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Copilot · 2025-12-22T22:30:55Z

Original prompt

This section details on the original issue you should resolve

<issue_title>Show a clearer diff for asymmetric matcher test results</issue_title>
<issue_description>### Clear and concise description of the problem

When using asymmetric matchers, the output is very hard to read - it always takes me a few minutes and need to add more log code to figure out which part is actually unexpected.

Error: AssertionError: expected { …(3) } to match object { model: StringMatching{…}, …(2) }

- Expected
+ Received

@@ -1,23 +1,20 @@
  {
-   "instances": ArrayContaining [
-     ObjectContaining {
-       "prompt": StringMatching /^(?=.*walking)(?=.*together)(?=.*park).*/i,
-       "referenceImages": ArrayContaining [
-         ObjectContaining {
-           "image": ObjectContaining {
-             "gcsUri": StringContaining "person1.jpg",
+   "instances": [
+     {
+       "image": {
+         "gcsUri": "gs://example/person1.jpg",
          "mimeType": "image/jpeg",
        },
-           "referenceType": StringMatching /^(asset|style)$/,
-         },
-         ObjectContaining {
-           "image": ObjectContaining {
-             "gcsUri": StringContaining "person2.png",
+       "prompt": "A park scene with two figures walking together",
+       "referenceImages": [
+         {
+           "image": {
+             "gcsUri": "gs://example/person2.png",
              "mimeType": "image/png",
            },
-           "referenceType": StringMatching /^(asset|style)$/,
+           "referenceType": "asset",
          },
        ],
      },
    ],
    "model": StringMatching /^veo-3\.1-(fast-)?generate-preview$/,

 ❯ src/assisted-mode/assisted-mode.test.ts:31:34

Any plan to improve it?

Alternative

No response

Additional context

I have a lot fixtures like this and it's a hard time to debug them.

Validations

Follow our Code of Conduct
Read the Contributing Guidelines.
Read the docs.
Check that there isn't already an issue that request the same feature to avoid creating a duplicate.</issue_description>

<agent_instructions>Write a test first to see how the diff looks like. The example of correct diff in the issues description is a little bit wrong because it uses expect.* methods instead of ObjectContaining/Object, the correct version should just show the original line ([ instead of ArrayContaining and { istead of ObjectContaining)</agent_instructions>

Comments on the Issue (you are @copilot in this section)

Fixes Show a clearer diff for asymmetric matcher test results #9046

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- Modified `replaceAsymmetricMatcher` to unwrap container matchers (ArrayContaining, ObjectContaining) - When matchers match, replace expected with actual value to show uniform structure - When matchers don't match, unwrap container matchers but keep simple matchers for clarity - Added test cases to demonstrate improved diff output Co-authored-by: sheremet-va <[email protected]>

- Updated snapshots in jest-expect.test.ts and expect.test.ts to reflect improved diff output - Removed console.log statements from asymmetric-diff.test.ts - Changed to use expect().toThrowError() pattern instead of try-catch - All tests passing, linting clean, typecheck passing Co-authored-by: sheremet-va <[email protected]>

- Added 'in' operator check before accessing sample property on asymmetric matchers - Prevents potential runtime errors if sample property doesn't exist - Addresses code review feedback Co-authored-by: sheremet-va <[email protected]>

test/core/test/asymmetric-diff.test.ts

- Changed tests to use try-catch with expect.unreachable() pattern - Added imports for stripVTControlCharacters and processError - Validate actual diff output using toMatchInlineSnapshot() - Snapshots show the improved diff format with clear structure Co-authored-by: sheremet-va <[email protected]>

sheremet-va

CI is failing.

Also move your test to test/core/diff.test.ts and use its helpers similar to other tests there

- Removed asymmetric-diff.test.ts file - Moved tests to diff.test.ts using the existing getErrorDiff helper - Removed redundant getMatchObjectErrorDiff helper (toEqual works identically) - Updated existing test snapshots to reflect improved diff output - All tests passing Co-authored-by: sheremet-va <[email protected]>

Copilot · 2025-12-22T23:18:43Z

CI is failing, you didn't run all the tests correctly.

