fix(expect): support constructors in expect.arrayOf

[Pavel Feldman (pavelfeldman)]

Summary

• expect.arrayOf(String) / expect.arrayOf(MyClass) now match by type, as documented, by treating a constructor as expect.any(constructor).

Fixes #43117

[github-actions]

Test results for "tests 1"

4 flaky

⚠️ [chromium-library] › library/webmcp.spec.ts:256 › should list and call tools in cross-origin and nested frames `@chromium-ubuntu-22.04-node20`
⚠️ [firefox-library] › library/browsercontext-cookies-third-party.spec.ts:257 › third party 'Partitioned;' cookies `@firefox-ubuntu-22.04-node20`
⚠️ [firefox-library] › library/browsercontext-cookies-third-party.spec.ts:470 › top level 'Partitioned;' cookie and same origin iframe `@firefox-ubuntu-22.04-node20`
⚠️ [webkit-page] › page/page-set-input-files.spec.ts:38 › should upload a folder `@webkit-ubuntu-22.04-node20`

52511 passed, 1268 skipped

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Merge workflow run.

[github-actions]

Test results for "MCP"

1 failed
❌ [firefox] › mcp/cli-devtools.spec.ts:140 › request* and response* commands support --filename @mcp-windows-latest-firefox

9034 passed, 1495 skipped

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Merge workflow run.

[github-actions]

🟢 Green — the failure is a confirmed pre-existing flake

Hi, I'm the Playwright bot and I took a first look at the CI failure here.

The only real failure is [firefox] › mcp/cli-devtools.spec.ts:140 › request* and response* commands support --filename on Windows. The same test has failed with the same assertion on several unrelated PRs, while this PR only changes expect.arrayOf constructor matching and its test coverage.

Details

The PR changes packages/playwright/src/matchers/expectLibrary.ts and tests/playwright-test/expect.spec.ts; it does not reach the MCP devtools CLI, Firefox request handling, or the failing test.

Pre-existing flake / infra

• [firefox] › mcp/cli-devtools.spec.ts:140 › request* and response* commands support --filename (mcp-windows-latest-firefox) — the click timed out while waiting for the POST request to complete, so requests did not contain the expected entry and expect(match).not.toBeNull() failed. The same Windows/Firefox test and assertion have failed on unrelated PRs including fix(test): support multiple contexts with --debug=cli #42503, fix(frames): treat elements inside hidden iframes as hidden #42884, docs(request): list all resource types in resourceType() #42997, and chore(coverage): hide public coverage tracing options before release #43030. Prior aggregated test-results data also shows this test passing in hundreds of runs and intermittently failing only on this bot.

_{Triaged by the Playwright bot - agent run}