ dependencies = [
  "hex-literal",
  "log",
  "pallet-balances",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "parking_lot 0.11.1",
  "paste 1.0.4",
  "rand 0.7.3",
@@ -4815,7 +4831,7 @@ dependencies = [
  "frame-system",
  "hex-literal",
  "pallet-balances",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-core",
  "sp-io",
@@ -4833,7 +4849,7 @@ dependencies = [
  "hex-literal",
  "log",
  "pallet-balances",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-core",
  "sp-io",
@@ -4851,7 +4867,7 @@ dependencies = [
  "frame-support",
  "frame-system",
  "pallet-balances",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-core",
  "sp-io",
@@ -4867,7 +4883,7 @@ dependencies = [
  "frame-system",
  "lite-json",
  "log",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-core",
  "sp-io",
@@ -4882,7 +4898,7 @@ version = "2.0.1"
 dependencies = [
  "frame-support",
  "frame-system",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-core",
  "sp-io",
@@ -4899,7 +4915,7 @@ dependencies = [
  "frame-support",
  "frame-system",
  "pallet-balances",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-arithmetic",
  "sp-core",
@@ -4925,7 +4941,7 @@ dependencies = [
  "pallet-staking",
  "pallet-staking-reward-curve",
  "pallet-timestamp",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-application-crypto",
  "sp-core",
@@ -4947,7 +4963,7 @@ dependencies = [
  "frame-support",
  "frame-system",
  "pallet-balances",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-core",
  "sp-io",
@@ -4965,7 +4981,7 @@ dependencies = [
  "log",
  "pallet-authorship",
  "pallet-session",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-application-crypto",
  "sp-core",
@@ -4983,7 +4999,7 @@ dependencies = [
  "frame-support",
  "frame-system",
  "pallet-balances",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-core",
  "sp-io",
@@ -5001,7 +5017,7 @@ dependencies = [
  "frame-support-test",
  "frame-system",
  "pallet-balances",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-core",
  "sp-io",
@@ -5015,7 +5031,7 @@ version = "3.0.0"
 dependencies = [
  "frame-support",
  "frame-system",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-core",
  "sp-io",
@@ -5034,7 +5050,7 @@ dependencies = [
  "frame-system",
  "hex-literal",
  "pallet-mmr-primitives",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-core",
  "sp-io",
@@ -5050,7 +5066,7 @@ dependencies = [
  "frame-system",
  "hex-literal",
  "log",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-api",
  "sp-core",
@@ -5066,7 +5082,7 @@ dependencies = [
  "jsonrpc-core-client",
  "jsonrpc-derive",
  "pallet-mmr-primitives",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "serde_json",
  "sp-api",
@@ -5084,7 +5100,7 @@ dependencies = [
  "frame-support",
  "frame-system",
  "pallet-balances",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-core",
  "sp-io",
@@ -5099,7 +5115,7 @@ dependencies = [
  "frame-support",
  "frame-system",
  "pallet-balances",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-core",
  "sp-io",
@@ -5114,7 +5130,7 @@ dependencies = [
  "frame-support",
  "frame-system",
  "log",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-core",
  "sp-io",
@@ -5130,7 +5146,7 @@ dependencies = [
  "frame-system",
  "log",
  "pallet-balances",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-core",
  "sp-io",
@@ -5156,7 +5172,7 @@ dependencies = [
  "pallet-staking",
  "pallet-staking-reward-curve",
  "pallet-timestamp",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-core",
  "sp-io",
@@ -5174,7 +5190,7 @@ dependencies = [
  "frame-system",
  "pallet-balances",
  "pallet-utility",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-core",
  "sp-io",
@@ -5188,7 +5204,7 @@ version = "3.0.0"
 dependencies = [
  "frame-support",
  "frame-system",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "safe-mix",
  "serde",
  "sp-core",
@@ -5205,7 +5221,7 @@ dependencies = [
  "frame-support",
  "frame-system",
  "pallet-balances",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-core",
  "sp-io",
@@ -5221,7 +5237,7 @@ dependencies = [
  "frame-support",
  "frame-system",
  "log",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-core",
  "sp-io",
@@ -5237,7 +5253,7 @@ dependencies = [
  "frame-support",
  "frame-system",
  "pallet-balances",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-core",
  "sp-io",
@@ -5254,7 +5270,7 @@ dependencies = [
  "impl-trait-for-tuples",
  "lazy_static",
  "pallet-timestamp",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-application-crypto",
  "sp-core",
@@ -5279,7 +5295,7 @@ dependencies = [
  "pallet-staking",
  "pallet-staking-reward-curve",
  "pallet-timestamp",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "rand 0.7.3",
  "serde",
  "sp-core",
@@ -5297,7 +5313,7 @@ dependencies = [
  "frame-support-test",
  "frame-system",
  "pallet-balances",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "rand_chacha 0.2.2",
  "serde",
  "sp-core",
@@ -5321,7 +5337,7 @@ dependencies = [
  "pallet-session",
  "pallet-staking-reward-curve",
  "pallet-timestamp",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "parking_lot 0.11.1",
  "paste 1.0.4",
  "rand_chacha 0.2.2",
@@ -5364,7 +5380,7 @@ version = "3.0.0"
 dependencies = [
  "frame-support",
  "frame-system",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-core",
  "sp-io",
@@ -5379,7 +5395,7 @@ dependencies = [
  "frame-benchmarking",
  "frame-support",
  "frame-system",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-core",
  "sp-io",
@@ -5395,7 +5411,7 @@ dependencies = [
  "frame-system",
  "impl-trait-for-tuples",
  "log",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-core",
  "sp-inherents",
@@ -5414,7 +5430,7 @@ dependencies = [
  "frame-system",
  "pallet-balances",
  "pallet-treasury",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-core",
  "sp-io",
@@ -5430,7 +5446,7 @@ dependencies = [
  "frame-support",
  "frame-system",
  "pallet-balances",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "serde_json",
  "smallvec 1.6.1",
@@ -5449,7 +5465,7 @@ dependencies = [
  "jsonrpc-core-client",
  "jsonrpc-derive",
  "pallet-transaction-payment-rpc-runtime-api",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "sp-api",
  "sp-blockchain",
  "sp-core",
@@ -5462,7 +5478,7 @@ name = "pallet-transaction-payment-rpc-runtime-api"
 version = "3.0.0"
 dependencies = [
  "pallet-transaction-payment",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "sp-api",
  "sp-runtime",
 ]
@@ -5476,7 +5492,7 @@ dependencies = [
  "frame-system",
  "impl-trait-for-tuples",
  "pallet-balances",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-core",
  "sp-io",
@@ -5493,7 +5509,7 @@ dependencies = [
  "frame-support",
  "frame-system",
  "pallet-balances",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-core",
  "sp-io",
@@ -5511,7 +5527,7 @@ dependencies = [
  "frame-system",
  "hex-literal",
  "pallet-balances",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-core",
  "sp-io",
@@ -5555,6 +5571,18 @@ dependencies = [
  "url 2.2.1",
 ]
 
+[[package]]
+name = "parity-scale-codec"
+version = "1.3.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a4b26b16c7687c3075982af47719e481815df30bc544f7a6690763a25ca16e9d"
+dependencies = [
+ "arrayvec 0.5.2",
+ "bitvec 0.17.4",
+ "byte-slice-cast 0.3.5",
+ "serde",
+]
+
 [[package]]
 name = "parity-scale-codec"
 version = "2.0.1"
@@ -5562,8 +5590,8 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0cd3dab59b5cf4bc81069ade0fc470341a1ef3ad5fa73e5a8943bed2ec12b2e8"
 dependencies = [
  "arrayvec 0.5.2",
- "bitvec",
- "byte-slice-cast",
+ "bitvec 0.20.2",
+ "byte-slice-cast 1.0.0",
  "parity-scale-codec-derive",
  "serde",
 ]
@@ -6258,6 +6286,12 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "radium"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "def50a86306165861203e7f84ecffbbdfdea79f0e51039b33de1e952358c47ac"
+
 [[package]]
 name = "radium"
 version = "0.6.2"
@@ -6570,7 +6604,7 @@ dependencies = [
  "jsonrpsee-proc-macros",
  "jsonrpsee-types",
  "log",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "sp-core",
  "sp-io",
  "sp-runtime",
@@ -6765,7 +6799,7 @@ dependencies = [
  "futures-timer 3.0.2",
  "libp2p",
  "log",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "prost",
  "prost-build",
  "quickcheck",
@@ -6792,7 +6826,7 @@ dependencies = [
  "futures 0.3.13",
  "futures-timer 3.0.2",
  "log",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "parking_lot 0.11.1",
  "sc-block-builder",
  "sc-client-api",
@@ -6814,7 +6848,7 @@ dependencies = [
 name = "sc-block-builder"
 version = "0.9.0"
 dependencies = [
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "sc-client-api",
  "sp-api",
  "sp-block-builder",
@@ -6832,7 +6866,7 @@ name = "sc-chain-spec"
 version = "3.0.0"
 dependencies = [
  "impl-trait-for-tuples",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "sc-chain-spec-derive",
  "sc-consensus-babe",
  "sc-consensus-epochs",
@@ -6868,7 +6902,7 @@ dependencies = [
  "libp2p",
  "log",
  "names",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "rand 0.7.3",
  "regex",
  "rpassword",
@@ -6907,7 +6941,7 @@ dependencies = [
  "kvdb-memorydb",
  "lazy_static",
