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Part of ChromeDevTools#2639. Moves the format/quality and element handle disposal tests in tests/tools/screenshot.test.ts from a real browser to createHandlerMocks and asserts the exact page.screenshot, element.screenshot, dispose and response calls with sinon.assert.
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A couple of minor improvements:
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tests/tools/screenshot.test.ts(disposes the element handle ..., both cases): addsinon.assert.notCalled(page.pptrPage.screenshot). It pins that the element branch was taken rather than the page branch, which the old real-browser version implied by capturing an actual element. -
tests/tools/screenshot.test.ts(with jpeg): the old test ran JPEG with noqualityfrom either the request or the CLI; that branch (quality: undefinedfor a lossy format) is now uncovered. Either keepwith jpegwithoutqualityand move thequality: 50forwarding into its own case, or accept the gap; it is a one-line branch.
Keep the jpeg case without any quality, as the real-browser test had, and move the quality forwarding check into its own case. Assert that page.screenshot is not called in the element handle disposal tests.
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Thanks! Done in 0b0455a: both disposal tests now assert |
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## Summary Add a **Pre-submit checklist** section to `AGENTS.md`. Each item comes from a recent review finding or a landed bug fix in this repository. The checklist has five groups: - **Scope and PR description**: one change per PR, title and commit type match, description lists every behavior change and matches the diff, `npm run gen` and `npm run format` ran. - **Design**: fix in the lowest layer that owns the data, fix upstream (Puppeteer, devtools-frontend) first, one helper for repeated code, options objects instead of positional `undefined` arguments, validation in Zod schemas. - **Correctness and edge cases**: no stale state after a failed call, artifacts written before a throw, abandoned async continuations, mutex guards, file removal races, `dispose()` releases every resource, secrets never reach logs, path parameters validated even when they parse as URLs. - **Tests**: every new function has a test, no vacuous assertions, `notCalled` targets the first call after validation, exact-argument assertions, reusable stubs in `tests/mocks.ts`, bounded timeouts, no second CDP session for event waits. - **Documentation and output**: tool descriptions state when a parameter is ignored, skills stay generic, one-sentence inline comments. Sources: review comments on ChromeDevTools#2679, ChromeDevTools#2797, ChromeDevTools#2859, ChromeDevTools#2881, ChromeDevTools#2901, ChromeDevTools#3048, ChromeDevTools#3082, ChromeDevTools#3109, ChromeDevTools#3120, ChromeDevTools#3132, ChromeDevTools#3134, ChromeDevTools#3139, ChromeDevTools#3148, ChromeDevTools#3156, ChromeDevTools#3158, ChromeDevTools#3161, ChromeDevTools#3182, ChromeDevTools#3183, ChromeDevTools#3186, ChromeDevTools#3187, ChromeDevTools#3188, ChromeDevTools#3189, ChromeDevTools#3192, ChromeDevTools#3196, ChromeDevTools#3197, ChromeDevTools#3198, ChromeDevTools#3203, ChromeDevTools#3204, and fixes ChromeDevTools#3150, ChromeDevTools#3160, ChromeDevTools#3185, ChromeDevTools#3202, ChromeDevTools#3207, ChromeDevTools#3208. Existing content in `AGENTS.md` is unchanged. Closes ChromeDevTools#3222
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2 participants
Part of #2639.
Five
take_screenshothandler tests launched a real browser only to check which arguments reachpage.screenshot/ the element handle and what ends up in the response. This migrates them in place tocreateHandlerMocksand asserts the exact calls withsinon.assert, followingAGENTS.md:ignores quality: asserts a PNG capture is requested withquality: undefinedeven whenquality: 0is passed, plus the response line and the attachedimage/pngdata.with jpeg: asserts the requestedqualityis forwarded topage.screenshotwithtype: 'jpeg', and the image is attached asimage/jpeg.with webp: asserts the--screenshot-qualityCLI value is used when noqualityparam is given, and the image is attached asimage/webp.disposes the element handle after an element screenshot/when the capture fails: usecreateMockElementHandle()instead of spying on a real handle, and assertdisposeis called once in both the success and the rejection path (and no image is attached on failure).Kept on the real browser:
with default options,with full page,with element uid,with filePath: the end-to-end checks that a real capture/file write works.downscales .../honors screenshotMaxWidth .../does not resize ...tests: they check real pixel sizes; the clip math is already covered by the mock tests in thedownscale clipblock.with unwritable filePathandwith malformed filePath: they are currently the only tests that exercise the realMcpContext.saveFilewrite failure, so moving them belongs withtests/McpContext.test.tsrather than here.honors screenshotFormat default from CLI args: left untouched because chore: declare type on properties #3082 edits the same lines.Testing
npm run build && NODE_TEST_REPORTER=spec node scripts/test.js tests/tools/screenshot.test.ts: all migrated tests pass; each now takes about 30–100 ms instead of about 80–700 ms. (On my Windows machinewith full page resulting in a large screenshotfails withPage is too largeboth before and after this change; it is not touched here.)qualityfor PNG, dropping the requestquality, dropping thescreenshotQualityfallback, hard-coding theimage/pngMIME type, and skipping theusingdisposal of the element handle each make the corresponding migrated test(s) fail.eslintandprettierare clean; onlytests/tools/screenshot.test.tschanges.