pulumiTest Integration tests

[VenelinMartinov]

This refactors the cross-tests to expose an integration test module pulCheck for use outside of cross-tests.

It allows us to easily write integration tests where we specify a TF schema, which gets bridged and use the pulumiTest framework for the test itself.

[t0yv0]

https://github.com/pulumi/pulumi-terraform-bridge/blob/master/pkg/tests/cross-tests/input_check.go#L132 already using it. Whatever is most convenient.

[VenelinMartinov]

Yeah, absolutely, it's where I adapted this from.

I was wondering if we should abstract the part about bridging a TF provider and hooking it up to pulumiTest for wider use in the bridge.

[t0yv0]

Yes, it would. We have a few ProgramTest tests but rebuilding the underlying provider is a bit of a hassle. But it would be really useful to have a quick stencil way to define a quick schema, program in one place and exercise it end to end, under Pulumi and/or TF, with debugging attached by default. Streamlining this would help contributors adding integration tests.

[iwahbe]

This looks really helpful to me.

[codecov]

Codecov Report

Attention: Patch coverage is 78.47222% with 31 lines in your changes missing coverage. Please review.

Project coverage is 61.27%. Comparing base (a167cca) to head (aa2be4b).
Report is 2 commits behind head on master.

Files	Patch %	Lines
pkg/tests/internal/pulcheck/pulcheck.go	81.31%	13 Missing and 4 partials ⚠️
pkg/tests/cross-tests/assert.go	27.77%	11 Missing and 2 partials ⚠️
pkg/tests/cross-tests/input_check.go	90.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2052      +/-   ##
==========================================
+ Coverage   61.20%   61.27%   +0.06%     
==========================================
  Files         337      339       +2     
  Lines       45177    45075     -102     
==========================================
- Hits        27651    27619      -32     
+ Misses      16005    15936      -69     
+ Partials     1521     1520       -1     

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[iwahbe]

LGTM