  "log",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "parking_lot 0.11.1",
  "sc-executor",
  "sp-api",
@@ -6944,7 +6978,7 @@ dependencies = [
  "linked-hash-map",
  "log",
  "parity-db",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "parity-util-mem",
  "parking_lot 0.11.1",
  "quickcheck",
@@ -6985,7 +7019,7 @@ dependencies = [
  "futures-timer 3.0.2",
  "getrandom 0.2.2",
  "log",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "parking_lot 0.11.1",
  "sc-block-builder",
  "sc-client-api",
@@ -7030,7 +7064,7 @@ dependencies = [
  "num-bigint",
  "num-rational",
  "num-traits",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "parking_lot 0.11.1",
  "pdqselect",
  "rand 0.7.3",
@@ -7106,7 +7140,7 @@ name = "sc-consensus-epochs"
 version = "0.9.0"
 dependencies = [
  "fork-tree",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "parking_lot 0.11.1",
  "sc-client-api",
  "sp-blockchain",
@@ -7124,7 +7158,7 @@ dependencies = [
  "jsonrpc-core-client",
  "jsonrpc-derive",
  "log",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "parking_lot 0.11.1",
  "sc-basic-authorship",
  "sc-client-api",
@@ -7159,7 +7193,7 @@ dependencies = [
  "futures 0.3.13",
  "futures-timer 3.0.2",
  "log",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "parking_lot 0.11.1",
  "sc-client-api",
  "sp-api",
@@ -7181,7 +7215,7 @@ dependencies = [
  "futures 0.3.13",
  "futures-timer 3.0.2",
  "log",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "parking_lot 0.11.1",
  "sc-client-api",
  "sc-telemetry",
@@ -7224,7 +7258,7 @@ dependencies = [
  "lazy_static",
  "libsecp256k1",
  "log",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "parity-wasm 0.41.0",
  "parking_lot 0.11.1",
  "paste 1.0.4",
@@ -7259,7 +7293,7 @@ name = "sc-executor-common"
 version = "0.9.0"
 dependencies = [
  "derive_more",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "parity-wasm 0.41.0",
  "sp-allocator",
  "sp-core",
@@ -7274,7 +7308,7 @@ name = "sc-executor-wasmi"
 version = "0.9.0"
 dependencies = [
  "log",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "sc-executor-common",
  "sp-allocator",
  "sp-core",
@@ -7289,7 +7323,7 @@ version = "0.9.0"
 dependencies = [
  "assert_matches",
  "log",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "parity-wasm 0.41.0",
  "pwasm-utils 0.14.0",
  "sc-executor-common",
@@ -7314,7 +7348,7 @@ dependencies = [
  "futures-timer 3.0.2",
  "linked-hash-map",
  "log",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "parking_lot 0.11.1",
  "pin-project 1.0.5",
  "rand 0.7.3",
@@ -7361,7 +7395,7 @@ dependencies = [
  "jsonrpc-pubsub",
  "lazy_static",
  "log",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "sc-block-builder",
  "sc-client-api",
  "sc-finality-grandpa",
@@ -7387,7 +7421,7 @@ dependencies = [
  "futures 0.3.13",
  "log",
  "num-traits",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "parking_lot 0.11.1",
  "prost",
  "rand 0.8.3",
@@ -7447,7 +7481,7 @@ version = "3.0.0"
 dependencies = [
  "hash-db",
  "lazy_static",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "parking_lot 0.11.1",
  "sc-client-api",
  "sc-executor",
@@ -7486,7 +7520,7 @@ dependencies = [
  "log",
  "lru",
  "nohash-hasher",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "parking_lot 0.11.1",
  "pin-project 1.0.5",
  "prost",
@@ -7580,7 +7614,7 @@ dependencies = [
  "lazy_static",
  "log",
  "num_cpus",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "parking_lot 0.11.1",
  "rand 0.7.3",
  "sc-block-builder",
@@ -7635,7 +7669,7 @@ dependencies = [
  "jsonrpc-pubsub",
  "lazy_static",
  "log",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "parking_lot 0.11.1",
  "sc-block-builder",
  "sc-cli",
@@ -7676,7 +7710,7 @@ dependencies = [
  "jsonrpc-derive",
  "jsonrpc-pubsub",
  "log",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "parking_lot 0.11.1",
  "serde",
  "serde_json",
@@ -7734,7 +7768,7 @@ dependencies = [
  "jsonrpc-pubsub",
  "lazy_static",
  "log",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "parity-util-mem",
  "parking_lot 0.11.1",
  "pin-project 1.0.5",
@@ -7797,7 +7831,7 @@ dependencies = [
  "futures 0.3.13",
  "hex-literal",
  "log",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "parking_lot 0.11.1",
  "sc-block-builder",
  "sc-client-api",
@@ -7829,7 +7863,7 @@ name = "sc-state-db"
 version = "0.9.0"
 dependencies = [
  "log",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "parity-util-mem",
  "parity-util-mem-derive",
  "parking_lot 0.11.1",
@@ -7922,7 +7956,7 @@ dependencies = [
  "futures 0.3.13",
  "linked-hash-map",
  "log",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "parity-util-mem",
  "parking_lot 0.11.1",
  "retain_mut",
@@ -7947,7 +7981,7 @@ dependencies = [
  "hex",
  "intervalier",
  "log",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "parity-util-mem",
  "parking_lot 0.11.1",
  "sc-block-builder",
@@ -8365,7 +8399,7 @@ version = "3.0.0"
 dependencies = [
  "hash-db",
  "log",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "sp-api-proc-macro",
  "sp-core",
  "sp-runtime",
@@ -8393,7 +8427,7 @@ version = "2.0.1"
 dependencies = [
  "criterion",
  "log",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "rustversion",
  "sc-block-builder",
  "sp-api",
@@ -8412,7 +8446,7 @@ dependencies = [
 name = "sp-application-crypto"
 version = "3.0.0"
 dependencies = [
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-core",
  "sp-io",
@@ -8438,7 +8472,7 @@ dependencies = [
  "criterion",
  "integer-sqrt",
  "num-traits",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "primitive-types",
  "rand 0.7.3",
  "serde",
@@ -8462,7 +8496,7 @@ dependencies = [
 name = "sp-authority-discovery"
 version = "3.0.0"
 dependencies = [
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "sp-api",
  "sp-application-crypto",
  "sp-runtime",
@@ -8473,7 +8507,7 @@ dependencies = [
 name = "sp-authorship"
 version = "3.0.0"
 dependencies = [
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "sp-inherents",
  "sp-runtime",
  "sp-std",
@@ -8483,7 +8517,7 @@ dependencies = [
 name = "sp-block-builder"
 version = "3.0.0"
 dependencies = [
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "sp-api",
  "sp-inherents",
  "sp-runtime",
@@ -8497,7 +8531,7 @@ dependencies = [
  "futures 0.3.13",
  "log",
  "lru",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "parking_lot 0.11.1",
  "sp-api",
  "sp-consensus",
@@ -8523,7 +8557,7 @@ dependencies = [
  "futures-timer 3.0.2",
  "libp2p",
  "log",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "parking_lot 0.11.1",
  "serde",
  "sp-api",
@@ -8545,7 +8579,7 @@ dependencies = [
 name = "sp-consensus-aura"
 version = "0.9.0"
 dependencies = [
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "sp-api",
  "sp-application-crypto",
  "sp-consensus",
@@ -8561,7 +8595,7 @@ name = "sp-consensus-babe"
 version = "0.9.0"
 dependencies = [
  "merlin",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-api",
  "sp-application-crypto",
@@ -8580,7 +8614,7 @@ dependencies = [
 name = "sp-consensus-pow"
 version = "0.9.0"
 dependencies = [
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "sp-api",
  "sp-core",
  "sp-runtime",
@@ -8591,7 +8625,7 @@ dependencies = [
 name = "sp-consensus-slots"
 version = "0.9.0"
 dependencies = [
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "sp-arithmetic",
  "sp-runtime",
 ]
@@ -8600,7 +8634,7 @@ dependencies = [
 name = "sp-consensus-vrf"
 version = "0.9.0"
 dependencies = [
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "schnorrkel",
  "sp-core",
  "sp-runtime",
@@ -8628,7 +8662,7 @@ dependencies = [
  "log",
  "merlin",
  "num-traits",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "parity-util-mem",
  "parking_lot 0.11.1",
  "pretty_assertions",
@@ -8678,7 +8712,7 @@ name = "sp-externalities"
 version = "0.9.0"
 dependencies = [
  "environmental",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "sp-std",
  "sp-storage",
 ]
@@ -8689,7 +8723,7 @@ version = "3.0.0"
 dependencies = [
  "finality-grandpa",
  "log",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-api",
  "sp-application-crypto",
@@ -8703,7 +8737,7 @@ dependencies = [
 name = "sp-inherents"
 version = "3.0.0"
 dependencies = [
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "parking_lot 0.11.1",
  "sp-core",
  "sp-std",
@@ -8718,7 +8752,7 @@ dependencies = [
  "hash-db",
  "libsecp256k1",
  "log",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "parking_lot 0.11.1",
  "sp-core",
  "sp-externalities",
@@ -8751,7 +8785,7 @@ dependencies = [
  "derive_more",
  "futures 0.3.13",
  "merlin",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "parking_lot 0.11.1",
  "rand 0.7.3",
  "rand_chacha 0.2.2",
@@ -8765,7 +8799,7 @@ dependencies = [
 name = "sp-npos-elections"
 version = "3.0.0"
 dependencies = [
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "rand 0.7.3",
  "serde",
  "sp-arithmetic",
@@ -8791,7 +8825,7 @@ name = "sp-npos-elections-fuzzer"
 version = "2.0.0-alpha.5"
 dependencies = [
  "honggfuzz",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "rand 0.7.3",
  "sp-arithmetic",
  "sp-npos-elections",
@@ -8834,7 +8868,7 @@ dependencies = [
  "hash256-std-hasher",
  "impl-trait-for-tuples",
