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chore: stop proptest failures by giving fewer guarantees #32885

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merged 5 commits into from
Jan 13, 2025

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@rix0rrr rix0rrr commented Jan 13, 2025

The previous Aspect proptests were trying to assert ordering guarantees that the code didn't actually guarantee. This led to sporadic failures as the tests found scenarios in which the assertions were broken.

In this PR, cut down on the guarantees that we make: only guarantee those things on aspect applications that exist at the start of iteration, and not on aspect applications that are added during iteration.

This is not ideal, but it accurately reflects the current code and it stops intermittent failures. We will revisit tighter guarantees on aspects that are added during iteration in a later PR.

Depends-On: #32884


By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

For the Aspect property tests, make some changes to make it easier
to see what's going on:

- Instead of just a visit log, keep a log of all actions: adding
  constructs, adding aspects, and visiting are now all part of the
  same time sequence with time steps so it's easier to reason about.
- Clearly mark timed steps with `t=0`, `t=1`, etc.
The previous Aspect proptests were trying to assert ordering guarantees
that the code didn't actually guarantee. This led to sporadic failures
as the tests found scenarios in which the assertions were broken.

In this PR, cut down on the guarantees that we make: only guarantee
those things on aspect applications that exist at the start of
iteration, and not on aspect applications that are added during
iteration.

This is not ideal, but it accurately reflects the current code and it
stops intermittent failures. We will revisit tighter guarantees
on aspects that are added during iteration in a later PR.
@rix0rrr rix0rrr requested a review from a team as a code owner January 13, 2025 11:02
@github-actions github-actions bot added the p2 label Jan 13, 2025
@aws-cdk-automation aws-cdk-automation requested a review from a team January 13, 2025 11:03
@mergify mergify bot added the contribution/core This is a PR that came from AWS. label Jan 13, 2025
Base automatically changed from huijbers/proptest-better-logging to main January 13, 2025 12:50
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codecov bot commented Jan 13, 2025

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.41%. Comparing base (97af31b) to head (5523983).
Report is 1 commits behind head on main.

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@@           Coverage Diff           @@
##             main   #32885   +/-   ##
=======================================
  Coverage   81.41%   81.41%           
=======================================
  Files         223      223           
  Lines       13721    13721           
  Branches     2416     2416           
=======================================
  Hits        11171    11171           
  Misses       2271     2271           
  Partials      279      279           
Flag Coverage Δ
suite.unit 81.41% <ø> (ø)

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Components Coverage Δ
packages/aws-cdk 80.75% <ø> (ø)
packages/aws-cdk-lib/core 82.10% <ø> (ø)

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mergify bot commented Jan 13, 2025

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

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  • CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
  • Commit ID: 5523983
  • Result: SUCCEEDED
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@mergify mergify bot merged commit f0e2f2a into main Jan 13, 2025
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mergify bot commented Jan 13, 2025

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

@mergify mergify bot deleted the huijbers/silence-proptest-errors branch January 13, 2025 16:27
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3 participants