Default: (/__tests__/.*|(\\.|/)(test|spec))\\.[jt]sx?$. 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. With the two together, files in /node_modules/bar/ will not be transformed because it does match the second pattern, even though it was excluded by the first. For example, imagine we want to use the field "module" if it is present, otherwise fallback to "main": Automatically restore mock state and implementation before every test. // Call the defaultResolver, so we leverage its cache, error handling, etc. */, /** Whether to retain all files, allowing e.g. This config option lets you customize where Jest stores that cache data on disk. In addition, the globals object must be json-serializable, so it can't be used to specify global functions. /** @type {import('ts-jest/dist/types').InitialOptionsTsJest} */, 'jest-preset-angular/presets/defaults-esm', Cannot find module '@angular/common/locales/xx' from 'src/app/app.component.spec.ts', Potential issues with Angular 13 ESM package format and workaround, Usage with Angular libraries which are built with Angular CLI 13. For example, you may hide coverage report lines for all fully-covered files: For more information about the options object shape refer to CoverageReporterWithOptions type in the type definitions. one directory up, the
A number limiting the number of tests that are allowed to run at the same time when using test.concurrent. Besides, the changes in Angular packages themselves, Angular libraries which are built with Angular CLI 13 also introduce By default, Jest runs all tests and produces all errors into the console upon completion.
If a given module's path matches any of the patterns, it will not be require()-able in the test environment. It is a part of default reporter, hence it will be enabled if 'default' is included in the list. These pattern strings match against the full path. These patterns match against the full path. Keep in mind that a transformer only runs once per file unless the file has changed. Whereas a reporter has the ability to receive test results after individual tests and/or test suites are finished. a function expecting a string as the first argument for the path to resolve and an options object as the second argument. This might be useful to fetch some data asynchronously. A list of paths to snapshot serializer modules Jest should use for snapshot testing.
Default: {escapeString: false, printBasicPrototype: false}. The values in the watchPlugins property value can omit the jest-watch- prefix of the package name. You can have an unlimited amount of projects running in the same Jest instance. If you require modules without specifying a file extension, these are the extensions Jest will look for, in left-to-right order. Note that if there is only one test file being run it will default to true. A preset that is used as a base for Jest's configuration. Starting from v11.0.0, jest-preset-angular introduces a few extra changes to be able to run Jest with Angular 13: moduleFileExtensions is updated to include mjs files as accepted module format. It is recommended to define the configuration in a dedicated JavaScript, TypeScript or JSON file. While code transformation is applied to the linked setup-file, Jest will not transform any code in node_modules. The second pattern will match (and therefore not transform) files inside any path with /bar/ in it. Automatically clear mock calls, instances, contexts and results before every test. For example, if you have tests in source files named with .t.js extension as following: You can collect coverage from those files with setting forceCoverageMatch. search for tests in `node_modules`. Each setupFile will be run once per test file. Make sure to restart your IDE and dev server if the error still persists. */, /** List of `require.paths` to use if nothing is found in `node_modules`. * This options cannot be used in projects which use watchman. Activates native OS notifications for test results. Setting this option will override the default, if you wish to still search node_modules for packages include it along with any other options: Default: ["js", "mjs", "cjs", "jsx", "ts", "tsx", "json", "node"]. Providing regexp patterns that overlap with each other may result in files not being transformed that you expected to be transformed. This config option lets you customize where Jest stores snapshot files on disk. This is true for arrays of module names as well. resolver is also excluded from our default and default ESM presets. This example configuration will run Jest in the root directory as well as in every folder in the examples directory. A custom time delta may be provided by passing a number. An array of regexp pattern strings that are matched against all modules before the module loader will automatically return a mock for them. A map from regular expressions to paths to transformers. This uses V8's builtin code coverage rather than one based on Babel. installed all dependencies by running the npm install command, set the Note that it must be parseable by JSON.parse. currently supports testing with Jest in CommonJS mode with Angular 13 using default preset. Having the test framework installed makes Jest globals, jest object and expect accessible in the modules. */, /** List of file extensions to search in order. For example, you may sort test paths alphabetically: Add custom-sequencer to your Jest configuration: Default timeout of a test in milliseconds. The baseUrl option lets us More info here. printer is a function that serializes a value using existing plugins.
*/, /** Maximum number of recursive timers that will be run. An array of regexp pattern strings that are matched against all source file paths before transformation. Both jest-environment-jsdom and jest-environment-node allow specifying customExportConditions, which allow you to control which versions of a library are loaded from exports in package.json.
By default, roots has a single entry
jest-environment-jsdom defaults to ['browser']. This option allows you to use a custom runner instead of Jest's default test runner. The configuration also can be stored in a JSON file as a plain object: Alternatively Jest's configuration can be defined through the "jest" key in the package.json of your project: You can retrieve Jest's defaults from jest-config to extend them if needed: This option tells Jest that all imported modules in your tests should be mocked automatically. If the file is an ESM module, simply use top-level await to achieve the same result. Thresholds specified as a positive number are taken to be the minimum percentage required.