  "log",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "parity-util-mem",
  "paste 1.0.4",
  "rand 0.7.3",
@@ -8856,7 +8890,7 @@ name = "sp-runtime-interface"
 version = "3.0.0"
 dependencies = [
  "impl-trait-for-tuples",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "primitive-types",
  "rustversion",
  "sp-core",
@@ -8927,7 +8961,7 @@ name = "sp-sandbox"
 version = "0.9.0"
 dependencies = [
  "assert_matches",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "sp-core",
  "sp-io",
  "sp-std",
@@ -8948,7 +8982,7 @@ dependencies = [
 name = "sp-session"
 version = "3.0.0"
 dependencies = [
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "sp-api",
  "sp-core",
  "sp-runtime",
@@ -8960,7 +8994,7 @@ dependencies = [
 name = "sp-staking"
 version = "3.0.0"
 dependencies = [
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "sp-runtime",
  "sp-std",
 ]
@@ -8973,7 +9007,7 @@ dependencies = [
  "hex-literal",
  "log",
  "num-traits",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "parking_lot 0.11.1",
  "pretty_assertions",
  "rand 0.7.3",
@@ -8998,7 +9032,7 @@ name = "sp-storage"
 version = "3.0.0"
 dependencies = [
  "impl-serde",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "ref-cast",
  "serde",
  "sp-debug-derive",
@@ -9010,7 +9044,7 @@ name = "sp-tasks"
 version = "3.0.0"
 dependencies = [
  "log",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "sp-core",
  "sp-externalities",
  "sp-io",
@@ -9022,7 +9056,7 @@ dependencies = [
 name = "sp-test-primitives"
 version = "2.0.0"
 dependencies = [
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "parity-util-mem",
  "serde",
  "sp-application-crypto",
@@ -9034,7 +9068,7 @@ dependencies = [
 name = "sp-timestamp"
 version = "3.0.0"
 dependencies = [
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "sp-api",
  "sp-inherents",
  "sp-runtime",
@@ -9047,7 +9081,7 @@ name = "sp-tracing"
 version = "3.0.0"
 dependencies = [
  "log",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "sp-std",
  "tracing",
  "tracing-core",
@@ -9061,7 +9095,7 @@ dependencies = [
  "derive_more",
  "futures 0.3.13",
  "log",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-api",
  "sp-blockchain",
@@ -9077,7 +9111,7 @@ dependencies = [
  "hash-db",
  "hex-literal",
  "memory-db",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "sp-core",
  "sp-runtime",
  "sp-std",
@@ -9103,7 +9137,7 @@ name = "sp-version"
 version = "3.0.0"
 dependencies = [
  "impl-serde",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "serde",
  "sp-runtime",
  "sp-std",
@@ -9114,7 +9148,7 @@ name = "sp-wasm-interface"
 version = "3.0.0"
 dependencies = [
  "impl-trait-for-tuples",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "sp-std",
  "wasmi",
 ]
@@ -9289,7 +9323,7 @@ dependencies = [
  "futures 0.3.13",
  "jsonrpc-client-transports",
  "jsonrpc-core",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "sc-rpc-api",
  "serde",
  "sp-storage",
@@ -9306,7 +9340,7 @@ dependencies = [
  "jsonrpc-core-client",
  "jsonrpc-derive",
  "log",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "sc-client-api",
  "sc-rpc-api",
  "sc-transaction-pool",
@@ -9342,7 +9376,7 @@ dependencies = [
  "futures 0.3.13",
  "hash-db",
  "hex",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "sc-client-api",
  "sc-client-db",
  "sc-consensus",
@@ -9373,7 +9407,7 @@ dependencies = [
  "memory-db",
  "pallet-babe",
  "pallet-timestamp",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "parity-util-mem",
  "sc-block-builder",
  "sc-executor",
@@ -9409,7 +9443,7 @@ name = "substrate-test-runtime-client"
 version = "2.0.0"
 dependencies = [
  "futures 0.3.13",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "sc-block-builder",
  "sc-client-api",
  "sc-consensus",
@@ -9430,7 +9464,7 @@ version = "2.0.0"
 dependencies = [
  "derive_more",
  "futures 0.3.13",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "parking_lot 0.11.1",
  "sc-transaction-graph",
  "sp-blockchain",
@@ -9558,6 +9592,88 @@ dependencies = [
  "winapi-util",
 ]
 
+[[package]]
+name = "test-runner"
+version = "0.9.0"
+dependencies = [
+ "env_logger 0.7.1",
+ "frame-system",
+ "futures 0.1.31",
+ "futures 0.3.13",
+ "jsonrpc-core",
+ "libp2p",
+ "log",
+ "node-cli",
+ "parity-scale-codec 1.3.7",
+ "rand 0.7.3",
+ "sc-basic-authorship",
+ "sc-cli",
+ "sc-client-api",
+ "sc-consensus-babe",
+ "sc-consensus-manual-seal",
+ "sc-executor",
+ "sc-finality-grandpa",
+ "sc-informant",
+ "sc-network",
+ "sc-rpc",
+ "sc-rpc-server",
+ "sc-service",
+ "sc-transaction-graph",
+ "sc-transaction-pool",
+ "sp-api",
+ "sp-block-builder",
+ "sp-blockchain",
+ "sp-consensus",
+ "sp-consensus-babe",
+ "sp-core",
+ "sp-externalities",
+ "sp-inherents",
+ "sp-io",
+ "sp-keyring",
+ "sp-keystore",
+ "sp-offchain",
+ "sp-runtime",
+ "sp-runtime-interface",
+ "sp-session",
+ "sp-state-machine",
+ "sp-transaction-pool",
+ "sp-wasm-interface",
+ "tokio 0.2.25",
+]
+
+[[package]]
+name = "test-runner-example"
+version = "0.1.0"
+dependencies = [
+ "frame-benchmarking",
+ "frame-support",
+ "frame-system",
+ "log",
+ "node-cli",
+ "node-primitives",
+ "node-runtime",
+ "pallet-balances",
+ "pallet-sudo",
+ "pallet-transaction-payment",
+ "rand 0.8.3",
+ "sc-client-api",
+ "sc-consensus",
+ "sc-consensus-babe",
+ "sc-consensus-manual-seal",
+ "sc-executor",
+ "sc-finality-grandpa",
+ "sc-informant",
+ "sc-network",
+ "sc-service",
+ "sp-api",
+ "sp-consensus-babe",
+ "sp-inherents",
+ "sp-keyring",
+ "sp-keystore",
+ "sp-runtime",
+ "test-runner",
+]
+
 [[package]]
 name = "textwrap"
 version = "0.11.0"
@@ -9706,6 +9822,7 @@ dependencies = [
  "libc",
  "memchr",
  "mio",
+ "mio-named-pipes",
  "mio-uds",
  "num_cpus",
  "pin-project-lite 0.1.12",
@@ -10060,7 +10177,7 @@ dependencies = [
  "hash-db",
  "keccak-hasher",
  "memory-db",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "trie-db",
  "trie-root",
  "trie-standardmap",
@@ -10110,7 +10227,7 @@ version = "0.9.0"
 dependencies = [
  "frame-try-runtime",
  "log",
- "parity-scale-codec",
+ "parity-scale-codec 2.0.1",
  "remote-externalities",
  "sc-cli",
  "sc-client-api",
diff --git a/Cargo.toml b/Cargo.toml
index 9675070a516fb..57052a8d38e05 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,6 +6,7 @@ members = [
 	"bin/node/bench",
 	"bin/node/browser-testing",
 	"bin/node/cli",
+	"bin/node/test-runner-example",
 	"bin/node/executor",
 	"bin/node/primitives",
 	"bin/node/rpc",
@@ -184,6 +185,7 @@ members = [
 	"test-utils/runtime",
 	"test-utils/runtime/client",
 	"test-utils/runtime/transaction-pool",
+	"test-utils/test-runner",
 	"test-utils/test-crate",
 	"utils/browser",
 	"utils/build-script-utils",
diff --git a/bin/node/test-runner-example/Cargo.toml b/bin/node/test-runner-example/Cargo.toml
new file mode 100644
index 0000000000000..f94575e8e621b
--- /dev/null
+++ b/bin/node/test-runner-example/Cargo.toml
@@ -0,0 +1,40 @@
+[package]
+name = "test-runner-example"
+version = "0.1.0"
+authors = ["Parity Technologies <admin@parity.io>"]
+edition = "2018"
+publish = false
+
+[dependencies]
+test-runner = { path = "../../../test-utils/test-runner", version = "0.9.0" }
+
+frame-system = { version = "3.0.0", path = "../../../frame/system" }
+frame-support = { path = "../../../frame/support", version = "3.0.0" }
+frame-benchmarking = { path = "../../../frame/benchmarking", version = "3.0.0" }
+pallet-balances = { path = "../../../frame/balances", version = "3.0.0" }
+pallet-sudo = { path = "../../../frame/sudo", version = "3.0.0" }
+pallet-transaction-payment = { version = "3.0.0", path = "../../../frame/transaction-payment" }
+
+node-runtime = { path = "../runtime", version = "2.0.1" }
+node-primitives = { version = "2.0.0", path = "../primitives" }
+node-cli = { path = "../cli", version = "2.0.0" }
+
+grandpa = { version = "0.9.0", package = "sc-finality-grandpa", path = "../../../client/finality-grandpa" }
+sp-consensus-babe = { version = "0.9.0", path = "../../../primitives/consensus/babe" }
+sc-consensus-babe = { version = "0.9.0", path = "../../../client/consensus/babe" }
+sc-consensus-manual-seal = { version = "0.9.0", path = "../../../client/consensus/manual-seal" }
+sc-service = { version = "0.9.0", default-features = false, path = "../../../client/service" }
+sc-executor = { version = "0.9.0", path = "../../../client/executor" }
+sc-client-api = { version = "3.0.0", path = "../../../client/api" }
+sc-network = { version = "0.9.0", path = "../../../client/network" }
+sc-informant = { version = "0.9.0", path = "../../../client/informant" }
+sc-consensus = { version = "0.9.0", path = "../../../client/consensus/common" }
+
+sp-runtime = { path = "../../../primitives/runtime", version = "3.0.0" }
+sp-keyring = { version = "3.0.0", path = "../../../primitives/keyring" }
+sp-api = { version = "3.0.0",  path = "../../../primitives/api" }
+sp-inherents = { version = "3.0.0", path = "../../../primitives/inherents" }
+sp-keystore = { version = "0.9.0", path = "../../../primitives/keystore" }
+
+rand = "0.8.3"
+log = "0.4.14"
diff --git a/bin/node/test-runner-example/src/lib.rs b/bin/node/test-runner-example/src/lib.rs
new file mode 100644
index 0000000000000..22cfffa7f23a7
--- /dev/null
+++ b/bin/node/test-runner-example/src/lib.rs
@@ -0,0 +1,202 @@
+// This file is part of Substrate.
