/**
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* The `node:test` module provides a standalone testing module.
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* @see [source](https://github.com/nodejs/node/blob/v18.x/lib/test.js)
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*/
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declare module 'node:test' {
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/**
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* Programmatically start the test runner.
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* @since v18.9.0
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* @param options Configuration options for running tests.
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* @returns A {@link TapStream} that emits events about the test execution.
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*/
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function run(options?: RunOptions): TapStream;
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/**
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* The `test()` function is the value imported from the test module. Each invocation of this
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* function results in the creation of a test point in the TAP output.
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*
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* The {@link TestContext} object passed to the fn argument can be used to perform actions
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* related to the current test. Examples include skipping the test, adding additional TAP
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* diagnostic information, or creating subtests.
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*
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* `test()` returns a {@link Promise} that resolves once the test completes. The return value
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* can usually be discarded for top level tests. However, the return value from subtests should
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* be used to prevent the parent test from finishing first and cancelling the subtest as shown
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* in the following example.
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*
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* ```js
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* test('top level test', async (t) => {
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* // The setTimeout() in the following subtest would cause it to outlive its
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* // parent test if 'await' is removed on the next line. Once the parent test
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* // completes, it will cancel any outstanding subtests.
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* await t.test('longer running subtest', async (t) => {
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* return new Promise((resolve, reject) => {
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* setTimeout(resolve, 1000);
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* });
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* });
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* });
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* ```
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* @since v18.0.0
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* @param name The name of the test, which is displayed when reporting test results.
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* Default: The `name` property of fn, or `'<anonymous>'` if `fn` does not have a name.
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* @param options Configuration options for the test
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* @param fn The function under test. The first argument to this function is a
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* {@link TestContext} object. If the test uses callbacks, the callback function is
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* passed as the second argument. Default: A no-op function.
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* @returns A {@link Promise} resolved with `undefined` once the test completes.
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*/
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function test(name?: string, fn?: TestFn): Promise<void>;
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function test(name?: string, options?: TestOptions, fn?: TestFn): Promise<void>;
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function test(options?: TestOptions, fn?: TestFn): Promise<void>;
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function test(fn?: TestFn): Promise<void>;
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/**
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* @since v18.6.0
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* @param name The name of the suite, which is displayed when reporting suite results.
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* Default: The `name` property of fn, or `'<anonymous>'` if `fn` does not have a name.
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* @param options Configuration options for the suite
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* @param fn The function under suite. Default: A no-op function.
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*/
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function describe(name?: string, options?: TestOptions, fn?: SuiteFn): void;
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function describe(name?: string, fn?: SuiteFn): void;
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function describe(options?: TestOptions, fn?: SuiteFn): void;
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function describe(fn?: SuiteFn): void;
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namespace describe {
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// Shorthand for skipping a suite, same as `describe([name], { skip: true }[, fn])`.
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function skip(name?: string, options?: TestOptions, fn?: SuiteFn): void;
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function skip(name?: string, fn?: SuiteFn): void;
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function skip(options?: TestOptions, fn?: SuiteFn): void;
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function skip(fn?: SuiteFn): void;
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// Shorthand for marking a suite as `TODO`, same as `describe([name], { todo: true }[, fn])`.
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function todo(name?: string, options?: TestOptions, fn?: SuiteFn): void;
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function todo(name?: string, fn?: SuiteFn): void;
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function todo(options?: TestOptions, fn?: SuiteFn): void;
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function todo(fn?: SuiteFn): void;
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}
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/**
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* @since v18.6.0
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* @param name The name of the test, which is displayed when reporting test results.
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* Default: The `name` property of fn, or `'<anonymous>'` if `fn` does not have a name.
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* @param options Configuration options for the test
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* @param fn The function under test. If the test uses callbacks, the callback function is
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* passed as the second argument. Default: A no-op function.
