diff --git a/.bazelignore b/.bazelignore
index 0bfcff7c65..5051cf280e 100644
--- a/.bazelignore
+++ b/.bazelignore
@@ -1,6 +1,6 @@
 node_modules
 examples/program/node_modules
-internal/npm_install/test/package/node_modules
+internal/npm_install/test/node_modules
 dist
 # Each e2e test is a nested workspace
 e2e/
diff --git a/.circleci/config.yml b/.circleci/config.yml
index 315344ad3d..55008a3a03 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -11,7 +11,7 @@
 # If you change the `default_docker_image` version, also change the `cache_key` version
 var_1: &default_docker_image circleci/node:10.12
 var_2: &browsers_docker_image circleci/node:10.12-browsers
-var_3: &cache_key node-0.12-{{ checksum "yarn.lock" }}-{{ checksum "examples/program/yarn.lock" }}-{{ checksum "internal/npm_install/test/package/yarn.lock" }}-2
+var_3: &cache_key node-0.12-{{ checksum "yarn.lock" }}-{{ checksum "examples/program/yarn.lock" }}
 
 var_4: &init_environment
   run:
@@ -105,7 +105,6 @@ jobs:
           paths:
             - "node_modules"
             - "examples/program/node_modules"
-            - "internal/npm_install/test/package/node_modules"
 
       # Persist any changes at this point to be reused by further jobs.
       - persist_to_workspace:
diff --git a/.gitignore b/.gitignore
index 695c1e66ce..6086e1a894 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,7 +6,6 @@ bazel-out
 /examples/*/bazel-*
 /packages/*/bazel-*
 /internal/e2e/*/bazel-*
-/internal/npm_install/test/package/*
 node_modules
 !/internal/npm_install/test/golden/node_modules
 examples/vendored_node/node-v10.12.0-linux-x64
diff --git a/WORKSPACE b/WORKSPACE
index 05f52b9dbd..b173032ae8 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -19,6 +19,7 @@ workspace(
         "@fine_grained_deps_yarn": ["internal/e2e/fine_grained_deps/yarn/node_modules"],
         "@fine_grained_no_bin": ["internal/e2e/fine_grained_no_bin/node_modules"],
         "@npm": ["node_modules"],
+        "@npm_install_test": ["internal/npm_install/test/node_modules"],
     },
 )
 
@@ -73,9 +74,7 @@ node_repositories(
     package_json = [
         "//:package.json",
         "@examples_program//:package.json",
-        "//internal/npm_install/test:package/package.json",
     ],
-    preserve_symlinks = True,
 )
 
 yarn_install(
@@ -147,6 +146,44 @@ yarn_install(
     yarn_lock = "//internal/e2e/fine_grained_no_bin:yarn.lock",
 )
 
+yarn_install(
+    name = "npm_install_test",
+    manual_build_file_contents = """
+filegroup(
+  name = "test_files",
+  srcs = [
+    "//:BUILD.bazel",
+    "//:install_bazel_dependencies.bzl",
+    "//:manual_build_file_contents",
+    "//:WORKSPACE",
+    "//@angular/core:BUILD.bazel",
+    "//@gregmagolan:BUILD.bazel",
+    "//@gregmagolan/test-a/bin:BUILD.bazel",
+    "//@gregmagolan/test-a:BUILD.bazel",
+    "//@gregmagolan/test-b/bin:BUILD.bazel",
+    "//@gregmagolan/test-b:BUILD.bazel",
+    "//ajv:BUILD.bazel",
+    "//jasmine/bin:BUILD.bazel",
+    "//jasmine:BUILD.bazel",
+    "//rxjs:BUILD.bazel",
+    "//unidiff/bin:BUILD.bazel",
+    "//unidiff:BUILD.bazel",
+    "//zone.js:BUILD.bazel",
+    "//node_modules/@angular/core:BUILD.bazel",
+    "//node_modules/@gregmagolan:BUILD.bazel",
+    "//node_modules/@gregmagolan/test-a:BUILD.bazel",
+    "//node_modules/@gregmagolan/test-b:BUILD.bazel",
+    "//node_modules/ajv:BUILD.bazel",
+    "//node_modules/jasmine:BUILD.bazel",
+    "//node_modules/rxjs:BUILD.bazel",
+    "//node_modules/unidiff:BUILD.bazel",
+    "//node_modules/zone.js:BUILD.bazel",
+  ],
+)""",
+    package_json = "//internal/npm_install/test:package.json",
+    yarn_lock = "//internal/npm_install/test:yarn.lock",
+)
+
 load("@bazel_toolchains//rules:rbe_repo.bzl", "rbe_autoconfig")
 