+
+// Copyright (C) 2021 Parity Technologies (UK) Ltd.
+// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+//! Basic example of end to end runtime tests.
+
+use test_runner::{Node, ChainInfo, SignatureVerificationOverride};
+use grandpa::GrandpaBlockImport;
+use sc_service::{TFullBackend, TFullClient, Configuration, TaskManager, new_full_parts};
+use std::sync::Arc;
+use sp_inherents::InherentDataProviders;
+use sc_consensus_babe::BabeBlockImport;
+use sp_keystore::SyncCryptoStorePtr;
+use sp_keyring::sr25519::Keyring::Alice;
+use sp_consensus_babe::AuthorityId;
+use sc_consensus_manual_seal::{ConsensusDataProvider, consensus::babe::BabeConsensusDataProvider};
+use sp_runtime::{traits::IdentifyAccount, MultiSigner, generic::Era};
+
+type BlockImport<B, BE, C, SC> = BabeBlockImport<B, C, GrandpaBlockImport<BE, B, C, SC>>;
+
+sc_executor::native_executor_instance!(
+	pub Executor,
+	node_runtime::api::dispatch,
+	node_runtime::native_version,
+	(
+		frame_benchmarking::benchmarking::HostFunctions,
+		SignatureVerificationOverride,
+	)
+);
+
+/// ChainInfo implementation.
+struct NodeTemplateChainInfo;
+
+impl ChainInfo for NodeTemplateChainInfo {
+	type Block = node_primitives::Block;
+	type Executor = Executor;
+	type Runtime = node_runtime::Runtime;
+	type RuntimeApi = node_runtime::RuntimeApi;
+	type SelectChain = sc_consensus::LongestChain<TFullBackend<Self::Block>, Self::Block>;
+	type BlockImport = BlockImport<
+		Self::Block,
+		TFullBackend<Self::Block>,
+		TFullClient<Self::Block, Self::RuntimeApi, Self::Executor>,
+		Self::SelectChain,
+	>;
+	type SignedExtras = node_runtime::SignedExtra;
+
+	fn signed_extras(from: <Self::Runtime as frame_system::Config>::AccountId) -> Self::SignedExtras {
+		(
+			frame_system::CheckSpecVersion::<Self::Runtime>::new(),
+			frame_system::CheckTxVersion::<Self::Runtime>::new(),
+			frame_system::CheckGenesis::<Self::Runtime>::new(),
+			frame_system::CheckMortality::<Self::Runtime>::from(Era::Immortal),
+			frame_system::CheckNonce::<Self::Runtime>::from(frame_system::Pallet::<Self::Runtime>::account_nonce(from)),
+			frame_system::CheckWeight::<Self::Runtime>::new(),
+			pallet_transaction_payment::ChargeTransactionPayment::<Self::Runtime>::from(0),
+		)
+	}
+
+	fn create_client_parts(
+		config: &Configuration,
+	) -> Result<
+		(
+			Arc<TFullClient<Self::Block, Self::RuntimeApi, Self::Executor>>,
+			Arc<TFullBackend<Self::Block>>,
+			SyncCryptoStorePtr,
+			TaskManager,
+			InherentDataProviders,
+			Option<
+				Box<
+					dyn ConsensusDataProvider<
+						Self::Block,
+						Transaction = sp_api::TransactionFor<
+							TFullClient<Self::Block, Self::RuntimeApi, Self::Executor>,
+							Self::Block,
+						>,
+					>,
+				>,
+			>,
+			Self::SelectChain,
+			Self::BlockImport,
+		),
+		sc_service::Error,
+	> {
+		let (client, backend, keystore, task_manager) =
+			new_full_parts::<Self::Block, Self::RuntimeApi, Self::Executor>(config, None)?;
+		let client = Arc::new(client);
+
+		let inherent_providers = InherentDataProviders::new();
+		let select_chain = sc_consensus::LongestChain::new(backend.clone());
+
+		let (grandpa_block_import, ..) =
+			grandpa::block_import(
+				client.clone(),
+				&(client.clone() as Arc<_>),
+				select_chain.clone(),
+				None
+			)?;
+
+		let (block_import, babe_link) = sc_consensus_babe::block_import(
+			sc_consensus_babe::Config::get_or_compute(&*client)?,
+			grandpa_block_import,
+			client.clone(),
+		)?;
+
+		let consensus_data_provider = BabeConsensusDataProvider::new(
+			client.clone(),
+			keystore.sync_keystore(),
+			&inherent_providers,
+			babe_link.epoch_changes().clone(),
+			vec![(AuthorityId::from(Alice.public()), 1000)],
+		)
+			.expect("failed to create ConsensusDataProvider");
+
+		Ok((
+			client,
+			backend,
+			keystore.sync_keystore(),
+			task_manager,
+			inherent_providers,
+			Some(Box::new(consensus_data_provider)),
+			select_chain,
+			block_import,
+		))
+	}
+
+	fn dispatch_with_root(call: <Self::Runtime as frame_system::Config>::Call, node: &mut Node<Self>) {
+		let alice = MultiSigner::from(Alice.public()).into_account();
+		let call = pallet_sudo::Call::sudo(Box::new(call));
+		node.submit_extrinsic(call, alice);
+		node.seal_blocks(1);
+	}
+}
+
+#[cfg(test)]
+mod tests {
+	use super::*;
+	use test_runner::NodeConfig;
+	use log::LevelFilter;
+	use sc_client_api::execution_extensions::ExecutionStrategies;
+	use node_cli::chain_spec::development_config;
+
+	#[test]
+	fn test_runner() {
+		let config = NodeConfig {
+			execution_strategies: ExecutionStrategies {
+				syncing: sc_client_api::ExecutionStrategy::AlwaysWasm,
+				importing: sc_client_api::ExecutionStrategy::AlwaysWasm,
+				block_construction: sc_client_api::ExecutionStrategy::AlwaysWasm,
+				offchain_worker: sc_client_api::ExecutionStrategy::AlwaysWasm,
+				other: sc_client_api::ExecutionStrategy::AlwaysWasm,
+			},
+			chain_spec: Box::new(development_config()),
+			log_targets: vec![
+				("yamux", LevelFilter::Off),
+				("multistream_select", LevelFilter::Off),
+				("libp2p", LevelFilter::Off),
+				("jsonrpc_client_transports", LevelFilter::Off),
+				("sc_network", LevelFilter::Off),
+				("tokio_reactor", LevelFilter::Off),
+				("parity-db", LevelFilter::Off),
+				("sub-libp2p", LevelFilter::Off),
+				("sync", LevelFilter::Off),
+				("peerset", LevelFilter::Off),
+				("ws", LevelFilter::Off),
+				("sc_network", LevelFilter::Off),
+				("sc_service", LevelFilter::Off),
+				("sc_basic_authorship", LevelFilter::Off),
+				("telemetry-logger", LevelFilter::Off),
+				("sc_peerset", LevelFilter::Off),
+				("rpc", LevelFilter::Off),
+				("runtime", LevelFilter::Trace),
+				("babe", LevelFilter::Debug)
+			],
+		};
+		let mut node = Node::<NodeTemplateChainInfo>::new(config).unwrap();
+		// seals blocks
+		node.seal_blocks(1);
+		// submit extrinsics
+		let alice = MultiSigner::from(Alice.public()).into_account();
+		node.submit_extrinsic(frame_system::Call::remark((b"hello world").to_vec()), alice);
+
+		// look ma, I can read state.
+		let _events = node.with_state(|| frame_system::Pallet::<node_runtime::Runtime>::events());
+		// get access to the underlying client.
+		let _client = node.client();
+	}
+}
diff --git a/client/executor/src/native_executor.rs b/client/executor/src/native_executor.rs
index 42a7950593ccf..6df651e1b776c 100644
--- a/client/executor/src/native_executor.rs
+++ b/client/executor/src/native_executor.rs
@@ -274,10 +274,20 @@ impl<D: NativeExecutionDispatch> NativeExecutor<D> {
 		default_heap_pages: Option<u64>,
 		max_runtime_instances: usize,
 	) -> Self {
-		let mut host_functions = D::ExtendHostFunctions::host_functions();
+		let extended =  D::ExtendHostFunctions::host_functions();
+		let mut host_functions = sp_io::SubstrateHostFunctions::host_functions()
+			.into_iter()
+			// filter out any host function overrides provided.
+			.filter(|host_fn| {
+				extended.iter()
+					.find(|ext_host_fn| host_fn.name() == ext_host_fn.name())
+					.is_none()
+			})
+			.collect::<Vec<_>>();
+
 
 		// Add the custom host functions provided by the user.