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*/
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function it(name?: string, options?: TestOptions, fn?: ItFn): void;
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function it(name?: string, fn?: ItFn): void;
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function it(options?: TestOptions, fn?: ItFn): void;
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function it(fn?: ItFn): void;
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namespace it {
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// Shorthand for skipping a test, same as `it([name], { skip: true }[, fn])`.
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function skip(name?: string, options?: TestOptions, fn?: ItFn): void;
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function skip(name?: string, fn?: ItFn): void;
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function skip(options?: TestOptions, fn?: ItFn): void;
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function skip(fn?: ItFn): void;
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// Shorthand for marking a test as `TODO`, same as `it([name], { todo: true }[, fn])`.
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function todo(name?: string, options?: TestOptions, fn?: ItFn): void;
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function todo(name?: string, fn?: ItFn): void;
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function todo(options?: TestOptions, fn?: ItFn): void;
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function todo(fn?: ItFn): void;
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}
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/**
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* The type of a function under test. The first argument to this function is a
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* {@link TestContext} object. If the test uses callbacks, the callback function is passed as
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* the second argument.
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*/
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type TestFn = (t: TestContext, done: (result?: any) => void) => any;
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/**
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* The type of a function under Suite.
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* If the test uses callbacks, the callback function is passed as an argument
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*/
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type SuiteFn = (done: (result?: any) => void) => void;
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/**
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* The type of a function under test.
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* If the test uses callbacks, the callback function is passed as an argument
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*/
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type ItFn = (done: (result?: any) => void) => any;
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interface RunOptions {
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/**
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* If a number is provided, then that many files would run in parallel.
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* If truthy, it would run (number of cpu cores - 1) files in parallel.
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* If falsy, it would only run one file at a time.
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* If unspecified, subtests inherit this value from their parent.
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* @default true
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*/
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concurrency?: number | boolean | undefined;
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/**
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* An array containing the list of files to run.
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* If unspecified, the test runner execution model will be used.
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*/
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files?: readonly string[] | undefined;
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/**
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* Allows aborting an in-progress test execution.
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* @default undefined
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*/
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signal?: AbortSignal | undefined;
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/**
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* A number of milliseconds the test will fail after.
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* If unspecified, subtests inherit this value from their parent.
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* @default Infinity
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*/
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timeout?: number | undefined;
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/**
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* Sets inspector port of test child process.
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* If a nullish value is provided, each process gets its own port,
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* incremented from the primary's `process.debugPort`.
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*/
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inspectPort?: number | (() => number) | undefined;
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}
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/**
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* A successful call of the `run()` method will return a new `TapStream` object,
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* streaming a [TAP](https://testanything.org/) output.
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* `TapStream` will emit events in the order of the tests' definitions.
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* @since v18.9.0
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*/
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interface TapStream extends NodeJS.ReadableStream {
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addListener(event: 'test:diagnostic', listener: (message: string) => void): this;
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addListener(event: 'test:fail', listener: (data: TestFail) => void): this;
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addListener(event: 'test:pass', listener: (data: TestPass) => void): this;
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addListener(event: string, listener: (...args: any[]) => void): this;
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emit(event: 'test:diagnostic', message: string): boolean;
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emit(event: 'test:fail', data: TestFail): boolean;
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emit(event: 'test:pass', data: TestPass): boolean;
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emit(event: string | symbol, ...args: any[]): boolean;
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on(event: 'test:diagnostic', listener: (message: string) => void): this;
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on(event: 'test:fail', listener: (data: TestFail) => void): this;
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on(event: 'test:pass', listener: (data: TestPass) => void): this;
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on(event: string, listener: (...args: any[]) => void): this;
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once(event: 'test:diagnostic', listener: (message: string) => void): this;
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once(event: 'test:fail', listener: (data: TestFail) => void): this;
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once(event: 'test:pass', listener: (data: TestPass) => void): this;
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once(event: string, listener: (...args: any[]) => void): this;
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prependListener(event: 'test:diagnostic', listener: (message: string) => void): this;
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prependListener(event: 'test:fail', listener: (data: TestFail) => void): this;
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prependListener(event: 'test:pass', listener: (data: TestPass) => void): this;
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prependListener(event: string, listener: (...args: any[]) => void): this;
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prependOnceListener(event: 'test:diagnostic', listener: (message: string) => void): this;
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prependOnceListener(event: 'test:fail', listener: (data: TestFail) => void): this;
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prependOnceListener(event: 'test:pass', listener: (data: TestPass) => void): this;
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prependOnceListener(event: string, listener: (...args: any[]) => void): this;
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}
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interface TestFail {
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/**
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* The test duration.