Both sort and shard may optionally return a Promise. jest-preset-angular Requires notify: true. Examples of runners include: The runner property value can omit the jest-runner- prefix of the package name. with the dependencies found in the code. To fix this issue, one should modify transformIgnorePatterns to be as following: If you like jest-preset-angular, give it a star on. libraries in Jest CommonJS mode. The following is a visualization of the default regex: testRegex will try to detect test files using the absolute file path, therefore, having a folder with a name that matches it will run all the files as tests. : __mocks__/lodash.js). The module must export a class with setup, teardown and getVmContext methods. It is not as well tested, and it has also improved in the last few releases of Node. For this purpose, you can pass an array of configuration objects. /** @returns {Promise
The directory where Jest should output its coverage files. If the file path matches any of the patterns, it will not be transformed. your IDE. Example: ["
If the file path matches any of the patterns, when it is updated, it will not trigger a re-run of tests.
Add "text" or "text-summary" to see a coverage summary in the console output. Note that using v8 is considered experimental. relay will replace all modules which contain relay as a substring in its name: relay, react-relay and graphql-relay will all be pointed to your stub. To overcome this, you may use transformIgnorePatterns to allow transpiling such modules. A list of paths to modules that run some code to configure or set up the testing environment. If the pragma does not have a value, it will be present in the object with its value set to an empty string. Indicates whether the coverage information should be collected while executing the test.
Built with Docusaurus. In other words, setupFilesAfterEnv modules are meant for code which is repeating in each test file. If you are building a web app, you can use a browser-like environment through jsdom instead.
You can also pass variables from this module to your test suites by assigning them to this.global object this will make them available in your test suites as global variables.
There are times where you only want Jest to search in a single sub-directory (such as cases where you have a src/ directory in your repo), but prevent it from accessing the rest of the repo.
/** Directory to begin resolving from.
If you still get the error, try to delete your node_modules and 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. Any global variables that are defined through globalSetup can only be read in globalTeardown. Component.test.js or Component.spec.js). It takes the same arguments as your custom synchronous one, e.g. For more information, you can view the istanbuljs documentation and the c8 documentation. When the projects configuration is provided with an array of paths or glob patterns, Jest will run tests in all of the specified projects at the same time.
Use this configuration option to add reporters to Jest. (x)" ]).
Alternatively, an object with the properties name and color can be passed. The default is `[]`, meaning, /** Whether fake timers should be enabled for all test files. Each glob pattern is applied in the order they are specified in the config. displayName defaults to white when its value is a string. Jest runs the code of your project as JavaScript, hence a transformer is needed if you use some syntax not supported by Node out of the box (such as JSX, TypeScript, Vue templates). Jest will call the function and await its result. In order to make the negated glob work in this example it has to come after **/*.js. Using '
The fake timers may be useful when a piece of code sets a long timeout that we don't want to wait for in a test. into the global environment. Default: The root of the directory containing your Jest config file or the package.json or the pwd if no package.json is found. If you have any other files that should run with native ESM, you need to specify their file extension here. A list of paths to modules that run some code to configure or set up the testing framework before each test file in the suite is executed. In addition, babel-jest will inject the Babel plugin necessary for mock hoisting talked about in ES Module mocking. // Scan the file and add dependencies in `deps` (which is a `Set`), // install fake timers for this file using the options from Jest configuration, 'increase the limit of recursive timers for this and following tests', * If set to `true` all timers will be advanced automatically by 20 milliseconds.
It will also find files called test.js or spec.js. This option allows the use of a custom results processor. */, /** List of directory names to be looked up for modules recursively. For additional details see Fake Timers guide and API documentation. The function should either return a path to the module that should be resolved or throw an error if the module can't be found. Open your terminal in your project's root directory (where your package.json This option allows the use of a custom global setup module, which must export a function (it can be sync or async). For example, you can tell Jest to keep the original implementation of process.nextTick() and adjust the limit of recursive timers that will be run: Instead of including jest.useFakeTimers() in each test file, you can enable fake timers globally for all tests in your Jest configuration: For some reason you might have to use legacy implementation of fake timers. This option has no effect if you use native ESM. If you still get the error, try to update the versions of your NPM packages by // Set reference to mongod in order to close the server during teardown. To solve the error "Cannot find module '@angular/core'", make sure you have Indicates whether each individual test should be reported during the run. The function will be triggered once after all test suites and it will receive two arguments: Jest's globalConfig and projectConfig.
If a file matches the specified glob pattern, coverage information will be collected for it even if no tests exist for this file and it's never required in the test suite. For example, the following would create a global __DEV__ variable set to true in all test environments: Note that, if you specify a global reference value (like an object or array) here, and some code mutates that value in the midst of running a test, that mutation will not be persisted across test runs for other test files. VSCode often glitches and a reboot solves things sometimes.