Also move your test to test/core/diff.test.ts and use its helpers similar to other tests there

Fixed the CI failures and moved the tests to test/core/test/diff.test.ts using the existing getErrorDiff helper. Removed the separate test file and redundant helper function. All tests now pass. Commit: 2da0426

sheremet-va · 2025-12-23T10:13:46Z

Not sure if this is a breaking change, but I prefer how it looks after this PR. 🤔

Smrtnyk · 2025-12-23T13:01:44Z

Not sure if this is a breaking change, but I prefer how it looks after this PR. 🤔

I don't think it is, since it doesn't change tests behavior in itself, just how it presents the diff

packages/utils/src/diff/index.ts

…rocessing - Added test showing nested matchers within objectContaining - Demonstrates that recursion ensures nested matchers (Any, StringContaining) are processed - Without recursion, nested matchers wouldn't be replaced with actual values - Test shows matching nested matchers display actual values, non-matching show clear diff Co-authored-by: hi-ogawa <[email protected]>

Removed the test case that was intended to show why recursion is needed, as it doesn't actually fail when recursion is removed (as pointed out in code review). The recursion in lines 342-363 processes the .sample property of container matchers, but a proper test demonstrating its necessity would require showing different behavior, which the current test doesn't achieve. Co-authored-by: hi-ogawa <[email protected]>

hi-ogawa · 2025-12-24T08:37:12Z

The change makes sense to me. I asked one question to copilot and seems struggling though #9330.