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*/
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duration: number;
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/**
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* The failure casing test to fail.
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*/
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error: Error;
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/**
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* The test name.
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*/
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name: string;
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/**
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* The ordinal number of the test.
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*/
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testNumber: number;
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/**
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* Present if `context.todo` is called.
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*/
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todo?: string;
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/**
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* Present if `context.skip` is called.
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*/
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skip?: string;
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}
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interface TestPass {
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/**
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* The test duration.
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*/
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duration: number;
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/**
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* The test name.
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*/
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name: string;
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/**
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* The ordinal number of the test.
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*/
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testNumber: number;
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/**
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* Present if `context.todo` is called.
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*/
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todo?: string;
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/**
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* Present if `context.skip` is called.
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*/
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skip?: string;
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}
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/**
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* An instance of `TestContext` is passed to each test function in order to interact with the
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* test runner. However, the `TestContext` constructor is not exposed as part of the API.
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* @since v18.0.0
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*/
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interface TestContext {
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/**
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* This function is used to create a hook running before each subtest of the current test.
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* @param fn The hook function. If the hook uses callbacks, the callback function is passed as
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* the second argument. Default: A no-op function.
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* @param options Configuration options for the hook.
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* @since v18.8.0
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*/
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beforeEach: typeof beforeEach;
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/**
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* This function is used to create a hook that runs after the current test finishes.
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* @param fn The hook function. If the hook uses callbacks, the callback function is passed as
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* the second argument. Default: A no-op function.
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* @param options Configuration options for the hook.
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* @since v18.13.0
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*/
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after: typeof after;
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/**
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* This function is used to create a hook running after each subtest of the current test.
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* @param fn The hook function. If the hook uses callbacks, the callback function is passed as
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* the second argument. Default: A no-op function.
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* @param options Configuration options for the hook.
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* @since v18.8.0
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*/
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afterEach: typeof afterEach;
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/**
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* This function is used to write TAP diagnostics to the output. Any diagnostic information is
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* included at the end of the test's results. This function does not return a value.
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* @param message Message to be displayed as a TAP diagnostic.
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* @since v18.0.0
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*/
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diagnostic(message: string): void;
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/**
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* The name of the test.
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* @since v18.8.0
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*/
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readonly name: string;
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/**
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* If `shouldRunOnlyTests` is truthy, the test context will only run tests that have the `only`
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* option set. Otherwise, all tests are run. If Node.js was not started with the `--test-only`
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* command-line option, this function is a no-op.
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* @param shouldRunOnlyTests Whether or not to run `only` tests.
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* @since v18.0.0
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*/
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runOnly(shouldRunOnlyTests: boolean): void;
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/**
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* Can be used to abort test subtasks when the test has been aborted.
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* @since v18.7.0
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*/
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readonly signal: AbortSignal;
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/**
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* This function causes the test's output to indicate the test as skipped. If `message` is
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* provided, it is included in the TAP output. Calling `skip()` does not terminate execution of
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* the test function. This function does not return a value.
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* @param message Optional skip message to be displayed in TAP output.
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* @since v18.0.0
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*/
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skip(message?: string): void;
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/**
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* This function adds a `TODO` directive to the test's output. If `message` is provided, it is
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* included in the TAP output. Calling `todo()` does not terminate execution of the test
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* function. This function does not return a value.
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* @param message Optional `TODO` message to be displayed in TAP output.
