Snapshot testing guide should mention caveats and how to overcome some of them #5812
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k-m-a-c
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Issue: jestjs#5812 Tools get even better when it's clear how they're meant to be used. Created a 'best practices' section where patterns that are known to improve the usefulness of Jest's snapshot feature can be explained for the community's benefit.
k-m-a-c
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Issue: jestjs#5812 Tools get even better when it's clear how they're meant to be used. Created a 'best practices' section where patterns that are known to improve the usefulness of Jest's snapshot feature can be explained for the community's benefit.
rickhanlonii
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* Add a 'best practices' section to the Snapshot Testing Guide: Issue: #5812 Tools get even better when it's clear how they're meant to be used. Created a 'best practices' section where patterns that are known to improve the usefulness of Jest's snapshot feature can be explained for the community's benefit. * Lint md * Updates based on feedback * Update language
This was referenced May 25, 2018
wopian
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May 25, 2018
This Pull Request updates dependency [jest](https://github.com/facebook/jest) from `~22.4.0` to `~23.0.0` <details> <summary>Release Notes</summary> ### [`v23.0.0`](https://github.com/facebook/jest/blob/master/CHANGELOG.md#​2300) [Compare Source](jestjs/jest@2745e3e...614f739) ##### Features * `[expect]` Expose `getObjectSubset`, `iterableEquality`, and `subsetEquality` ([#​6210](`jestjs/jest#6210)) * `[jest-snapshot]` Add snapshot property matchers ([#​6210](`jestjs/jest#6210)) * `[jest-config]` Support jest-preset.js files within Node modules ([#​6185](`jestjs/jest#6185)) * `[jest-cli]` Add `--detectOpenHandles` flag which enables Jest to potentially track down handles keeping it open after tests are complete. ([#​6130](`jestjs/jest#6130)) * `[jest-jasmine2]` Add data driven testing based on `jest-each` ([#​6102](`jestjs/jest#6102)) * `[jest-matcher-utils]` Change "suggest to equal" message to be more advisory ([#​6103](`jestjs/jest#6103)) * `[jest-message-util]` Don't ignore messages with `vendor` anymore ([#​6117](`jestjs/jest#6117)) * `[jest-validate]` Get rid of `jest-config` dependency ([#​6067](`jestjs/jest#6067)) * `[jest-validate]` Adds option to inject `deprecationEntries` ([#​6067](`jestjs/jest#6067)) * `[jest-snapshot]` [**BREAKING**] Concatenate name of test, optional snapshot name and count ([#​6015](`jestjs/jest#6015)) * `[jest-runtime]` Allow for transform plugins to skip the definition process method if createTransformer method was defined. ([#​5999](`jestjs/jest#5999)) * `[expect]` Add stack trace for async errors ([#​6008](`jestjs/jest#6008)) * `[jest-jasmine2]` Add stack trace for timeouts ([#​6008](`jestjs/jest#6008)) * `[jest-jasmine2]` Add stack trace for thrown non-`Error`s ([#​6008](`jestjs/jest#6008)) * `[jest-runtime]` Prevent modules from marking themselves as their own parent ([#​5235](`jestjs/jest#5235)) * `[jest-mock]` Add support for auto-mocking generator functions ([#​5983](`jestjs/jest#5983)) * `[expect]` Add support for async matchers ([#​5919](`jestjs/jest#5919)) * `[expect]` Suggest toContainEqual ([#​5948](`jestjs/jest#5953)) * `[jest-config]` Export Jest's default options ([#​5948](`jestjs/jest#5948)) * `[jest-editor-support]` Move `coverage` to `ProjectWorkspace.collectCoverage` ([#​5929](`jestjs/jest#5929)) * `[jest-editor-support]` Add `coverage` option to runner ([#​5836](`jestjs/jest#5836)) * `[jest-haste-map]` Support extracting dynamic `import`s ([#​5883](`jestjs/jest#5883)) * `[expect]` Improve output format for mismatchedArgs in mock/spy calls. ([#​5846](`jestjs/jest#5846)) * `[jest-cli]` Add