packages/utils/src/diff/index.ts

This PR contains the following updates: | Package | Change | [Age](https://docs.renovatebot.com/merge-confidence/) | [Confidence](https://docs.renovatebot.com/merge-confidence/) | |---|---|---|---| | [@vitest/coverage-v8](https://github.com/vitest-dev/vitest/tree/main/packages/coverage-v8#readme) ([source](https://github.com/vitest-dev/vitest/tree/HEAD/packages/coverage-v8)) | [`4.0.16` → `4.0.18`](https://renovatebot.com/diffs/npm/@vitest%2fcoverage-v8/4.0.16/4.0.18) | ![age](https://developer.mend.io/api/mc/badges/age/npm/@vitest%2fcoverage-v8/4.0.18?slim=true) | ![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/@vitest%2fcoverage-v8/4.0.16/4.0.18?slim=true) | | [vitest](https://vitest.dev) ([source](https://github.com/vitest-dev/vitest/tree/HEAD/packages/vitest)) | [`4.0.16` → `4.0.18`](https://renovatebot.com/diffs/npm/vitest/4.0.16/4.0.18) | ![age](https://developer.mend.io/api/mc/badges/age/npm/vitest/4.0.18?slim=true) | ![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/vitest/4.0.16/4.0.18?slim=true) | --- ### Release Notes <details> <summary>vitest-dev/vitest (@vitest/coverage-v8)</summary> ### [`v4.0.18`](https://github.com/vitest-dev/vitest/releases/tag/v4.0.18) [Compare Source](vitest-dev/vitest@v4.0.17...v4.0.18) ##### 🚀 Experimental Features - **experimental**: Add `onModuleRunner` hook to `worker.init` - by [@sheremet-va](https://github.com/sheremet-va) in [#9286](vitest-dev/vitest#9286) [<samp>(ea837)</samp>](vitest-dev/vitest@ea837de7d) ##### 🐞 Bug Fixes - Use `meta.url` in `createRequire` - by [@sheremet-va](https://github.com/sheremet-va) in [#9441](vitest-dev/vitest#9441) [<samp>(e0572)</samp>](vitest-dev/vitest@e057281ca) - **browser**: Hide injected data-testid attributes - by [@sheremet-va](https://github.com/sheremet-va) in [#9503](vitest-dev/vitest#9503) [<samp>(f8989)</samp>](vitest-dev/vitest@f89899cd8) - **ui**: Process artifact attachments when generating HTML reporter - by [@macarie](https://github.com/macarie) in [#9472](vitest-dev/vitest#9472) [<samp>(22543)</samp>](vitest-dev/vitest@225435647) ##### [View changes on GitHub](vitest-dev/vitest@v4.0.17...v4.0.18) ### [`v4.0.17`](https://github.com/vitest-dev/vitest/releases/tag/v4.0.17) [Compare Source](vitest-dev/vitest@v4.0.16...v4.0.17) ##### 🚀 Experimental Features - Support openTelemetry for browser mode - by [@hi-ogawa](https://github.com/hi-ogawa) in [#9180](vitest-dev/vitest#9180) [<samp>(1ec3a)</samp>](vitest-dev/vitest@1ec3a8b68) - Support TRACEPARENT and TRACESTATE environment variables for OpenTelemetry context propagation - by [@Copilot](https://github.com/Copilot), **hi-ogawa** and [@hi-ogawa](https://github.com/hi-ogawa) in [#9295](vitest-dev/vitest#9295) [<samp>(876cb)</samp>](vitest-dev/vitest@876cb84c2) ##### 🐞 Bug Fixes - Improve asymmetric matcher diff readability by unwrapping container matchers - by [@Copilot](https://github.com/Copilot), **sheremet-va**, **hi-ogawa** and [@hi-ogawa](https://github.com/hi-ogawa) in [#9330](vitest-dev/vitest#9330) [<samp>(b2ec7)</samp>](vitest-dev/vitest@b2ec724a8) - Improve runner error when importing outside of test context - by [@sheremet-va](https://github.com/sheremet-va) in [#9335](vitest-dev/vitest#9335) [<samp>(2dd3d)</samp>](vitest-dev/vitest@2dd3dd839) - Replace crypto.randomUUID to allow insecure environments (fix [#9](https://github.com/vitest-dev/vitest/issues/9)… - by [@plusgut](https://github.com/plusgut) in [#9339](vitest-dev/vitest#9339) and [#9](vitest-dev/vitest#9) [<samp>(e6a3f)</samp>](vitest-dev/vitest@e6a3f8cc7) - Handle null options in `addEventHandler` [#9371](vitest-dev/vitest#9371) - by [@ThibautMarechal](https://github.com/ThibautMarechal) in [#9372](vitest-dev/vitest#9372) and [#9371](vitest-dev/vitest#9371) [<samp>(40841)</samp>](vitest-dev/vitest@40841ff00) - Typo in browser.provider error - by [@deammer](https://github.com/deammer) in [#9394](vitest-dev/vitest#9394) [<samp>(4b67f)</samp>](vitest-dev/vitest@4b67fc25a) - **browser**: - Fix `process.env` and `import.meta.env` defines in inline project - by [@hi-ogawa](https://github.com/hi-ogawa) in [#9239](vitest-dev/vitest#9239) [<samp>(b70c9)</samp>](vitest-dev/vitest@b70c96121) - Fix upload File instance - by [@hi-ogawa](https://github.com/hi-ogawa) in [#9294](vitest-dev/vitest#9294) [<samp>(b6778)</samp>](vitest-dev/vitest@b67788c69) - Fix invalid project token for artifacts assets - by [@hi-ogawa](https://github.com/hi-ogawa) in [#9321](vitest-dev/vitest#9321) [<samp>(caa7d)</samp>](vitest-dev/vitest@caa7d73d4) - Log `ErrorEvent.message` when unhandled `ErrorEvent.error` is null - by [@hi-ogawa](https://github.com/hi-ogawa) in [#9322](vitest-dev/vitest#9322) [<samp>(5d84e)</samp>](vitest-dev/vitest@5d84eeb91) - Support `fileParallelism` on an instance - by [@sheremet-va](https://github.com/sheremet-va) in [#9328](vitest-dev/vitest#9328) [<samp>(15006)</samp>](vitest-dev/vitest@150065459) - **coverage**: - Remove unnecessary `istanbul-lib-source-maps` usage - by [@AriPerkkio](https://github.com/AriPerkkio) in [#9344](vitest-dev/vitest#9344) [<samp>(b0940)</samp>](vitest-dev/vitest@b09405375) - Apply patch from [istanbuljs/istanbuljs#837](istanbuljs/istanbuljs#837) - by [@AriPerkkio](https://github.com/AriPerkkio) and **sapphi-red** in [#9413](vitest-dev/vitest#9413) and [#837](vitest-dev/vitest#837) [<samp>(e05ce)</samp>](vitest-dev/vitest@e05cedbf4) - **fsModuleCache**: - Don't store importers in cache - by [@sheremet-va](https://github.com/sheremet-va) in [#9422](vitest-dev/vitest#9422) [<samp>(75136)</samp>](vitest-dev/vitest@751364eec) - Add importers alongside importedModules - by [@sheremet-va](https://github.com/sheremet-va) in [#9423](vitest-dev/vitest#9423) [<samp>(59f92)</samp>](vitest-dev/vitest@59f92d403) - **mocker**: - Fix mock transform with class - by [@hi-ogawa](https://github.com/hi-ogawa) in [#9421](vitest-dev/vitest#9421) [<samp>(d390e)</samp>](vitest-dev/vitest@d390eb527) - **pool**: - Validate environment options when reusing the worker - by [@sheremet-va](https://github.com/sheremet-va) in [#9349](vitest-dev/vitest#9349) [<samp>(a8a88)</samp>](vitest-dev/vitest@a8a8836e3) - Handle worker start failures gracefully - by [@AriPerkkio](https://github.com/AriPerkkio) in [#9337](vitest-dev/vitest#9337) [<samp>(200da)</samp>](vitest-dev/vitest@200dadb32) - **reporter**: - Report test module if it failed to run - by [@sheremet-va](https://github.com/sheremet-va) in [#9272](vitest-dev/vitest#9272) [<samp>(c7888)</samp>](vitest-dev/vitest@c78882985) - **runner**: - Respect nested test.only within describe.only - by [@Ujjwaljain16](https://github.com/Ujjwaljain16) in [#9021](vitest-dev/vitest#9021) and [#9213](vitest-dev/vitest#9213) [<samp>(55d5d)</samp>](vitest-dev/vitest@55d5dad69) - **typecheck**: - Improve error message when tsc outputs help text - by [@Ujjwaljain16](https://github.com/Ujjwaljain16) in [#9214](vitest-dev/vitest#9214) [<samp>(7b10a)</samp>](vitest-dev/vitest@7b10ab4cd) - **ui**: - Detect gzip by magic numbers instead of Content-Type header in html reporter - by [@Copilot](https://github.com/Copilot), **hi-ogawa** and [@hi-ogawa](https://github.com/hi-ogawa) in [#9278](vitest-dev/vitest#9278) [<samp>(dd033)</samp>](vitest-dev/vitest@dd0331632) - **webdriverio**: - Fall back to WebDriver Classic [#9244](vitest-dev/vitest#9244) - by [@JustasMonkev](https://github.com/JustasMonkev) in [#9373](vitest-dev/vitest#9373) and [#9244](vitest-dev/vitest#9244) [<samp>(c23dd)</samp>](vitest-dev/vitest@c23dd11bd) ##### [View changes on GitHub](vitest-dev/vitest@v4.0.16...v4.0.17) </details> --- ### Configuration 📅 **Schedule**: Branch creation - Between 12:00 AM and 03:59 AM, on day 1 of the month ( * 0-3 1 * * ) (UTC), Automerge - Between 12:00 AM and 03:59 AM ( * 0-3 * * * ) (UTC). 🚦 **Automerge**: Enabled. ♻ **Rebasing**: Whenever PR is behind base branch, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this PR and you won't be reminded about these updates again. --- - [ ] If you want to rebase/retry this PR, check this box --- This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).  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Copilot AI assigned Copilot and sheremet-va Dec 22, 2025

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Copilot AI and others added 3 commits December 22, 2025 22:40

Add safety check for sample property access

e27de87

- Added 'in' operator check before accessing sample property on asymmetric matchers - Prevents potential runtime errors if sample property doesn't exist - Addresses code review feedback Co-authored-by: sheremet-va <[email protected]>

Copilot AI changed the title ~~[WIP] Improve diff readability for asymmetric matcher test results~~ Improve asymmetric matcher diff readability by unwrapping container matchers Dec 22, 2025

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refactor: simplify happy path

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refactor: moving around

80368bc

hi-ogawa changed the title ~~Improve asymmetric matcher diff readability by unwrapping container matchers~~ fix: improve asymmetric matcher diff readability by unwrapping container matchers Dec 24, 2025

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chore(deps): update dependency vitest to 4.0.18 stacksjs/eslint-plugin#72

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chore(deps): update vitest monorepo to v4.0.17 (patch) simonkberg/simon.dev#1504

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fix: improve asymmetric matcher diff readability by unwrapping container matchers#9330

fix: improve asymmetric matcher diff readability by unwrapping container matchers#9330
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