-		host_functions.extend(sp_io::SubstrateHostFunctions::host_functions());
+		host_functions.extend(extended);
 		let wasm_executor = WasmExecutor::new(
 			fallback_method,
 			default_heap_pages,
diff --git a/frame/babe/src/tests.rs b/frame/babe/src/tests.rs
index e9966ddb75dd0..6aa80e9697339 100644
--- a/frame/babe/src/tests.rs
+++ b/frame/babe/src/tests.rs
@@ -356,7 +356,6 @@ fn can_fetch_current_and_next_epoch_data() {
 			Babe::current_epoch().authorities,
 			Babe::next_epoch().authorities,
 		);
-
 		// 1 era = 3 epochs
 		// 1 epoch = 3 slots
 		// Eras start from 0.
diff --git a/test-utils/test-runner/Cargo.toml b/test-utils/test-runner/Cargo.toml
new file mode 100644
index 0000000000000..cac699854f828
--- /dev/null
+++ b/test-utils/test-runner/Cargo.toml
@@ -0,0 +1,61 @@
+[package]
+name = "test-runner"
+version = "0.9.0"
+authors = ["Parity Technologies <admin@parity.io>"]
+edition = "2018"
+publish = false
+
+[dependencies]
+# client deps
+sc-executor = { version = "0.9.0", path = "../../client/executor" }
+sc-service = { version = "0.9.0", path = "../../client/service" }
+sc-informant = { version = "0.9.0", path = "../../client/informant" }
+sc-network = { version = "0.9.0", path = "../../client/network" }
+sc-cli = { version = "0.9.0", path = "../../client/cli" }
+sc-basic-authorship = { version = "0.9.0", path = "../../client/basic-authorship" }
+sc-rpc = { version = "3.0.0", path = "../../client/rpc" }
+sc-transaction-pool = { version = "3.0.0", path = "../../client/transaction-pool" }
+sc-transaction-graph = { version = "3.0.0", path = "../../client/transaction-pool/graph" }
+sc-client-api = { version = "3.0.0", path = "../../client/api" }
+sc-rpc-server = { version = "3.0.0", path = "../../client/rpc-servers" }
+manual-seal = { package = "sc-consensus-manual-seal", version = "0.9.0", path = "../../client/consensus/manual-seal" }
+
+# primitive deps
+sp-core = { version = "3.0.0", path = "../../primitives/core" }
+sp-blockchain = { version = "3.0.0", path = "../../primitives/blockchain" }
+sp-block-builder = { version = "3.0.0", path = "../../primitives/block-builder" }
+sp-api = { version = "3.0.0", path = "../../primitives/api" }
+sp-io = { version = "3.0.0", path = "../../primitives/io" }
+sp-transaction-pool = { version = "3.0.0", path = "../../primitives/transaction-pool" }
+sp-consensus = { version = "0.9.0", path = "../../primitives/consensus/common" }
+sp-keystore = { version = "0.9.0", path = "../../primitives/keystore" }
+sp-runtime = { version = "3.0.0", path = "../../primitives/runtime" }
+sp-session = { version = "3.0.0", path = "../../primitives/session" }
+sp-offchain = { version = "3.0.0", path = "../../primitives/offchain" }
+sp-inherents = { version = "3.0.0", path = "../../primitives/inherents" }
+sp-keyring = { version = "3.0.0", path = "../../primitives/keyring" }
+
+sp-externalities = { version = "0.9.0", path = "../../primitives/externalities" }
+sp-state-machine = { version = "0.9.0", path = "../../primitives/state-machine" }
+sp-wasm-interface = { version = "3.0.0", path = "../../primitives/wasm-interface" }
+sp-runtime-interface = { version = "3.0.0", path = "../../primitives/runtime-interface" }
+
+# pallets
+frame-system = { version = "3.0.0", path = "../../frame/system" }
+
+parity-scale-codec = "1.3.1"
+env_logger = "0.7.1"
+log = "0.4.8"
+futures01 = { package = "futures", version = "0.1.29" }
+futures = { package = "futures", version = "0.3", features = ["compat"] }
+rand = "0.7"
+tokio = { version = "0.2", features = ["full"] }
+libp2p = "0.35.1"
+
+# Calling RPC
+jsonrpc-core = "15.1"
+[dev-dependencies]
+sc-finality-grandpa = { version = "0.9.0", path = "../../client/finality-grandpa" }
+sc-consensus-babe = { version = "0.9.0", path = "../../client/consensus/babe" }
+sp-consensus-babe = { version = "0.9.0", path = "../../primitives/consensus/babe" }
+node-cli = { version = "2.0.0", path = "../../bin/node/cli" }
\ No newline at end of file
diff --git a/test-utils/test-runner/src/host_functions.rs b/test-utils/test-runner/src/host_functions.rs
new file mode 100644
index 0000000000000..ca8790683e6c4
--- /dev/null
+++ b/test-utils/test-runner/src/host_functions.rs
@@ -0,0 +1,70 @@
+// This file is part of Substrate.
+
+// Copyright (C) 2021 Parity Technologies (UK) Ltd.
+// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+#[macro_export]
+macro_rules! override_host_functions {
+    ($($fn_name:expr, $name:ident,)*) => {{
+        let mut host_functions = vec![];
+        $(
+            struct $name;
+            impl sp_wasm_interface::Function for $name {
+                fn name(&self) -> &str {
+                    &$fn_name
+                }
+
+                fn signature(&self) -> sp_wasm_interface::Signature {
+                    sp_wasm_interface::Signature {
+                        args: std::borrow::Cow::Owned(vec![
+                            sp_wasm_interface::ValueType::I32,
+                            sp_wasm_interface::ValueType::I64,
+                            sp_wasm_interface::ValueType::I32,
+                        ]),
+                        return_value: Some(sp_wasm_interface::ValueType::I32),
+                    }
+                }
+
+                fn execute(
+                    &self,
+                    context: &mut dyn sp_wasm_interface::FunctionContext,
+                    _args: &mut dyn Iterator<Item = sp_wasm_interface::Value>,
+                ) -> Result<Option<sp_wasm_interface::Value>, String> {
+                    <bool as sp_runtime_interface::host::IntoFFIValue>::into_ffi_value(true, context)
+                        .map(sp_wasm_interface::IntoValue::into_value)
+                        .map(Some)
+                }
+            }
+            host_functions.push(&$name as &'static dyn sp_wasm_interface::Function);
+        )*
+        host_functions
+   }};
+}
+
+/// Provides host functions that overrides runtime signature verification
+/// to always return true.
+pub struct SignatureVerificationOverride;
+
+impl sp_wasm_interface::HostFunctions for SignatureVerificationOverride {
+    fn host_functions() -> Vec<&'static dyn sp_wasm_interface::Function> {
+        override_host_functions!(
+            "ext_crypto_ecdsa_verify_version_1", EcdsaVerify,
+            "ext_crypto_ed25519_verify_version_1", Ed25519Verify,
+            "ext_crypto_sr25519_verify_version_1", Sr25519Verify,
+            "ext_crypto_sr25519_verify_version_2", Sr25519VerifyV2,
+        )
+    }
+}
diff --git a/test-utils/test-runner/src/lib.rs b/test-utils/test-runner/src/lib.rs
new file mode 100644
index 0000000000000..87ec4336d9523
--- /dev/null
+++ b/test-utils/test-runner/src/lib.rs
@@ -0,0 +1,312 @@
+// This file is part of Substrate.
+
+// Copyright (C) 2021 Parity Technologies (UK) Ltd.
+// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+//! Test runner
+//! # Substrate Test Runner
+//!
+//! Allows you to test
+//! <br />
+//!
+//! -   Migrations
+//! -   Runtime Upgrades
+//! -   Pallets and general runtime functionality.
+//!
+//! This works by running a full node with a Manual Seal-BABE™ hybrid consensus for block authoring.
+//!
+//! <h2>Note</h2>
+//! The running node has no signature verification, which allows us author extrinsics for any account on chain.
+//!     <br/>
+//!     <br/>
+//!
+//! <h2>How do I Use this?</h2>
+//!
+//!
+//! ```rust,ignore
+//! use test_runner::{Node, ChainInfo, SignatureVerificationOverride, base_path, NodeConfig};
+//! use sc_finality_grandpa::GrandpaBlockImport;
+//! use sc_service::{
+//!     TFullBackend, TFullClient, Configuration, TaskManager, new_full_parts, BasePath,
+//!     DatabaseConfig, KeepBlocks, TransactionStorageMode, ChainSpec, Role,
+//!     config::{NetworkConfiguration, KeystoreConfig},
+//! };
+//! use std::sync::Arc;
+//! use sp_inherents::InherentDataProviders;
+//! use sc_consensus_babe::BabeBlockImport;
+//! use sp_keystore::SyncCryptoStorePtr;
+//! use sp_keyring::sr25519::Keyring::{Alice, Bob};
+//! use node_cli::chain_spec::development_config;
+//! use sp_consensus_babe::AuthorityId;
+//! use manual_seal::{ConsensusDataProvider, consensus::babe::BabeConsensusDataProvider};
+//! use sp_runtime::{traits::IdentifyAccount, MultiSigner, generic::Era};
+//! use sc_executor::WasmExecutionMethod;
+//! use sc_network::{multiaddr, config::TransportConfig};
+//! use sc_client_api::execution_extensions::ExecutionStrategies;
+//! use sc_informant::OutputFormat;
+//! use sp_api::TransactionFor;
+//!
+//! type BlockImport<B, BE, C, SC> = BabeBlockImport<B, C, GrandpaBlockImport<BE, B, C, SC>>;
+//!
+//! sc_executor::native_executor_instance!(
+//! 	pub Executor,
+//! 	node_runtime::api::dispatch,
+//! 	node_runtime::native_version,
+//! 	SignatureVerificationOverride,
+//! );
+//!