support for using `--coverage` in combination with watch mode, `--onlyChanged`, `--findRelatedTests` and more ([#​5601](`jestjs/jest#5601)) * `[jest-jasmine2]` [**BREAKING**] Adds error throwing and descriptive errors to `it`/ `test` for invalid arguments. `[jest-circus]` Adds error throwing and descriptive errors to `it`/ `test` for invalid arguments ([#​5558](`jestjs/jest#5558)) * `[jest-matcher-utils]` Add `isNot` option to `matcherHint` function ([#​5512](`jestjs/jest#5512)) * `[jest-config]` Add `<rootDir>` to runtime files not found error report ([#​5693](`jestjs/jest#5693)) * `[expect]` Make toThrow matcher pass only if Error object is returned from promises ([#​5670](`jestjs/jest#5670)) * `[expect]` Add isError to utils ([#​5670](`jestjs/jest#5670)) * `[expect]` Add inverse matchers (`expect.not.arrayContaining`, etc., [#​5517](`jestjs/jest#5517)) * `[expect]` `expect.extend` now also extends asymmetric matchers ([#​5503](`jestjs/jest#5503)) * `[jest-mock]` Update `spyOnProperty` to support spying on the prototype chain ([#​5753](`jestjs/jest#5753)) * `[jest-mock]` Add tracking of return values in the `mock` property ([#​5752](`jestjs/jest#5752)) * `[jest-mock]` Add tracking of thrown errors in the `mock` property ([#​5764](`jestjs/jest#5764)) * `[expect]`Add nthCalledWith spy matcher ([#​5605](`jestjs/jest#5605)) * `[jest-cli]` Add `isSerial` property that runners can expose to specify that they can not run in parallel ([#​5706](`jestjs/jest#5706)) * `[expect]` Add `.toBeCalledTimes` and `toHaveBeenNthCalledWith` aliases ([#​5826](`jestjs/jest#5826)) * `[jest-cli]` Interactive Snapshot Mode improvements ([#​5864](`jestjs/jest#5864)) * `[jest-editor-support]` Add `no-color` option to runner ([#​5909](`jestjs/jest#5909)) * `[jest-jasmine2]` Pretty-print non-Error object errors ([#​5980](`jestjs/jest#5980)) * `[jest-message-util]` Include column in stack frames ([#​5889](`jestjs/jest#5889)) * `[expect]` Introduce toStrictEqual ([#​6032](`jestjs/jest#6032)) * `[expect]` Add return matchers ([#​5879](`jestjs/jest#5879)) * `[jest-cli]` Improve snapshot summaries ([#​6181](`jestjs/jest#6181)) * `[expect]` Include custom mock names in error messages ([#​6199](`jestjs/jest#6199)) * `[jest-diff]` Support returning diff from oneline strings ([#​6221](`jestjs/jest#6221)) * `[expect]` Improve return matchers ([#​6172](`jestjs/jest#6172)) * `[jest-cli]` Overhaul watch plugin hooks names ([#​6249](`jestjs/jest#6249)) * `[jest-mock]` Include tracked call results in serialized mock ([#​6244](`jestjs/jest#6244)) ##### Fixes * `[jest-cli]` Fix stdin encoding to utf8 for watch plugins. ([#​6253](`jestjs/jest#6253)) * `[expect]` Better detection of DOM Nodes for equality ([#​6246](`jestjs/jest#6246)) * `[jest-cli]` Fix misleading action description for F key when in "only failed tests" mode. ([#​6167](`jestjs/jest#6167)) * `[jest-worker]` Stick calls to workers before processing them ([#​6073](`jestjs/jest#6073)) * `[babel-plugin-jest-hoist]` Allow using `console` global variable ([#​6075](`jestjs/jest#6075)) * `[jest-jasmine2]` Always remove node core message from assert stack traces ([#​6055](`jestjs/jest#6055)) * `[expect]` Add stack trace when `expect.assertions` and `expect.hasAssertions` causes test failures. ([#​5997](`jestjs/jest#5997)) * `[jest-runtime]` Throw a more useful error when trying to require modules after the test environment is torn down ([#​5888](`jestjs/jest#5888)) * `[jest-mock]` [**BREAKING**] Replace timestamps with `invocationCallOrder` ([#​5867](`jestjs/jest#5867)) * `[jest-jasmine2]` Install `sourcemap-support` into normal runtime to catch runtime errors ([#​5945](`jestjs/jest#5945)) * `[jest-jasmine2]` Added assertion error handling inside `afterAll hook` ([#​5884](`jestjs/jest#5884)) * `[jest-cli]` Remove the notifier actions in case of failure when not in watch mode. ([#​5861](`jestjs/jest#5861)) * `[jest-mock]` Extend .toHaveBeenCalled return message with outcome ([#​5951](`jestjs/jest#5951)) * `[jest-runner]` Assign `process.env.JEST_WORKER_ID="1"` when in runInBand mode ([#​5860](`jestjs/jest#5860)) * `[jest-cli]` Add descriptive error message when trying to use `globalSetup`/`globalTeardown` file that doesn't export a function. ([#​5835](`jestjs/jest#5835)) * `[expect]` Do not rely on `instanceof RegExp`, since it will not work for RegExps created inside of a different VM ([#​5729](`jestjs/jest#5729)) * `[jest-resolve]` Update node module resolution algorithm to correctly handle symlinked paths ([#​5085](`jestjs/jest#5085)) * `[jest-editor-support]` Update `Settings` to use spawn in shell option ([#​5658](`jestjs/jest#5658)) * `[jest-cli]` Improve the error message when 2 projects resolve to the same config ([#​5674](`jestjs/jest#5674)) * `[jest-runtime]` remove retainLines from coverage instrumentation ([#​5692](`jestjs/jest#5692)) * `[jest-cli]` Fix update snapshot issue when using watchAll ([#​5696](`jestjs/jest#5696)) * `[expect]` Fix rejects.not matcher ([#​5670](`jestjs/jest#5670)) * `[jest-runtime]` Prevent Babel warnings on large files ([#​5702](`jestjs/jest#5702)) * `[jest-mock]` Prevent `mockRejectedValue` from causing unhandled rejection ([#​5720](`jestjs/jest#5720)) * `[pretty-format]` Handle React fragments better ([#​5816](`jestjs/jest#5816)) * `[pretty-format]` Handle formatting of `React.forwardRef` and `Context` components ([#​6093](`jestjs/jest#6093)) * `[jest-cli]` Switch collectCoverageFrom back to a string ([#​5914](`jestjs/jest#5914)) * `[jest-regex-util]` Fix handling regex symbols in tests path on Windows ([#​5941](`jestjs/jest#5941)) * `[jest-util]` Fix handling of NaN/Infinity in mock timer delay ([#​5966](`jestjs/jest#5966)) * `[jest-resolve]` Generalise test for package main entries equivalent to ".". ([#​5968](`jestjs/jest#5968)) * `[jest-config]` Ensure that custom resolvers are used when resolving the configuration ([#​5976](`jestjs/jest#5976)) * `[website]` Fix website docs ([#​5853](`jestjs/jest#5853)) * `[expect]` Fix isEqual Set and Map to compare object values and keys regardless of order ([#​6150](`jestjs/jest#6150)) * `[pretty-format]` [**BREAKING**] Remove undefined props from React elements ([#​6162](`jestjs/jest#6162)) * `[jest-haste-map]` Properly resolve mocked node modules without package.json defined ([#​6232](`jestjs/jest#6232)) ##### Chore & Maintenance * `[jest-runner]` Move sourcemap installation from `jest-jasmine2` to `jest-runner` ([#​6176](`jestjs/jest#6176)) * `[jest-cli]` Use yargs's built-in `version` instead of rolling our own ([#​6215](`jestjs/jest#6215)) * `[docs]` Add explanation on how to mock methods not implemented in JSDOM * `[jest-jasmine2]` Simplify `Env.execute` and TreeProcessor to setup and clean resources for the top suite the same way as for all of the children suites ([#​5885](`jestjs/jest#5885)) * `[babel-jest]` [**BREAKING**] Always return object from transformer ([#​5991](`jestjs/jest#5991)) * `[*]` Run Prettier on compiled output ([#​5858](`jestjs/jest#3497)) * `[jest-cli]` Add fileChange hook for plugins ([#​5708](`jestjs/jest#5708)) * `[docs]` Add docs on using `jest.mock(...)` ([#​5648](`jestjs/jest#5648)) * `[docs]` Mention Jest Puppeteer Preset ([#​5722](`jestjs/jest#5722)) * `[docs]` Add jest-community section to website ([#​5675](`jestjs/jest#5675)) * `[docs]` Add versioned docs for v22.4 ([##​5733](https://github.com/facebook/jest/pull/#​5733)) * `[docs]` Improve Snapshot Testing Guide ([#​5812](`jestjs/jest#5812)) * `[jest-runtime]` [**BREAKING**] Remove `jest.genMockFn` and `jest.genMockFunction` ([#​6173](`jestjs/jest#6173)) * `[jest-message-util]` Avoid adding unnecessary indent to blank lines in stack traces ([#​6211](`jestjs/jest#6211)) --- </details> --- This PR has been generated by [Renovate Bot](https://renovatebot.com).