 # Creates toolchain configuration for remote execution with BuildKite CI
diff --git a/internal/npm_install/generate_build_file.js b/internal/npm_install/generate_build_file.js
index 92b3ea6933..122eb2cdba 100644
--- a/internal/npm_install/generate_build_file.js
+++ b/internal/npm_install/generate_build_file.js
@@ -702,7 +702,15 @@ function filterFiles(files, exts = []) {
       return false;
     })
   }
-  return files;
+  // Filter out internal files
+  return files.filter(file => {
+    const basenameUc = path.basename(file).toUpperCase();
+    if (basenameUc === '_WORKSPACE' || basenameUc === '_BUILD' || basenameUc === '_BUILD.BAZEL' ||
+        basenameUc === '_BAZEL_MARKER') {
+      return false;
+    }
+    return true;
+  });
 }
 
 /**
diff --git a/internal/npm_install/test/BUILD.bazel b/internal/npm_install/test/BUILD.bazel
index e63a5bf8d6..a2c1e9ecbb 100644
--- a/internal/npm_install/test/BUILD.bazel
+++ b/internal/npm_install/test/BUILD.bazel
@@ -1,10 +1,5 @@
 load("@build_bazel_rules_nodejs//:defs.bzl", "jasmine_node_test", "nodejs_binary")
 
-filegroup(
-    name = "package",
-    srcs = glob(["package/**"]),
-)
-
 filegroup(
     name = "goldens",
     srcs = glob(["golden/**"]),
@@ -16,10 +11,10 @@ jasmine_node_test(
     data = [
         ":check.js",
         ":goldens",
-        ":package",
         "//internal/npm_install:generate_build_file",
         "@npm//jasmine",
         "@npm//unidiff",
+        "@npm_install_test//:test_files",
     ],
 )
 
@@ -28,11 +23,10 @@ nodejs_binary(
     data = [
         ":check.js",
         ":goldens",
-        ":package",
         ":update_golden.js",
-        "//internal/npm_install:generate_build_file",
         "@npm//jasmine",
         "@npm//unidiff",
+        "@npm_install_test//:test_files",
     ],
     entry_point = ":update_golden.js",
     install_source_map_support = False,
diff --git a/internal/npm_install/test/check.js b/internal/npm_install/test/check.js
index d9d618d1a3..b0f3d5adc2 100644
--- a/internal/npm_install/test/check.js
+++ b/internal/npm_install/test/check.js
@@ -1,21 +1,11 @@
-const generator = require('../generate_build_file');
 const fs = require('fs');
 const path = require('path');
 const unidiff = require('unidiff')
 
-function runGenerator() {
-  // We must change the directory to the BUILD file path
-  // so the generator is able to run
-  process.chdir(path.posix.join(path.dirname(__filename), 'package'));
-
-  // Run the BUILD file generator
-  generator.main();
-}
-
 function check(file, updateGolden = false) {
   // Strip comments from generated file for comparison to golden
   // to make comparison less brittle
-  const actual = path.posix.join(path.dirname(__filename), 'package', file);
+  const actual = require.resolve(path.posix.join('npm_install_test', file));
   const actualContents =
       fs.readFileSync(actual, {encoding: 'utf-8'})
           .replace(/\r\n/g, '\n')
@@ -56,10 +46,12 @@ Update the golden file:
 }
 
 module.exports = {
-  runGenerator,
   check,
   files: [
     'BUILD.bazel',
+    'install_bazel_dependencies.bzl',
+    'manual_build_file_contents',
+    'WORKSPACE',
     '@angular/core/BUILD.bazel',
     '@gregmagolan/BUILD.bazel',
     '@gregmagolan/test-a/bin/BUILD.bazel',
diff --git a/internal/npm_install/test/generate_build_file.spec.js b/internal/npm_install/test/generate_build_file.spec.js
index 9e4155d5b6..08fdae04ef 100644
--- a/internal/npm_install/test/generate_build_file.spec.js
+++ b/internal/npm_install/test/generate_build_file.spec.js
@@ -1,9 +1,8 @@
-const {runGenerator, check, files} = require('./check');
+const {check, files} = require('./check');
 const {printPackage} = require('../generate_build_file');
 
 describe('build file generator', () => {
   describe('integration test', () => {
-    runGenerator();
     files.forEach(file => {
       it(`should produce a BUILD file for ${file}`, () => {
         check(file);
@@ -43,7 +42,7 @@ describe('build file generator', () => {
       expect(printPackage({...pkg, _files: [], bin: {}})).not.toContain('nodejs_binary');
     });
 