+//! struct Requirements;
+//!
+//! impl ChainInfo for Requirements {
+//!     /// Provide a Block type with an OpaqueExtrinsic
+//!     type Block = node_primitives::Block;
+//!     /// Provide an Executor type for the runtime
+//!     type Executor = Executor;
+//!     /// Provide the runtime itself
+//!     type Runtime = node_runtime::Runtime;
+//!     /// A touch of runtime api
+//!     type RuntimeApi = node_runtime::RuntimeApi;
+//!     /// A pinch of SelectChain implementation
+//!     type SelectChain = sc_consensus::LongestChain<TFullBackend<Self::Block>, Self::Block>;
+//!     /// A slice of concrete BlockImport type
+//! 	type BlockImport = BlockImport<
+//! 		Self::Block,
+//! 		TFullBackend<Self::Block>,
+//! 		TFullClient<Self::Block, Self::RuntimeApi, Self::Executor>,
+//! 		Self::SelectChain,
+//!     >;
+//!     /// and a dash of SignedExtensions
+//! 	type SignedExtras = node_runtime::SignedExtra;
+//!
+//!     /// Create your signed extras here.
+//! 	fn signed_extras(
+//! 		from: <Self::Runtime as frame_system::Config>::AccountId,
+//! 	) -> Self::SignedExtension {
+//! 		let nonce = frame_system::Pallet::<Self::Runtime>::account_nonce(from);
+//!
+//! 		(
+//! 			frame_system::CheckSpecVersion::<Self::Runtime>::new(),
+//! 			frame_system::CheckTxVersion::<Self::Runtime>::new(),
+//! 			frame_system::CheckGenesis::<Self::Runtime>::new(),
+//! 			frame_system::CheckMortality::<Self::Runtime>::from(Era::Immortal),
+//! 			frame_system::CheckNonce::<Self::Runtime>::from(nonce),
+//! 			frame_system::CheckWeight::<Self::Runtime>::new(),
+//! 			pallet_transaction_payment::ChargeTransactionPayment::<Self::Runtime>::from(0),
+//! 		)
+//! 	}
+//!
+//!     /// The function signature tells you all you need to know. ;)
+//! 	fn create_client_parts(config: &Configuration) -> Result<
+//! 		(
+//! 			Arc<TFullClient<Self::Block, Self::RuntimeApi, Self::Executor>>,
+//! 			Arc<TFullBackend<Self::Block>>,
+//! 			KeyStorePtr,
+//! 			TaskManager,
+//! 			InherentDataProviders,
+//! 			Option<Box<
+//! 				dyn ConsensusDataProvider<
+//! 					Self::Block,
+//! 					Transaction = TransactionFor<
+//! 						TFullClient<Self::Block, Self::RuntimeApi, Self::Executor>,
+//! 						Self::Block
+//! 					>,
+//! 				>
+//! 			>>,
+//! 			Self::SelectChain,
+//! 			Self::BlockImport
+//! 		),
+//! 		sc_service::Error
+//! 	> {
+//! 		let (
+//! 			client,
+//! 			backend,
+//! 			keystore,
+//! 			task_manager,
+//! 		) = new_full_parts::<Self::Block, Self::RuntimeApi, Self::Executor>(config)?;
+//! 		let client = Arc::new(client);
+//!
+//! 		let inherent_providers = InherentDataProviders::new();
+//! 		let select_chain = sc_consensus::LongestChain::new(backend.clone());
+//!
+//! 		let (grandpa_block_import, ..) =
+//! 			sc_finality_grandpa::block_import(client.clone(), &(client.clone() as Arc<_>), select_chain.clone())?;
+//!
+//! 		let (block_import, babe_link) = sc_consensus_babe::block_import(
+//! 			sc_consensus_babe::Config::get_or_compute(&*client)?,
+//! 			grandpa_block_import,
+//! 			client.clone(),
+//! 		)?;
+//!
+//! 		let consensus_data_provider = BabeConsensusDataProvider::new(
+//! 			client.clone(),
+//! 			keystore.clone(),
+//! 			&inherent_providers,
+//! 			babe_link.epoch_changes().clone(),
+//! 			vec![(AuthorityId::from(Alice.public()), 1000)]
+//! 		)
+//! 		.expect("failed to create ConsensusDataProvider");
+//!
+//! 		Ok((
+//! 			client,
+//! 			backend,
+//! 			keystore,
+//! 			task_manager,
+//! 			inherent_providers,
+//! 			Some(Box::new(consensus_data_provider)),
+//! 			select_chain,
+//! 			block_import
+//! 		))
+//! 	}
+//!
+//! 	fn dispatch_with_root(call: <Self::Runtime as frame_system::Config>::Call, node: &mut Node<Self>) {
+//!         let alice = MultiSigner::from(Alice.public()).into_account();
+//! 		// for chains that support sudo, otherwise, you'd have to use pallet-democracy here.
+//!         let call = pallet_sudo::Call::sudo(Box::new(call));
+//!         node.submit_extrinsic(call, alice);
+//!         node.seal_blocks(1);
+//!     }
+//! }
+//!
+//! /// And now for the most basic test
+//!
+//! #[test]
+//! fn simple_balances_test() {
+//! 	// given
+//! 	let config = NodeConfig {
+//!			execution_strategies: ExecutionStrategies {
+//!				syncing: sc_client_api::ExecutionStrategy::NativeWhenPossible,
+//!				importing: sc_client_api::ExecutionStrategy::NativeWhenPossible,
+//!				block_construction: sc_client_api::ExecutionStrategy::NativeWhenPossible,
+//!				offchain_worker: sc_client_api::ExecutionStrategy::NativeWhenPossible,
+//!				other: sc_client_api::ExecutionStrategy::NativeWhenPossible,
+//! 		},
+//! 		chain_spec: Box::new(development_config()),
+//! 		log_targets: vec![],
+//! 	};
+//! 	let mut node = Node::<Requirements>::new(config).unwrap();
+//!
+//! 	type Balances = pallet_balances::Pallet<node_runtime::Runtime>;
+//!
+//! 	let (alice, bob) = (Alice.pair(), Bob.pair());
+//! 	let (alice_account_id, bob_acount_id) = (
+//!         MultiSigner::from(alice.public()).into_account(),
+//!         MultiSigner::from(bob.public()).into_account()
+//!     );
+//!
+//!     /// the function with_state allows us to read state, pretty cool right? :D
+//! 	let old_balance = node.with_state(|| Balances::free_balance(alice_account_id.clone()));
+//!
+//!     // 70 dots
+//!     let amount = 70_000_000_000_000;
+//!
+//!     /// Send extrinsic in action.
+//! 	node.submit_extrinsic(BalancesCall::transfer(bob_acount_id.clone(), amount), alice_account_id.clone());
+//!
+//!     /// Produce blocks in action, Powered by manual-seal™.
+//! 	node.seal_blocks(1);
+//!
+//!     /// we can check the new state :D
+//! 	let new_balance = node.with_state(|| Balances::free_balance(alice_account_id));
+//!
+//!     /// we can now make assertions on how state has changed.
+//! 	assert_eq!(old_balance + amount, new_balance);
+//! }
+//! ```
+
+use manual_seal::consensus::ConsensusDataProvider;
+use sc_executor::NativeExecutionDispatch;
+use sc_service::{Configuration, TFullBackend, TFullClient, TaskManager};
+use sp_api::{ConstructRuntimeApi, TransactionFor};
+use sp_consensus::{BlockImport, SelectChain};
+use sp_inherents::InherentDataProviders;
+use sp_keystore::SyncCryptoStorePtr;
+use sp_runtime::traits::{Block as BlockT, SignedExtension};
+use std::sync::Arc;
+
+mod node;
+mod utils;
+mod host_functions;
+
+pub use host_functions::*;
+pub use node::*;
+
+/// Wrapper trait for concrete type required by this testing framework.
+pub trait ChainInfo: Sized {
+	/// Opaque block type
+	type Block: BlockT;
+
+	/// Executor type
+	type Executor: NativeExecutionDispatch + 'static;
+
+	/// Runtime
+	type Runtime: frame_system::Config;
+
+	/// RuntimeApi
+	type RuntimeApi: Send
+		+ Sync
+		+ 'static
+		+ ConstructRuntimeApi<Self::Block, TFullClient<Self::Block, Self::RuntimeApi, Self::Executor>>;
+
+	/// select chain type.
+	type SelectChain: SelectChain<Self::Block> + 'static;
+
+	/// Block import type.
+	type BlockImport: Send
+		+ Sync
+		+ Clone
+		+ BlockImport<
+			Self::Block,
+			Error = sp_consensus::Error,
+			Transaction = TransactionFor<TFullClient<Self::Block, Self::RuntimeApi, Self::Executor>, Self::Block>,
+		> + 'static;
+
+	/// The signed extras required by the runtime
+	type SignedExtras: SignedExtension;
+
+	/// Signed extras, this function is caled in an externalities provided environment.
+	fn signed_extras(from: <Self::Runtime as frame_system::Config>::AccountId) -> Self::SignedExtras;
+
+	/// Attempt to create client parts, including block import,
+	/// select chain strategy and consensus data provider.
+	fn create_client_parts(
+		config: &Configuration,
+	) -> Result<
+		(
+			Arc<TFullClient<Self::Block, Self::RuntimeApi, Self::Executor>>,
+			Arc<TFullBackend<Self::Block>>,
+			SyncCryptoStorePtr,
+			TaskManager,
+			InherentDataProviders,
+			Option<
+				Box<
+					dyn ConsensusDataProvider<
+						Self::Block,
+						Transaction = TransactionFor<
+							TFullClient<Self::Block, Self::RuntimeApi, Self::Executor>,
+							Self::Block,
+						>,
+					>,
+				>,
+			>,
+			Self::SelectChain,
+			Self::BlockImport,
+		),
+		sc_service::Error,
+	>;
+
+	/// Given a call and a handle to the node, execute the call with root privileges.