wopian
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May 25, 2018
This Pull Request updates dependency [jest](https://github.com/facebook/jest) from `~22.4.0` to `~23.0.0` <details> <summary>Release Notes</summary> ### [`v23.0.0`](https://github.com/facebook/jest/blob/master/CHANGELOG.md#​2300) [Compare Source](jestjs/jest@2745e3e...v23.0.0) ##### Features * `[expect]` Expose `getObjectSubset`, `iterableEquality`, and `subsetEquality` ([#​6210](`jestjs/jest#6210)) * `[jest-snapshot]` Add snapshot property matchers ([#​6210](`jestjs/jest#6210)) * `[jest-config]` Support jest-preset.js files within Node modules ([#​6185](`jestjs/jest#6185)) * `[jest-cli]` Add `--detectOpenHandles` flag which enables Jest to potentially track down handles keeping it open after tests are complete. ([#​6130](`jestjs/jest#6130)) * `[jest-jasmine2]` Add data driven testing based on `jest-each` ([#​6102](`jestjs/jest#6102)) * `[jest-matcher-utils]` Change "suggest to equal" message to be more advisory ([#​6103](`jestjs/jest#6103)) * `[jest-message-util]` Don't ignore messages with `vendor` anymore ([#​6117](`jestjs/jest#6117)) * `[jest-validate]` Get rid of `jest-config` dependency ([#​6067](`jestjs/jest#6067)) * `[jest-validate]` Adds option to inject `deprecationEntries` ([#​6067](`jestjs/jest#6067)) * `[jest-snapshot]` [**BREAKING**] Concatenate name of test, optional snapshot name and count ([#​6015](`jestjs/jest#6015)) * `[jest-runtime]` Allow for transform plugins to skip the definition process method if createTransformer method was defined. ([#​5999](`jestjs/jest#5999)) * `[expect]` Add stack trace for async errors ([#​6008](`jestjs/jest#6008)) * `[jest-jasmine2]` Add stack trace for timeouts ([#​6008](`jestjs/jest#6008)) * `[jest-jasmine2]` Add stack trace for thrown non-`Error`s ([#​6008](`jestjs/jest#6008)) * `[jest-runtime]` Prevent modules from marking themselves as their own parent ([#​5235](`jestjs/jest#5235)) * `[jest-mock]` Add support for auto-mocking generator functions ([#​5983](`jestjs/jest#5983)) * `[expect]` Add support for async matchers ([#​5919](`jestjs/jest#5919)) * `[expect]` Suggest toContainEqual ([#​5948](`jestjs/jest#5953)) * `[jest-config]` Export Jest's default options ([#​5948](`jestjs/jest#5948)) * `[jest-editor-support]` Move `coverage` to `ProjectWorkspace.collectCoverage` ([#​5929](`jestjs/jest#5929)) * `[jest-editor-support]` Add `coverage` option to runner ([#​5836](`jestjs/jest#5836)) * `[jest-haste-map]` Support extracting dynamic `import`s ([#​5883](`jestjs/jest#5883)) * `[expect]` Improve output format for mismatchedArgs in mock/spy calls. ([#​5846](`jestjs/jest#5846)) * `[jest-cli]` Add support for using `--coverage` in combination with watch mode, `--onlyChanged`, `--findRelatedTests` and more ([#​5601](`jestjs/jest#5601)) * `[jest-jasmine2]` [**BREAKING**] Adds error throwing and descriptive errors to `it`/ `test` for invalid arguments. `[jest-circus]` Adds error throwing and descriptive errors to `it`/ `test` for invalid arguments ([#​5558](`jestjs/jest#5558)) * `[jest-matcher-utils]` Add `isNot` option to `matcherHint` function ([#​5512](`jestjs/jest#5512)) * `[jest-config]` Add `<rootDir>` to runtime files not found error report ([#​5693](`jestjs/jest#5693)) * `[expect]` Make toThrow matcher pass only if Error object is returned from promises ([#​5670](`jestjs/jest#5670)) * `[expect]` Add isError to utils ([#​5670](`jestjs/jest#5670)) * `[expect]` Add inverse matchers (`expect.not.arrayContaining`, etc., [#​5517](`jestjs/jest#5517)) * `[expect]` `expect.extend` now also extends asymmetric matchers ([#​5503](`jestjs/jest#5503)) * `[jest-mock]` Update `spyOnProperty` to support spying on the prototype chain ([#​5753](`jestjs/jest#5753)) * `[jest-mock]` Add tracking of return values in the `mock` property ([#​5752](`jestjs/jest#5752)) * `[jest-mock]` Add tracking of thrown errors in the `mock` property ([#​5764](`jestjs/jest#5764)) * `[expect]`Add nthCalledWith spy matcher ([#​5605](`jestjs/jest#5605)) * `[jest-cli]` Add `isSerial` property that runners can expose to specify that they can not run in parallel ([#​5706](`jestjs/jest#5706)) * `[expect]` Add `.toBeCalledTimes` and `toHaveBeenNthCalledWith` aliases ([#​5826](`jestjs/jest#5826)) * `[jest-cli]` Interactive Snapshot Mode improvements ([#​5864](`jestjs/jest#5864)) * `[jest-editor-support]` Add `no-color` option to runner ([#​5909](`jestjs/jest#5909)) * `[jest-jasmine2]` Pretty-print non-Error object errors ([#​5980](`jestjs/jest#5980)) * `[jest-message-util]` Include column in stack frames ([#​5889](`jestjs/jest#5889)) * `[expect]` Introduce toStrictEqual ([#​6032](`jestjs/jest#6032)) * `[expect]` Add return matchers ([#​5879](`jestjs/jest#5879)) * `[jest-cli]` Improve snapshot summaries ([#​6181](`jestjs/jest#6181)) * `[expect]` Include custom mock names in error messages ([#​6199](`jestjs/jest#6199)) * `[jest-diff]` Support returning diff from oneline strings ([#​6221](`jestjs/jest#6221)) * `[expect]` Improve return matchers ([#​6172](`jestjs/jest#6172)) * `[jest-cli]` Overhaul watch plugin hooks names ([#​6249](`jestjs/jest#6249)) * `[jest-mock]` Include tracked call results in serialized mock ([#​6244](`jestjs/jest#6244)) ##### Fixes * `[jest-cli]` Fix stdin encoding to utf8 for watch plugins. ([#​6253](`jestjs/jest#6253)) * `[expect]` Better detection of DOM Nodes for equality ([#​6246](`jestjs/jest#6246)) * `[jest-cli]` Fix misleading action description for F key when in "only failed tests" mode. ([#​6167](`jestjs/jest#6167)) * `[jest-worker]` Stick calls to workers before processing them ([#​6073](`jestjs/jest#6073)) * `[babel-plugin-jest-hoist]` Allow using `console` global variable ([#​6075](`jestjs/jest#6075)) * `[jest-jasmine2]` Always remove node core message from assert stack traces ([#​6055](`jestjs/jest#6055)) * `[expect]` Add stack trace when `expect.assertions` and `expect.hasAssertions` causes test failures. ([#​5997](`jestjs/jest#5997)) * `[jest-runtime]` Throw a more useful error when trying to require modules after the test environment is torn down ([#​5888](`jestjs/jest#5888)) * `[jest-mock]` [**BREAKING**] Replace timestamps with `invocationCallOrder` ([#​5867](`jestjs/jest#5867)) * `[jest-jasmine2]` Install `sourcemap-support` into normal runtime to catch runtime errors ([#​5945](`jestjs/jest#5945)) * `[jest-jasmine2]` Added assertion error handling inside `afterAll hook` ([#​5884](`jestjs/jest#5884)) * `[jest-cli]` Remove the notifier actions in case of failure when not in watch mode. ([#​5861](`jestjs/jest#5861)) * `[jest-mock]` Extend .toHaveBeenCalled return message with outcome ([#​5951](`jestjs/jest#5951)) * `[jest-runner]` Assign `process.env.JEST_WORKER_ID="1"` when in runInBand mode ([#​5860](`jestjs/jest#5860)) * `[jest-cli]` Add descriptive error message when trying to use `globalSetup`/`globalTeardown` file that doesn't export a function. ([#​5835](`jestjs/jest#5835)) * `[expect]` Do not rely on `instanceof RegExp`, since it will not work for RegExps created inside of a different VM ([#​5729](`jestjs/jest#5729)) * `[jest-resolve]` Update node module resolution algorithm to correctly handle symlinked paths ([#​5085](`jestjs/jest#5085)) * `[jest-editor-support]` Update `Settings` to use spawn in shell option ([#​5658](`jestjs/jest#5658)) * `[jest-cli]` Improve the error message when 2 projects resolve to the same config ([#​5674](`jestjs/jest#5674)) * `[jest-runtime]` remove retainLines from coverage instrumentation ([#​5692](`jestjs/jest#5692)) * `[jest-cli]` Fix update snapshot issue when using watchAll ([#​5696](`jestjs/jest#5696)) * `[expect]` Fix rejects.not matcher ([#​5670](`jestjs/jest#5670)) * `[jest-runtime]` Prevent Babel warnings on large files ([#​5702](`jestjs/jest#5702)) * `[jest-mock]` Prevent `mockRejectedValue` from causing unhandled rejection ([#​5720](`jestjs/jest#5720)) * `[pretty-format]` Handle React fragments better ([#​5816](`jestjs/jest#5816)) * `[pretty-format]` Handle formatting of `React.forwardRef` and `Context` components ([#​6093](`jestjs/jest#6093)) * `[jest-cli]` Switch collectCoverageFrom back to a string ([#​5914](`jestjs/jest#5914)) * `[jest-regex-util]` Fix handling regex symbols in tests path on Windows ([#​5941](`jestjs/jest#5941)) * `[jest-util]` Fix handling of NaN/Infinity in mock timer delay ([#​5966](`jestjs/jest#5966)) * `[jest-resolve]` Generalise test for package main entries equivalent to ".". ([#​5968](`jestjs/jest#5968)) * `[jest-config]` Ensure that custom resolvers are used when resolving the configuration ([#​5976](`jestjs/jest#5976)) * `[website]` Fix website docs ([#​5853](`jestjs/jest#5853)) * `[expect]` Fix isEqual Set and Map to compare object values and keys regardless of order ([#​6150](`jestjs/jest#6150)) * `[pretty-format]` [**BREAKING**] Remove undefined props from React elements ([#​6162](`jestjs/jest#6162)) * `[jest-haste-map]` Properly resolve mocked node modules without package.json defined ([#​6232](`jestjs/jest#6232)) ##### Chore & Maintenance * `[jest-runner]` Move sourcemap installation from `jest-jasmine2` to `jest-runner` ([#​6176](`jestjs/jest#6176)) * `[jest-cli]` Use yargs's built-in `version` instead of rolling our own ([#​6215](`jestjs/jest#6215)) * `[docs]` Add explanation on how to mock methods not implemented in JSDOM * `[jest-jasmine2]` Simplify `Env.execute` and TreeProcessor to setup and clean resources for the top suite the same way as for all of the children suites ([#​5885](`jestjs/jest#5885)) * `[babel-jest]` [**BREAKING**] Always return object from transformer ([#​5991](`jestjs/jest#5991)) * `[*]` Run Prettier on compiled output ([#​5858](`jestjs/jest#3497)) * `[jest-cli]` Add fileChange hook for plugins ([#​5708](`jestjs/jest#5708)) * `[docs]` Add docs on using `jest.mock(...)` ([#​5648](`jestjs/jest#5648)) * `[docs]` Mention Jest Puppeteer Preset ([#​5722](`jestjs/jest#5722)) * `[docs]` Add jest-community section to website ([#​5675](`jestjs/jest#5675)) * `[docs]` Add versioned docs for v22.4 ([##​5733](https://github.com/facebook/jest/pull/#​5733)) * `[docs]` Improve Snapshot Testing Guide ([#​5812](`jestjs/jest#5812)) * `[jest-runtime]` [**BREAKING**] Remove `jest.genMockFn` and `jest.genMockFunction` ([#​6173](`jestjs/jest#6173)) * `[jest-message-util]` Avoid adding unnecessary indent to blank lines in stack traces ([#​6211](`jestjs/jest#6211)) --- </details> --- This PR has been generated by [Renovate Bot](https://renovatebot.com).
