Enabling resetModules goes a step further and resets the module registry before running each individual test. resetModules īy default, each test file gets its own independent module registry. This will lead to any mocks having their fake implementations removed but does not restore their initial implementation. Equivalent to calling jest.resetAllMocks() before each test. A preset should point to an npm module that has a jest-preset.json, jest-preset.js, jest-preset.cjs or jest-preset.mjs file at the root.įor example, this preset foo-bar/jest-preset.js will be configured as follows:Īutomatically reset mock state before every test. failure-change: send a notification when tests fail or once when it passes.Ī preset that is used as a base for Jest's configuration.success-change: send a notification when tests pass or once when it fails.change: send a notification when the status changed.success: send a notification when tests pass.failure: send a notification when tests fail.Notifications will be properly displayed on subsequent runs. On Windows, node-notifier creates a new start menu entry on the first use and not display the notification. On macOS, remember to allow notifications from terminal-notifier under System Preferences > Notifications & Focus. ** Maximum number of recursive timers that will be run. ** Sets current system time to be used by fake timers. * Use the old fake timers implementation instead of one backed by The default is `false`. ** Whether fake timers should be enabled for all test files. * List of names of APIs that should not be faked. A custom time delta may be provided by passing a number. * If set to `true` all timers will be advanced automatically by 20 milliseconds coverageReporters ĭefault: Ī list of reporter names that Jest uses when writing coverage reports. Using the latest versions of node (v14 at the time of this writing) will yield better results. It is not as well tested, and it has also improved in the last few releases of Node. This uses V8's builtin code coverage rather than one based on Babel. Note that using v8 is considered experimental. Allowed values are babel (default) or v8. Indicates which provider should be used to instrument code for coverage. Use the string token to include the path to your project's root directory to prevent it from accidentally ignoring all of your files in different environments that may have different root directories. These pattern strings match against the full path. If the file path matches any of the patterns, coverage information will be skipped. coveragePathIgnorePatterns Īn array of regexp pattern strings that are matched against all file paths before executing the test. The directory where Jest should output its coverage files. Refer to the micromatch documentation to ensure your globs are compatible. Most likely your glob patterns are not matching any files. See the coverageProvider option for more details. Jest ships with two coverage providers: babel (default) and v8. Because this retrofits all executed files with coverage collection statements, it may significantly slow down your tests. Indicates whether the coverage information should be collected while executing the test. This does not remove any mock implementation that may have been provided. Equivalent to calling jest.clearAllMocks() before each test. clearMocks Īutomatically clear mock calls, instances, contexts and results before every test. This config option lets you customize where Jest stores that cache data on disk. Jest attempts to scan your dependency tree once (up-front) and cache it in order to ease some of the filesystem churn that needs to happen while running tests. The directory where Jest should store its cached dependency information. Setting bail to true is the same as setting bail to 1. The bail config option can be used here to have Jest stop running tests after n failures. bail īy default, Jest runs all tests and produces all errors into the console upon completion. They can be mocked explicitly, like jest.mock('fs'). Node.js core modules, like fs, are not mocked by default. Node modules are automatically mocked when you have a manual mock in place (e.g.: _mocks_/lodash.js). All modules used in your tests will have a replacement implementation, keeping the API surface. This option tells Jest that all imported modules in your tests should be mocked automatically.
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