For that, you should use setupFiles. For example, if you want a setupFiles entry to point at the some-setup.js file at the root of the project, set its value to: '
For example, if your tests call Math often, you can pass it by setting sandboxInjectedGlobals. For example, with the following configuration jest will fail if there is less than 80% branch, line, and function coverage, or if there are more than 10 uncovered statements: If globs or paths are specified alongside global, coverage data for matching paths will be subtracted from overall coverage and thresholds will be applied independently. You can use --config flag to pass an explicit path to the file. The babel and v8 coverage providers use /* istanbul ignore next */ and /* c8 ignore next */ comments to exclude lines from coverage reports, respectively. In watch mode, this defaults to half of the available cores on your machine to ensure Jest is unobtrusive and does not grind your machine to a halt. (This could be tsconfig.json or For environments with variable CPUs available, you can use percentage based configuration: An array of directory names to be searched recursively up from the requiring module's location. An array of file extensions your modules use. The default is `100_000` timers. Refer to the micromatch documentation to ensure your globs are compatible. Notifications will be properly displayed on subsequent runs.
*/, /** Allows transforms a path within a package. Copyright 2022 Facebook, Inc. */. Built with Docusaurus.
Allows overriding specific snapshot formatting options documented in the pretty-format readme, with the exceptions of compareKeys and plugins. This does not change the exit code in the case of Jest errors (e.g.
Using the latest versions of node (v14 at the time of this writing) will yield better results. */, 'options for this reporter from Jest config: ', 'reporter context passed from test scheduler: ', // Optionally, reporters can force Jest to exit with non zero code by returning.
If the file path matches any of the patterns, coverage information will be skipped.
baseUrl option to src in your tsconfig.json file and restart your IDE and */, /** Whether to throw on error on module collision. It will also find files called test.js or spec.js. Thresholds specified as a negative number represent the maximum number of uncovered entities allowed. For example, you can add extra matchers from jest-extended library or call setup and teardown hooks: The number of seconds after which a test is considered as slow and reported as such in the results. Specifies the maximum number of workers the worker-pool will spawn for running tests. More about serializers API can be found here. Optionally, a tuple with configuration options can be passed as second argument: {filePattern: ['path-to-transformer', {options}]}. Useful for easing the upgrade process. Sets the path to the prettier node module used to update inline snapshots. To use this class as your custom environment, refer to it by its full path within the project. transform is updated to include .mjs extension to transform to CommonJS codes.
A set of global variables that need to be available in all test environments.
The class may optionally expose an asynchronous handleTestEvent method to bind to events fired by jest-circus. A list of paths to directories that Jest should use to search for files in. Equivalent to calling jest.restoreAllMocks() before each test. Angular 13 introduces ESM package format for Angular packages. This will be used to configure minimum threshold enforcement for coverage results. development server. Oftentimes, you'll want to set this to 'src' or 'lib', corresponding to where in your repository the code is stored. Since setupFiles executes before the test framework is installed in the environment, this script file presents you the opportunity of running some code immediately after the test framework has been installed in the environment but before the test code itself. **/__tests__/**", "**/*.js"] will not exclude __tests__ because the negation is overwritten with the second pattern. Any istanbul reporter can be used. This will lead to any mocks having their fake implementations removed and restores their initial implementation.
Test files run inside a vm, which slows calls to global context properties (e.g. The default is `false`. An array of regexp pattern strings that are matched against all file paths before executing the test. Thresholds for globs are applied to all files matching the glob.
For example, to run both tests and ESLint (via jest-runner-eslint) in the same invocation of Jest: When using multi-project runner, it's recommended to add a displayName for each project. See also testMatch [array
Thresholds can be specified as global, as a glob, and as a directory or file path.
This will collect coverage information for all the files inside the project's rootDir, except the ones that match **/node_modules/** or **/vendor/**.
For instance, you might want to use it as stand-alone reporter instead of the default one, or together with Silent Reporter: Hungry for reporters? With this option, you can overwrite this behavior and include otherwise ignored files in code coverage. Indicates which provider should be used to instrument code for coverage. All modules used in your tests will have a replacement implementation, keeping the API surface. Equivalent to calling jest.resetAllMocks() before each test. Test environment options that will be passed to the testEnvironment. Enabling resetModules goes a step further and resets the module registry before running each individual test.
One difference is that a test result processor only gets called after all tests finished. Math). This is due to the need to load the actual transformers (e.g. * Whether to follow symlinks when crawling for files. Default: ["clover", "json", "lcov", "text"]. The default is `Date.now()`. Because this retrofits all executed files with coverage collection statements, it may significantly slow down your tests. Similar to Angular packages, Jest doesn't understand .mjs files which are in these new format [jt]sx?$/ RegExp (in other words, any .js, .jsx, .ts or .tsx file). This applies also when searching for manual mocks for modules from node_modules (__mocks__ will need to live in one of the roots). 'ios'. It's generally a best practice to keep this list as small as possible and always use explicit jest.mock()/jest.unmock() calls in individual tests.