This was referenced May 28, 2018
This was referenced May 28, 2018
calebeby
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May 30, 2018
This Pull Request updates dependency [jest](https://github.com/facebook/jest) from `v22.4.3` to `v23.0.1` <details> <summary>Release Notes</summary> ### [`v23.0.1`](https://github.com/facebook/jest/blob/master/CHANGELOG.md#​2301) [Compare Source](jestjs/jest@v23.0.0...3a3b4e3) ##### Chore & Maintenance * `[jest-jasemine2]` Add dependency on jest-each ([#​6308](`jestjs/jest#6308)) * `[jest-each]` Move jest-each into core Jest ([#​6278](`jestjs/jest#6278)) * `[examples]` Update typescript example to using ts-jest ([#​6260](`jestjs/jest#6260)) ##### Fixes * `[pretty-format]` Serialize inverse asymmetric matchers correctly ([#​6272](`jestjs/jest#6272)) --- ### [`v23.0.0`](https://github.com/facebook/jest/blob/master/CHANGELOG.md#​2300) [Compare Source](jestjs/jest@2745e3e...v23.0.0) ##### Features * `[expect]` Expose `getObjectSubset`, `iterableEquality`, and `subsetEquality` ([#​6210](`jestjs/jest#6210)) * `[jest-snapshot]` Add snapshot property matchers ([#​6210](`jestjs/jest#6210)) * `[jest-config]` Support jest-preset.js files within Node modules ([#​6185](`jestjs/jest#6185)) * `[jest-cli]` Add `--detectOpenHandles` flag which enables Jest to potentially track down handles keeping it open after tests are complete. ([#​6130](`jestjs/jest#6130)) * `[jest-jasmine2]` Add data driven testing based on `jest-each` ([#​6102](`jestjs/jest#6102)) * `[jest-matcher-utils]` Change "suggest to equal" message to be more advisory ([#​6103](`jestjs/jest#6103)) * `[jest-message-util]` Don't ignore messages with `vendor` anymore ([#​6117](`jestjs/jest#6117)) * `[jest-validate]` Get rid of `jest-config` dependency ([#​6067](`jestjs/jest#6067)) * `[jest-validate]` Adds option to inject `deprecationEntries` ([#​6067](`jestjs/jest#6067)) * `[jest-snapshot]` [**BREAKING**] Concatenate name of test, optional snapshot name and count ([#​6015](`jestjs/jest#6015)) * `[jest-runtime]` Allow for transform plugins to skip the definition process method if createTransformer method was defined. ([#​5999](`jestjs/jest#5999)) * `[expect]` Add stack trace for async errors ([#​6008](`jestjs/jest#6008)) * `[jest-jasmine2]` Add stack trace for timeouts ([#​6008](`jestjs/jest#6008)) * `[jest-jasmine2]` Add stack trace for thrown non-`Error`s ([#​6008](`jestjs/jest#6008)) * `[jest-runtime]` Prevent modules from marking themselves as their own parent ([#​5235](`jestjs/jest#5235)) * `[jest-mock]` Add support for auto-mocking generator functions ([#​5983](`jestjs/jest#5983)) * `[expect]` Add support for async matchers ([#​5919](`jestjs/jest#5919)) * `[expect]` Suggest toContainEqual ([#​5948](`jestjs/jest#5953)) * `[jest-config]` Export Jest's default options ([#​5948](`jestjs/jest#5948)) * `[jest-editor-support]` Move `coverage` to `ProjectWorkspace.collectCoverage` ([#​5929](`jestjs/jest#5929)) * `[jest-editor-support]` Add `coverage` option to runner ([#​5836](`jestjs/jest#5836)) * `[jest-haste-map]` Support extracting dynamic `import`s ([#​5883](`jestjs/jest#5883)) * `[expect]` Improve output format for mismatchedArgs in mock/spy calls. ([#​5846](`jestjs/jest#5846)) * `[jest-cli]` Add support for using `--coverage` in combination with watch mode, `--onlyChanged`, `--findRelatedTests` and more ([#​5601](`jestjs/jest#5601)) * `[jest-jasmine2]` [**BREAKING**] Adds error throwing and descriptive errors to `it`/ `test` for invalid arguments. `[jest-circus]` Adds error throwing and descriptive errors to `it`/ `test` for invalid arguments ([#​5558](`jestjs/jest#5558)) * `[jest-matcher-utils]` Add `isNot` option to `matcherHint` function ([#​5512](`jestjs/jest#5512)) * `[jest-config]` Add `<rootDir>` to runtime files not found error report ([#​5693](`jestjs/jest#5693)) * `[expect]` Make