-    it('bin entry is an object with an empth path', () => {
+    it('bin entry is an object with an empty path', () => {
       expect(printPackage(
                  {...pkg, _files: [], bin: {empty_string: '', _null: null, _undefined: undefined}}))
           .not.toContain('nodejs_binary');
diff --git a/internal/npm_install/test/golden/BUILD.bazel.golden b/internal/npm_install/test/golden/BUILD.bazel.golden
index 826baadc84..734122cb6a 100644
--- a/internal/npm_install/test/golden/BUILD.bazel.golden
+++ b/internal/npm_install/test/golden/BUILD.bazel.golden
@@ -60,3 +60,34 @@ node_module_library(
         "//node_modules/@gregmagolan/test-b:test-b__contents",
     ],
 )
+filegroup(
+  name = "test_files",
+  srcs = [
+    "//:BUILD.bazel",
+    "//:install_bazel_dependencies.bzl",
+    "//:manual_build_file_contents",
+    "//:WORKSPACE",
+    "//@angular/core:BUILD.bazel",
+    "//@gregmagolan:BUILD.bazel",
+    "//@gregmagolan/test-a/bin:BUILD.bazel",
+    "//@gregmagolan/test-a:BUILD.bazel",
+    "//@gregmagolan/test-b/bin:BUILD.bazel",
+    "//@gregmagolan/test-b:BUILD.bazel",
+    "//ajv:BUILD.bazel",
+    "//jasmine/bin:BUILD.bazel",
+    "//jasmine:BUILD.bazel",
+    "//rxjs:BUILD.bazel",
+    "//unidiff/bin:BUILD.bazel",
+    "//unidiff:BUILD.bazel",
+    "//zone.js:BUILD.bazel",
+    "//node_modules/@angular/core:BUILD.bazel",
+    "//node_modules/@gregmagolan:BUILD.bazel",
+    "//node_modules/@gregmagolan/test-a:BUILD.bazel",
+    "//node_modules/@gregmagolan/test-b:BUILD.bazel",
+    "//node_modules/ajv:BUILD.bazel",
+    "//node_modules/jasmine:BUILD.bazel",
+    "//node_modules/rxjs:BUILD.bazel",
+    "//node_modules/unidiff:BUILD.bazel",
+    "//node_modules/zone.js:BUILD.bazel",
+  ],
+)
\ No newline at end of file
diff --git a/internal/npm_install/test/golden/WORKSPACE.golden b/internal/npm_install/test/golden/WORKSPACE.golden
new file mode 100644
index 0000000000..9253255d3f
--- /dev/null
+++ b/internal/npm_install/test/golden/WORKSPACE.golden
@@ -0,0 +1 @@
+workspace(name = "npm_install_test")
diff --git a/internal/npm_install/test/golden/install_bazel_dependencies.bzl.golden b/internal/npm_install/test/golden/install_bazel_dependencies.bzl.golden
new file mode 100644
index 0000000000..f4bd6eb84d
--- /dev/null
+++ b/internal/npm_install/test/golden/install_bazel_dependencies.bzl.golden
@@ -0,0 +1,2 @@
+def install_bazel_dependencies():
+    """Installs all workspaces listed in bazelWorkspaces of all npm packages"""
diff --git a/internal/npm_install/test/golden/manual_build_file_contents.golden b/internal/npm_install/test/golden/manual_build_file_contents.golden
new file mode 100755
index 0000000000..b18fcdc6a8
--- /dev/null
+++ b/internal/npm_install/test/golden/manual_build_file_contents.golden
@@ -0,0 +1,32 @@
+
+filegroup(
+  name = "test_files",
+  srcs = [
+    "//:BUILD.bazel",
+    "//:install_bazel_dependencies.bzl",
+    "//:manual_build_file_contents",
+    "//:WORKSPACE",
+    "//@angular/core:BUILD.bazel",
+    "//@gregmagolan:BUILD.bazel",
+    "//@gregmagolan/test-a/bin:BUILD.bazel",
+    "//@gregmagolan/test-a:BUILD.bazel",
+    "//@gregmagolan/test-b/bin:BUILD.bazel",
+    "//@gregmagolan/test-b:BUILD.bazel",
+    "//ajv:BUILD.bazel",
+    "//jasmine/bin:BUILD.bazel",
+    "//jasmine:BUILD.bazel",
+    "//rxjs:BUILD.bazel",
+    "//unidiff/bin:BUILD.bazel",
+    "//unidiff:BUILD.bazel",
+    "//zone.js:BUILD.bazel",
