miner capacity upgrade scenario test

[acruikshank]

Motivation

We want to integration test more of the actor code, and a capacity upgrade for a sector containing deals is a good way to hit a lot of different actor functionality including the verified registry and market actor

Proposed Changes

1. Add TestReplaceCommittedCapacitySectorWithDealLadenSector
2. Move scenario tests into their own files named after flow under test instead of primary actor.
3. Add public GetClaim method to power.State to permit retrieval power.
4. Various small changes to test vm to ease testing.
5. Additions to vm testing to advance till a sectors proving period and methods to inspect power state.

cc @wadealexc

[anorth]

This is good.

I think we should pause after this to write some helpers, especially around common-case params construction, to reduce noise. If we make a stateful component (i.e. that knows it's own address, next sector number etc), with no deps, it could be a component of the miner agent later.

[anorth]

Can you use nil? I'm guessing nil is interpreted as "don't care", but I think that would be fine here.

[acruikshank]

I started out leaving subinvocations at the leaves untested, but I wasn't sure whether the leaves were actually leaves. This guarantees there are no unexpected calls between actors.

[anorth]

Could you please follow up to put this in singletons.go too?

[acruikshank]

#1031

[wadealexc]

Nice! Looks like you hit mostly the happy paths. It'd be good to also test the unhappy paths I mentioned - especially the one where deal init timeout results in a RestoreBytes invocation. That one's primarily Market actor functionality (CronTick), so it'd be good to cover it as well.

[codecov-commenter]

Codecov Report

Merging #1030 into master will decrease coverage by 0.0%.
The diff coverage is 60.0%.

@@           Coverage Diff            @@
##           master   #1030     +/-   ##
========================================
- Coverage    73.8%   73.8%   -0.1%     
========================================
  Files          57      57             
  Lines        6610    6615      +5     
========================================
+ Hits         4880    4883      +3     
- Misses       1108    1109      +1     
- Partials      622     623      +1