toThrow matcher pass only if Error object is returned from promises ([#​5670](`jestjs/jest#5670)) * `[expect]` Add isError to utils ([#​5670](`jestjs/jest#5670)) * `[expect]` Add inverse matchers (`expect.not.arrayContaining`, etc., [#​5517](`jestjs/jest#5517)) * `[expect]` `expect.extend` now also extends asymmetric matchers ([#​5503](`jestjs/jest#5503)) * `[jest-mock]` Update `spyOnProperty` to support spying on the prototype chain ([#​5753](`jestjs/jest#5753)) * `[jest-mock]` Add tracking of return values in the `mock` property ([#​5752](`jestjs/jest#5752)) * `[jest-mock]` Add tracking of thrown errors in the `mock` property ([#​5764](`jestjs/jest#5764)) * `[expect]`Add nthCalledWith spy matcher ([#​5605](`jestjs/jest#5605)) * `[jest-cli]` Add `isSerial` property that runners can expose to specify that they can not run in parallel ([#​5706](`jestjs/jest#5706)) * `[expect]` Add `.toBeCalledTimes` and `toHaveBeenNthCalledWith` aliases ([#​5826](`jestjs/jest#5826)) * `[jest-cli]` Interactive Snapshot Mode improvements ([#​5864](`jestjs/jest#5864)) * `[jest-editor-support]` Add `no-color` option to runner ([#​5909](`jestjs/jest#5909)) * `[jest-jasmine2]` Pretty-print non-Error object errors ([#​5980](`jestjs/jest#5980)) * `[jest-message-util]` Include column in stack frames ([#​5889](`jestjs/jest#5889)) * `[expect]` Introduce toStrictEqual ([#​6032](`jestjs/jest#6032)) * `[expect]` Add return matchers ([#​5879](`jestjs/jest#5879)) * `[jest-cli]` Improve snapshot summaries ([#​6181](`jestjs/jest#6181)) * `[expect]` Include custom mock names in error messages ([#​6199](`jestjs/jest#6199)) * `[jest-diff]` Support returning diff from oneline strings ([#​6221](`jestjs/jest#6221)) * `[expect]` Improve return matchers ([#​6172](`jestjs/jest#6172)) * `[jest-cli]` Overhaul watch plugin hooks names ([#​6249](`jestjs/jest#6249)) * `[jest-mock]` Include tracked call results in serialized mock ([#​6244](`jestjs/jest#6244)) ##### Fixes * `[jest-cli]` Fix stdin encoding to utf8 for watch plugins. ([#​6253](`jestjs/jest#6253)) * `[expect]` Better detection of DOM Nodes for equality ([#​6246](`jestjs/jest#6246)) * `[jest-cli]` Fix misleading action description for F key when in "only failed tests" mode. ([#​6167](`jestjs/jest#6167)) * `[jest-worker]` Stick calls to workers before processing them ([#​6073](`jestjs/jest#6073)) * `[babel-plugin-jest-hoist]` Allow using `console` global variable ([#​6075](`jestjs/jest#6075)) * `[jest-jasmine2]` Always remove node core message from assert stack traces ([#​6055](`jestjs/jest#6055)) * `[expect]` Add stack trace when `expect.assertions` and `expect.hasAssertions` causes test failures. ([#​5997](`jestjs/jest#5997)) * `[jest-runtime]` Throw a more useful error when trying to require modules after the test environment is torn down ([#​5888](`jestjs/jest#5888)) * `[jest-mock]` [**BREAKING**] Replace timestamps with `invocationCallOrder` ([#​5867](`jestjs/jest#5867)) * `[jest-jasmine2]` Install `sourcemap-support` into normal runtime to catch runtime errors ([#​5945](`jestjs/jest#5945)) * `[jest-jasmine2]` Added assertion error handling inside `afterAll hook` ([#​5884](`jestjs/jest#5884)) * `[jest-cli]` Remove the notifier actions in case of failure when not in watch mode. ([#​5861](`jestjs/jest#5861)) * `[jest-mock]` Extend .toHaveBeenCalled return message with outcome ([#​5951](`jestjs/jest#5951)) * `[jest-runner]` Assign `process.env.JEST_WORKER_ID="1"` when in runInBand mode ([#​5860](`jestjs/jest#5860)) * `[jest-cli]` Add descriptive error message when trying to use `globalSetup`/`globalTeardown` file that doesn't export a function. ([#​5835](`jestjs/jest#5835)) * `[expect]` Do not rely on `instanceof RegExp`, since it will not work for RegExps created inside of a different VM ([#​5729](`jestjs/jest#5729)) * `[jest-resolve]` Update