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* @since v18.0.0
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*/
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todo(message?: string): void;
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/**
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* This function is used to create subtests under the current test. This function behaves in
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* the same fashion as the top level {@link test} function.
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* @since v18.0.0
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* @param name The name of the test, which is displayed when reporting test results.
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* Default: The `name` property of fn, or `'<anonymous>'` if `fn` does not have a name.
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* @param options Configuration options for the test
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* @param fn The function under test. This first argument to this function is a
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* {@link TestContext} object. If the test uses callbacks, the callback function is
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* passed as the second argument. Default: A no-op function.
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* @returns A {@link Promise} resolved with `undefined` once the test completes.
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*/
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test: typeof test;
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}
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interface TestOptions {
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/**
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* If a number is provided, then that many tests would run in parallel.
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* If truthy, it would run (number of cpu cores - 1) tests in parallel.
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* For subtests, it will be `Infinity` tests in parallel.
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* If falsy, it would only run one test at a time.
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* If unspecified, subtests inherit this value from their parent.
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* @default false
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*/
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concurrency?: number | boolean | undefined;
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/**
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* If truthy, and the test context is configured to run `only` tests, then this test will be
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* run. Otherwise, the test is skipped.
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* @default false
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*/
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only?: boolean | undefined;
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/**
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* Allows aborting an in-progress test.
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* @since v18.8.0
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*/
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signal?: AbortSignal | undefined;
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/**
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* If truthy, the test is skipped. If a string is provided, that string is displayed in the
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* test results as the reason for skipping the test.
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* @default false
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*/
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skip?: boolean | string | undefined;
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/**
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* A number of milliseconds the test will fail after. If unspecified, subtests inherit this
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* value from their parent.
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* @default Infinity
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* @since v18.7.0
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*/
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timeout?: number | undefined;
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/**
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* If truthy, the test marked as `TODO`. If a string is provided, that string is displayed in
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* the test results as the reason why the test is `TODO`.
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* @default false
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*/
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todo?: boolean | string | undefined;
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}
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/**
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* This function is used to create a hook running before running a suite.
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* @param fn The hook function. If the hook uses callbacks, the callback function is passed as
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* the second argument. Default: A no-op function.
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* @param options Configuration options for the hook.
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* @since v18.8.0
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*/
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function before(fn?: HookFn, options?: HookOptions): void;
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/**
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* This function is used to create a hook running after running a suite.
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* @param fn The hook function. If the hook uses callbacks, the callback function is passed as
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* the second argument. Default: A no-op function.
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* @param options Configuration options for the hook.
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* @since v18.8.0
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*/
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function after(fn?: HookFn, options?: HookOptions): void;
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/**
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* This function is used to create a hook running before each subtest of the current suite.
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* @param fn The hook function. If the hook uses callbacks, the callback function is passed as
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* the second argument. Default: A no-op function.
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* @param options Configuration options for the hook.
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* @since v18.8.0
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*/
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function beforeEach(fn?: HookFn, options?: HookOptions): void;
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/**
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* This function is used to create a hook running after each subtest of the current test.
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* @param fn The hook function. If the hook uses callbacks, the callback function is passed as
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* the second argument. Default: A no-op function.
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* @param options Configuration options for the hook.
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* @since v18.8.0
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*/
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function afterEach(fn?: HookFn, options?: HookOptions): void;
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/**
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* The hook function. If the hook uses callbacks, the callback function is passed as the
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* second argument.
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*/
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type HookFn = (done: (result?: any) => void) => any;
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/**
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* Configuration options for hooks.
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* @since v18.8.0
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*/
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interface HookOptions {
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/**
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* Allows aborting an in-progress hook.
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*/
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signal?: AbortSignal | undefined;
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/**
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* A number of milliseconds the hook will fail after. If unspecified, subtests inherit this
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* value from their parent.
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* @default Infinity
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*/
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timeout?: number | undefined;
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}
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export { test as default, run, test, describe, it, before, after, beforeEach, afterEach };
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}
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