+    "//node_modules/@angular/core:BUILD.bazel",
+    "//node_modules/@gregmagolan:BUILD.bazel",
+    "//node_modules/@gregmagolan/test-a:BUILD.bazel",
+    "//node_modules/@gregmagolan/test-b:BUILD.bazel",
+    "//node_modules/ajv:BUILD.bazel",
+    "//node_modules/jasmine:BUILD.bazel",
+    "//node_modules/rxjs:BUILD.bazel",
+    "//node_modules/unidiff:BUILD.bazel",
+    "//node_modules/zone.js:BUILD.bazel",
+  ],
+)
\ No newline at end of file
diff --git a/internal/npm_install/test/golden/node_modules/rxjs/BUILD.bazel.golden b/internal/npm_install/test/golden/node_modules/rxjs/BUILD.bazel.golden
index c0b791f379..51525ec69f 100644
--- a/internal/npm_install/test/golden/node_modules/rxjs/BUILD.bazel.golden
+++ b/internal/npm_install/test/golden/node_modules/rxjs/BUILD.bazel.golden
@@ -2793,7 +2793,6 @@ filegroup(
         ":src/SubjectSubscription.ts",
         ":src/Subscriber.ts",
         ":src/Subscription.ts",
-        ":src/_WORKSPACE",
         ":src/add/observable/bindCallback.ts",
         ":src/add/observable/bindNodeCallback.ts",
         ":src/add/observable/combineLatest.ts",
diff --git a/internal/npm_install/test/package/package.json b/internal/npm_install/test/package.json
similarity index 80%
rename from internal/npm_install/test/package/package.json
rename to internal/npm_install/test/package.json
index 1ddc4d9150..a0f57e5584 100644
--- a/internal/npm_install/test/package/package.json
+++ b/internal/npm_install/test/package.json
@@ -10,8 +10,5 @@
     "rxjs": "^6.4.0",
     "unidiff": "0.0.4",
     "zone.js": "^0.9.0"
-  },
-  "scripts": {
-    "postinstall": "node delete_build_files.js"
   }
 }
diff --git a/internal/npm_install/test/package/delete_build_files.js b/internal/npm_install/test/package/delete_build_files.js
deleted file mode 100644
index 8004e71a88..0000000000
--- a/internal/npm_install/test/package/delete_build_files.js
+++ /dev/null
@@ -1,25 +0,0 @@
-/**
- * @fileoverview
- * BUILD files in node modules have to be deleted because runfiles are not used
- * on Windows. On Windows, the `package` glob sees *all* files because
- * `generate_build_file.js` deletes BUILD files from the actual source.
- * On other systems, the glob does not cross package boundary, so only a subset
- * of files are included in runfiles. Deleting the Bazel files in postinstall
- * allows other systems to match the behavior on Windows.
- */
-
-const fs = require('fs');
-
-const files = [
-  "node_modules/rxjs/src/webSocket/BUILD.bazel",
-  "node_modules/rxjs/src/operators/BUILD.bazel",
-  "node_modules/rxjs/src/testing/BUILD.bazel",
-  "node_modules/rxjs/src/BUILD.bazel",
-  "node_modules/rxjs/src/ajax/BUILD.bazel",
-];
-
-for (const file of files) {
-  if (fs.existsSync(file)) {
-    fs.unlinkSync(file);
-  }
-}
diff --git a/internal/npm_install/test/update_golden.js b/internal/npm_install/test/update_golden.js
index 9165df1644..ce22df4630 100644
--- a/internal/npm_install/test/update_golden.js
+++ b/internal/npm_install/test/update_golden.js
@@ -1,4 +1,3 @@
-const {runGenerator, check, files} = require('./check');
+const {check, files} = require('./check');
 
-runGenerator();
 files.forEach(file => check(file, true));
diff --git a/internal/npm_install/test/package/yarn.lock b/internal/npm_install/test/yarn.lock
similarity index 100%
rename from internal/npm_install/test/package/yarn.lock
rename to internal/npm_install/test/yarn.lock