+	fn dispatch_with_root(call: <Self::Runtime as frame_system::Config>::Call, node: &mut Node<Self>);
+}
diff --git a/test-utils/test-runner/src/node.rs b/test-utils/test-runner/src/node.rs
new file mode 100644
index 0000000000000..6965c6a804dbe
--- /dev/null
+++ b/test-utils/test-runner/src/node.rs
@@ -0,0 +1,476 @@
+// This file is part of Substrate.
+
+// Copyright (C) 2021 Parity Technologies (UK) Ltd.
+// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+use std::sync::Arc;
+
+use futures::{FutureExt, SinkExt, channel::{mpsc, oneshot}};
+use jsonrpc_core::MetaIoHandler;
+use manual_seal::{run_manual_seal, EngineCommand, ManualSealParams};
+use sc_cli::build_runtime;
+use sc_client_api::{
+	backend::{self, Backend}, CallExecutor, ExecutorProvider,
+	execution_extensions::ExecutionStrategies,
+};
+use sc_service::{
+	build_network, spawn_tasks, BuildNetworkParams, SpawnTasksParams, TFullBackend,
+	TFullCallExecutor, TFullClient, TaskManager, TaskType, ChainSpec, BasePath,
+	Configuration, DatabaseConfig, KeepBlocks, TransactionStorageMode, config::KeystoreConfig,
+};
+use sc_transaction_pool::BasicPool;
+use sp_api::{ApiExt, ConstructRuntimeApi, Core, Metadata, OverlayedChanges, StorageTransactionCache};
+use sp_block_builder::BlockBuilder;
+use sp_blockchain::HeaderBackend;
+use sp_core::ExecutionContext;
+use sp_offchain::OffchainWorkerApi;
+use sp_runtime::traits::{Block as BlockT, Extrinsic};
+use sp_runtime::{generic::BlockId, transaction_validity::TransactionSource, MultiSignature, MultiAddress};
+use sp_runtime::{generic::UncheckedExtrinsic, traits::NumberFor};
+use sp_session::SessionKeys;
+use sp_state_machine::Ext;
+use sp_transaction_pool::runtime_api::TaggedTransactionQueue;
+use sp_transaction_pool::TransactionPool;
+
+pub use crate::utils::{logger, base_path};
+use crate::ChainInfo;
+use log::LevelFilter;
+use sp_keyring::sr25519::Keyring::Alice;
+use sc_network::{multiaddr, config::{NetworkConfiguration, TransportConfig, Role}};
+use sc_informant::OutputFormat;
+use sc_executor::WasmExecutionMethod;
+
+/// This holds a reference to a running node on another thread,
+/// the node process is dropped when this struct is dropped
+/// also holds logs from the process.
+pub struct Node<T: ChainInfo> {
+	/// rpc handler for communicating with the node over rpc.
+	rpc_handler: Arc<MetaIoHandler<sc_rpc::Metadata, sc_rpc_server::RpcMiddleware>>,
+	/// Stream of log lines
+	log_stream: mpsc::UnboundedReceiver<String>,
+	/// node tokio runtime
+	_runtime: tokio::runtime::Runtime,
+	/// handle to the running node.
+	_task_manager: Option<TaskManager>,
+	/// client instance
+	client: Arc<TFullClient<T::Block, T::RuntimeApi, T::Executor>>,
+	/// transaction pool
+	pool: Arc<
+		dyn TransactionPool<
+			Block = T::Block,
+			Hash = <T::Block as BlockT>::Hash,
+			Error = sc_transaction_pool::error::Error,
+			InPoolTransaction = sc_transaction_graph::base_pool::Transaction<
+				<T::Block as BlockT>::Hash,
+				<T::Block as BlockT>::Extrinsic,
+			>,
+		>,
+	>,
+	/// channel to communicate with manual seal on.
+	manual_seal_command_sink: mpsc::Sender<EngineCommand<<T::Block as BlockT>::Hash>>,
+	/// backend type.
+	backend: Arc<TFullBackend<T::Block>>,
+	/// Block number at initialization of this Node.
+	initial_block_number: NumberFor<T::Block>
+}
+
+/// Configuration options for the node.
+pub struct NodeConfig {
+	/// A set of log targets you'd like to enable/disbale
+	pub log_targets: Vec<(&'static str, LevelFilter)>,
+
+	/// ChainSpec for the runtime
+	pub chain_spec: Box<dyn ChainSpec>,
+
+	/// wasm execution strategies.
+	pub execution_strategies: ExecutionStrategies,
+}
+
+type EventRecord<T> = frame_system::EventRecord<<T as frame_system::Config>::Event, <T as frame_system::Config>::Hash>;
+
+impl<T: ChainInfo> Node<T> {
+	/// Starts a node with the manual-seal authorship.
+	pub fn new(node_config: NodeConfig) -> Result<Self, sc_service::Error>
+	where
+		<T::RuntimeApi as ConstructRuntimeApi<T::Block, TFullClient<T::Block, T::RuntimeApi, T::Executor>>>::RuntimeApi:
+			Core<T::Block>
+				+ Metadata<T::Block>
+				+ OffchainWorkerApi<T::Block>
+				+ SessionKeys<T::Block>
+				+ TaggedTransactionQueue<T::Block>
+				+ BlockBuilder<T::Block>
+				+ ApiExt<T::Block, StateBackend = <TFullBackend<T::Block> as Backend<T::Block>>::State>,
+	{
+		let NodeConfig { log_targets, mut chain_spec, execution_strategies } = node_config;
+		let tokio_runtime = build_runtime().unwrap();
+
+		// unbounded logs, should be fine, test is shortlived.
+		let (log_sink, log_stream) = mpsc::unbounded();
+
+		logger(log_targets, tokio_runtime.handle().clone(), log_sink);
+		let runtime_handle = tokio_runtime.handle().clone();
+
+		let task_executor = move |fut, task_type| match task_type {
+			TaskType::Async => runtime_handle.spawn(fut).map(drop),
+			TaskType::Blocking => runtime_handle
+				.spawn_blocking(move || futures::executor::block_on(fut))
+				.map(drop),
+		};
+
+		let base_path = if let Some(base) = base_path() {
+			BasePath::new(base)
+		} else {
+			BasePath::new_temp_dir().expect("couldn't create a temp dir")
+		};
+		let root_path = base_path.path().to_path_buf().join("chains").join(chain_spec.id());
+
+		let key_seed = Alice.to_seed();
+		let storage = chain_spec
+			.as_storage_builder()
+			.build_storage()
+			.expect("could not build storage");
+
+		chain_spec.set_storage(storage);
+
+		let mut network_config = NetworkConfiguration::new(
+			format!("Test Node for: {}", key_seed),
+			"network/test/0.1",
+			Default::default(),
+			None,
+		);
+		let informant_output_format = OutputFormat { enable_color: false };
+
+		network_config.allow_non_globals_in_dht = true;
+
+		network_config
+			.listen_addresses
+			.push(multiaddr::Protocol::Memory(rand::random()).into());
+
+		network_config.transport = TransportConfig::MemoryOnly;
+
+		let config = Configuration {
+			impl_name: "test-node".to_string(),
+			impl_version: "0.1".to_string(),
+			role: Role::Authority,
+			task_executor: task_executor.into(),
+			transaction_pool: Default::default(),
+			network: network_config,
+			keystore: KeystoreConfig::Path {
+				path: root_path.join("key"),
+				password: None,
+			},
+			database: DatabaseConfig::RocksDb {
+				path: root_path.join("db"),
+				cache_size: 128,
+			},
+			state_cache_size: 16777216,
+			state_cache_child_ratio: None,
+			chain_spec,
+			wasm_method: WasmExecutionMethod::Interpreted,
+			execution_strategies,
+			rpc_http: None,
+			rpc_ws: None,
+			rpc_ipc: None,
+			rpc_ws_max_connections: None,
+			rpc_cors: None,
+			rpc_methods: Default::default(),
+			prometheus_config: None,
+			telemetry_endpoints: None,
+			telemetry_external_transport: None,
+			default_heap_pages: None,
+			offchain_worker: Default::default(),
+			force_authoring: false,
+			disable_grandpa: false,
+			dev_key_seed: Some(key_seed),
+			tracing_targets: None,
+			tracing_receiver: Default::default(),
+			max_runtime_instances: 8,
+			announce_block: true,
+			base_path: Some(base_path),
+			wasm_runtime_overrides: None,
+			informant_output_format,
+			disable_log_reloading: false,
+			keystore_remote: None,
+			keep_blocks: KeepBlocks::All,
+			state_pruning: Default::default(),
+			transaction_storage: TransactionStorageMode::BlockBody,
+		};
+
+		let (
+			client,
+			backend,
+			keystore,
+			mut task_manager,
+			inherent_data_providers,
+			consensus_data_provider,
+			select_chain,
+			block_import,
+		) = T::create_client_parts(&config)?;
+
+		let import_queue =
+			manual_seal::import_queue(Box::new(block_import.clone()), &task_manager.spawn_essential_handle(), None);
+
+		let transaction_pool = BasicPool::new_full(
+			config.transaction_pool.clone(),
+			true.into(),
+			config.prometheus_registry(),
+			task_manager.spawn_handle(),
+			client.clone(),
+		);
+
+		let (network, network_status_sinks, system_rpc_tx, network_starter) = {
+			let params = BuildNetworkParams {
+				config: &config,
+				client: client.clone(),
+				transaction_pool: transaction_pool.clone(),
+				spawn_handle: task_manager.spawn_handle(),
+				import_queue,
+				on_demand: None,
+				block_announce_validator_builder: None,
+			};
+			build_network(params)?