node module resolution algorithm to correctly handle symlinked paths ([#​5085](`jestjs/jest#5085)) * `[jest-editor-support]` Update `Settings` to use spawn in shell option ([#​5658](`jestjs/jest#5658)) * `[jest-cli]` Improve the error message when 2 projects resolve to the same config ([#​5674](`jestjs/jest#5674)) * `[jest-runtime]` remove retainLines from coverage instrumentation ([#​5692](`jestjs/jest#5692)) * `[jest-cli]` Fix update snapshot issue when using watchAll ([#​5696](`jestjs/jest#5696)) * `[expect]` Fix rejects.not matcher ([#​5670](`jestjs/jest#5670)) * `[jest-runtime]` Prevent Babel warnings on large files ([#​5702](`jestjs/jest#5702)) * `[jest-mock]` Prevent `mockRejectedValue` from causing unhandled rejection ([#​5720](`jestjs/jest#5720)) * `[pretty-format]` Handle React fragments better ([#​5816](`jestjs/jest#5816)) * `[pretty-format]` Handle formatting of `React.forwardRef` and `Context` components ([#​6093](`jestjs/jest#6093)) * `[jest-cli]` Switch collectCoverageFrom back to a string ([#​5914](`jestjs/jest#5914)) * `[jest-regex-util]` Fix handling regex symbols in tests path on Windows ([#​5941](`jestjs/jest#5941)) * `[jest-util]` Fix handling of NaN/Infinity in mock timer delay ([#​5966](`jestjs/jest#5966)) * `[jest-resolve]` Generalise test for package main entries equivalent to ".". ([#​5968](`jestjs/jest#5968)) * `[jest-config]` Ensure that custom resolvers are used when resolving the configuration ([#​5976](`jestjs/jest#5976)) * `[website]` Fix website docs ([#​5853](`jestjs/jest#5853)) * `[expect]` Fix isEqual Set and Map to compare object values and keys regardless of order ([#​6150](`jestjs/jest#6150)) * `[pretty-format]` [**BREAKING**] Remove undefined props from React elements ([#​6162](`jestjs/jest#6162)) * `[jest-haste-map]` Properly resolve mocked node modules without package.json defined ([#​6232](`jestjs/jest#6232)) ##### Chore & Maintenance * `[jest-runner]` Move sourcemap installation from `jest-jasmine2` to `jest-runner` ([#​6176](`jestjs/jest#6176)) * `[jest-cli]` Use yargs's built-in `version` instead of rolling our own ([#​6215](`jestjs/jest#6215)) * `[docs]` Add explanation on how to mock methods not implemented in JSDOM * `[jest-jasmine2]` Simplify `Env.execute` and TreeProcessor to setup and clean resources for the top suite the same way as for all of the children suites ([#​5885](`jestjs/jest#5885)) * `[babel-jest]` [**BREAKING**] Always return object from transformer ([#​5991](`jestjs/jest#5991)) * `[*]` Run Prettier on compiled output ([#​5858](`jestjs/jest#3497)) * `[jest-cli]` Add fileChange hook for plugins ([#​5708](`jestjs/jest#5708)) * `[docs]` Add docs on using `jest.mock(...)` ([#​5648](`jestjs/jest#5648)) * `[docs]` Mention Jest Puppeteer Preset ([#​5722](`jestjs/jest#5722)) * `[docs]` Add jest-community section to website ([#​5675](`jestjs/jest#5675)) * `[docs]` Add versioned docs for v22.4 ([#​5733](`jestjs/jest#5733)) * `[docs]` Improve Snapshot Testing Guide ([#​5812](`jestjs/jest#5812)) * `[jest-runtime]` [**BREAKING**] Remove `jest.genMockFn` and `jest.genMockFunction` ([#​6173](`jestjs/jest#6173)) * `[jest-message-util]` Avoid adding unnecessary indent to blank lines in stack traces ([#​6211](`jestjs/jest#6211)) --- ### [`v22.4.4`](jestjs/jest@6851d8b...v22.4.4) [Compare Source](jestjs/jest@6851d8b...v22.4.4) --- </details> --- This PR has been generated by [Renovate Bot](https://renovatebot.com).
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Do you want to request a feature or report a bug?
Feature
What is the expected behavior?
We should add a
CaveatsorTradeoffsheading explaining common mistakes and misuses of snapshot testing and how to overcome them, e.g. with ESLint no-large-snapshots rule.You'll find some context in this twitter thread.
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