+		};
+
+		sc_service::build_offchain_workers(
+			&config,
+			task_manager.spawn_handle(),
+			client.clone(),
+			network.clone(),
+		);
+
+		// Proposer object for block authorship.
+		let env = sc_basic_authorship::ProposerFactory::new(
+			task_manager.spawn_handle(),
+			client.clone(),
+			transaction_pool.clone(),
+			config.prometheus_registry(),
+			None
+		);
+
+		// Channel for the rpc handler to communicate with the authorship task.
+		let (command_sink, commands_stream) = mpsc::channel(10);
+
+		let rpc_handlers = {
+			let params = SpawnTasksParams {
+				config,
+				client: client.clone(),
+				backend: backend.clone(),
+				task_manager: &mut task_manager,
+				keystore,
+				on_demand: None,
+				transaction_pool: transaction_pool.clone(),
+				rpc_extensions_builder: Box::new(move |_, _| jsonrpc_core::IoHandler::default()),
+				remote_blockchain: None,
+				network,
+				network_status_sinks,
+				system_rpc_tx,
+				telemetry: None
+			};
+			spawn_tasks(params)?
+		};
+
+		// Background authorship future.
+		let authorship_future = run_manual_seal(ManualSealParams {
+			block_import,
+			env,
+			client: client.clone(),
+			pool: transaction_pool.pool().clone(),
+			commands_stream,
+			select_chain,
+			consensus_data_provider,
+			inherent_data_providers,
+		});
+
+		// spawn the authorship task as an essential task.
+		task_manager
+			.spawn_essential_handle()
+			.spawn("manual-seal", authorship_future);
+
+		network_starter.start_network();
+		let rpc_handler = rpc_handlers.io_handler();
+		let initial_number = client.info().best_number;
+
+		Ok(Self {
+			rpc_handler,
+			_task_manager: Some(task_manager),
+			_runtime: tokio_runtime,
+			client,
+			pool: transaction_pool,
+			backend,
+			log_stream,
+			manual_seal_command_sink: command_sink,
+			initial_block_number: initial_number,
+		})
+	}
+
+	/// Returns a reference to the rpc handlers.
+	pub fn rpc_handler(&self) -> Arc<MetaIoHandler<sc_rpc::Metadata, sc_rpc_server::RpcMiddleware>> {
+		self.rpc_handler.clone()
+	}
+
+	/// Return a reference to the Client
+	pub fn client(&self) -> Arc<TFullClient<T::Block, T::RuntimeApi, T::Executor>> {
+		self.client.clone()
+	}
+
+	/// Executes closure in an externalities provided environment.
+	pub fn with_state<R>(&self, closure: impl FnOnce() -> R) -> R
+	where
+		<TFullCallExecutor<T::Block, T::Executor> as CallExecutor<T::Block>>::Error: std::fmt::Debug,
+	{
+		let id = BlockId::Hash(self.client.info().best_hash);
+		let mut overlay = OverlayedChanges::default();
+		let changes_trie = backend::changes_tries_state_at_block(&id, self.backend.changes_trie_storage()).unwrap();
+		let mut cache =
+			StorageTransactionCache::<T::Block, <TFullBackend<T::Block> as Backend<T::Block>>::State>::default();
+		let mut extensions = self
+			.client
+			.execution_extensions()
+			.extensions(&id, ExecutionContext::BlockConstruction);
+		let state_backend = self
+			.backend
+			.state_at(id.clone())
+			.expect(&format!("State at block {} not found", id));
+
+		let mut ext = Ext::new(
+			&mut overlay,
+			&mut cache,
+			&state_backend,
+			changes_trie.clone(),
+			Some(&mut extensions),
+		);
+		sp_externalities::set_and_run_with_externalities(&mut ext, closure)
+	}
+
+	/// submit some extrinsic to the node, providing the sending account.
+	pub fn submit_extrinsic(
+		&mut self,
+		call: impl Into<<T::Runtime as frame_system::Config>::Call>,
+		from: <T::Runtime as frame_system::Config>::AccountId,
+	) -> <T::Block as BlockT>::Hash
+	where
+		<T::Block as BlockT>::Extrinsic: From<
+			UncheckedExtrinsic<
+				MultiAddress<
+					<T::Runtime as frame_system::Config>::AccountId,
+					<T::Runtime as frame_system::Config>::Index,
+				>,
+				<T::Runtime as frame_system::Config>::Call,
+				MultiSignature,
+				T::SignedExtras,
+			>,
+		>,
+	{
+		let extra = self.with_state(|| T::signed_extras(from.clone()));
+		let signed_data = Some((from.into(), MultiSignature::Sr25519(Default::default()), extra));
+		let ext = UncheckedExtrinsic::<
+			MultiAddress<
+				<T::Runtime as frame_system::Config>::AccountId,
+				<T::Runtime as frame_system::Config>::Index,
+			>,
+			<T::Runtime as frame_system::Config>::Call,
+			MultiSignature,
+			T::SignedExtras,
+		>::new(call.into(), signed_data)
+		.expect("UncheckedExtrinsic::new() always returns Some");
+		let at = self.client.info().best_hash;
+
+		self._runtime
+			.block_on(
+				self.pool.submit_one(&BlockId::Hash(at), TransactionSource::Local, ext.into()),
+			)
+			.unwrap()
+	}
+
+	/// Get the events of the most recently produced block
+	pub fn events(&self) -> Vec<EventRecord<T::Runtime>> {
+		self.with_state(|| frame_system::Pallet::<T::Runtime>::events())
+	}
+
+	/// Checks the node logs for a specific entry.
+	pub fn assert_log_line(&mut self, content: &str) {
+		futures::executor::block_on(async {
+			use futures::StreamExt;
+
+			while let Some(log_line) = self.log_stream.next().await {
+				if log_line.contains(content) {
+					return;
+				}
+			}
+
+			panic!("Could not find {} in logs content", content);
+		});
+	}
+
+	/// Instructs manual seal to seal new, possibly empty blocks.
+	pub fn seal_blocks(&mut self, num: usize) {
+		let (tokio, sink) = (&mut self._runtime, &mut self.manual_seal_command_sink);
+
+		for count in 0..num {
+			let (sender, future_block) = oneshot::channel();
+			let future = sink.send(EngineCommand::SealNewBlock {
+				create_empty: true,
+				finalize: false,
+				parent_hash: None,
+				sender: Some(sender),
+			});
+
+			tokio.block_on(async {
+				const ERROR: &'static str = "manual-seal authorship task is shutting down";
+				future.await.expect(ERROR);
+
+				match future_block.await.expect(ERROR) {
+					Ok(block) => log::info!("sealed {} (hash: {}) of {} blocks", count + 1, block.hash, num),
+					Err(err) => log::error!("failed to seal block {} of {}, error: {:?}", count + 1, num, err),
+				}
+			});
+		}
+	}
+
+	/// Revert count number of blocks from the chain.
+	pub fn revert_blocks(&self, count: NumberFor<T::Block>) {
+		self.backend.revert(count, true).expect("Failed to revert blocks: ");
+	}
+
+	/// Revert all blocks added since creation of the node.
+	pub fn clean(&self) {
+		// if a db path was specified, revert all blocks we've added
+		if let Some(_) = base_path() {
+			let diff = self.client.info().best_number - self.initial_block_number;
+			self.revert_blocks(diff);
+		}
+	}
+
+	/// Performs a runtime upgrade given a wasm blob.
+	pub fn upgrade_runtime(&mut self, wasm: Vec<u8>)
+		where
+			<T::Runtime as frame_system::Config>::Call: From<frame_system::Call<T::Runtime>>
+	{
+		let call = frame_system::Call::set_code(wasm);
+		T::dispatch_with_root(call.into(), self);
+	}
+}
+
+impl<T: ChainInfo> Drop for Node<T> {
+	fn drop(&mut self) {
+		self.clean();
+
+		if let Some(mut task_manager) = self._task_manager.take() {
+			// if this isn't called the node will live forever
+			task_manager.terminate()
+		}
+	}
+}
diff --git a/test-utils/test-runner/src/utils.rs b/test-utils/test-runner/src/utils.rs
new file mode 100644
index 0000000000000..7cd512e2d4869
--- /dev/null
+++ b/test-utils/test-runner/src/utils.rs
@@ -0,0 +1,56 @@
+// This file is part of Substrate.
+
+// Copyright (C) 2020-2021 Parity Technologies (UK) Ltd.
+// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+use futures::{Sink, SinkExt};
+use std::fmt;
+use std::io::Write;
+use log::LevelFilter;
+
+/// Base db path gotten from env
+pub fn base_path() -> Option<String> {
+	std::env::var("DB_BASE_PATH").ok()
+}
+
+/// Builds the global logger.
+pub fn logger<S>(
+	log_targets: Vec<(&'static str, LevelFilter)>,
+	executor: tokio::runtime::Handle,
+	log_sink: S,
+)
+where
+	S: Sink<String> + Clone + Unpin + Send + Sync + 'static,
+	S::Error: Send + Sync + fmt::Debug,
+{
+	let mut builder = env_logger::builder();
+	builder.format(move |buf: &mut env_logger::fmt::Formatter, record: &log::Record| {
+		let entry = format!("{} {} {}", record.level(), record.target(), record.args());
+		let res = writeln!(buf, "{}", entry);
+
+		let mut log_sink_clone = log_sink.clone();
+		let _ = executor.spawn(async move {
+			log_sink_clone.send(entry).await.expect("log_stream is dropped");
+		});
+		res
+	});
+	builder.write_style(env_logger::WriteStyle::Always);
+
+	for (module, level) in log_targets {
+		builder.filter_module(module, level);
+	}
+	let _ = builder.is_test(true).try_init();
+}