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+/**
+ * The `node:test` module provides a standalone testing module.
+ * @see [source](https://github.com/nodejs/node/blob/v18.x/lib/test.js)
+ */
+declare module 'node:test' {
+ /**
+ * Programmatically start the test runner.
+ * @since v18.9.0
+ * @param options Configuration options for running tests.
+ * @returns A {@link TestsStream} that emits events about the test execution.
+ */
+ function run(options?: RunOptions): TestsStream;
+
+ /**
+ * The `test()` function is the value imported from the test module. Each invocation of this
+ * function results in reporting the test to the {@link TestsStream}.
+ *
+ * The {@link TestContext} object passed to the fn argument can be used to perform actions
+ * related to the current test. Examples include skipping the test, adding additional
+ * diagnostic information, or creating subtests.
+ *
+ * `test()` returns a {@link Promise} that resolves once the test completes. The return value
+ * can usually be discarded for top level tests. However, the return value from subtests should
+ * be used to prevent the parent test from finishing first and cancelling the subtest as shown
+ * in the following example.
+ *
+ * ```js
+ * test('top level test', async (t) => {
+ * // The setTimeout() in the following subtest would cause it to outlive its
+ * // parent test if 'await' is removed on the next line. Once the parent test
+ * // completes, it will cancel any outstanding subtests.
+ * await t.test('longer running subtest', async (t) => {
+ * return new Promise((resolve, reject) => {
+ * setTimeout(resolve, 1000);
+ * });
+ * });
+ * });
+ * ```
+ * @since v18.0.0
+ * @param name The name of the test, which is displayed when reporting test results.
+ * Default: The `name` property of fn, or `'<anonymous>'` if `fn` does not have a name.
+ * @param options Configuration options for the test
+ * @param fn The function under test. The first argument to this function is a
+ * {@link TestContext} object. If the test uses callbacks, the callback function is
+ * passed as the second argument. Default: A no-op function.
+ * @returns A {@link Promise} resolved with `undefined` once the test completes.
+ */
+ function test(name?: string, fn?: TestFn): Promise<void>;
+ function test(name?: string, options?: TestOptions, fn?: TestFn): Promise<void>;
+ function test(options?: TestOptions, fn?: TestFn): Promise<void>;
+ function test(fn?: TestFn): Promise<void>;
+
+ /**
+ * @since v18.6.0
+ * @param name The name of the suite, which is displayed when reporting suite results.
+ * Default: The `name` property of fn, or `'<anonymous>'` if `fn` does not have a name.
+ * @param options Configuration options for the suite
+ * @param fn The function under suite. Default: A no-op function.
+ */
+ function describe(name?: string, options?: TestOptions, fn?: SuiteFn): void;
+ function describe(name?: string, fn?: SuiteFn): void;
+ function describe(options?: TestOptions, fn?: SuiteFn): void;
+ function describe(fn?: SuiteFn): void;
+ namespace describe {
+ // Shorthand for skipping a suite, same as `describe([name], { skip: true }[, fn])`.
+ function skip(name?: string, options?: TestOptions, fn?: SuiteFn): void;
+ function skip(name?: string, fn?: SuiteFn): void;
+ function skip(options?: TestOptions, fn?: SuiteFn): void;
+ function skip(fn?: SuiteFn): void;
+
+ // Shorthand for marking a suite as `TODO`, same as `describe([name], { todo: true }[, fn])`.
+ function todo(name?: string, options?: TestOptions, fn?: SuiteFn): void;
+ function todo(name?: string, fn?: SuiteFn): void;
+ function todo(options?: TestOptions, fn?: SuiteFn): void;
+ function todo(fn?: SuiteFn): void;
+ }
+
+ /**
+ * @since v18.6.0
+ * @param name The name of the test, which is displayed when reporting test results.
+ * Default: The `name` property of fn, or `'<anonymous>'` if `fn` does not have a name.
+ * @param options Configuration options for the test
+ * @param fn The function under test. If the test uses callbacks, the callback function is
+ * passed as the second argument. Default: A no-op function.
+ */
+ function it(name?: string, options?: TestOptions, fn?: ItFn): void;
+ function it(name?: string, fn?: ItFn): void;
+ function it(options?: TestOptions, fn?: ItFn): void;
+ function it(fn?: ItFn): void;
+ namespace it {
+ // Shorthand for skipping a test, same as `it([name], { skip: true }[, fn])`.
+ function skip(name?: string, options?: TestOptions, fn?: ItFn): void;
+ function skip(name?: string, fn?: ItFn): void;
+ function skip(options?: TestOptions, fn?: ItFn): void;
+ function skip(fn?: ItFn): void;
+
+ // Shorthand for marking a test as `TODO`, same as `it([name], { todo: true }[, fn])`.
+ function todo(name?: string, options?: TestOptions, fn?: ItFn): void;
+ function todo(name?: string, fn?: ItFn): void;
+ function todo(options?: TestOptions, fn?: ItFn): void;
+ function todo(fn?: ItFn): void;
+ }
+
+ /**
+ * The type of a function under test. The first argument to this function is a
+ * {@link TestContext} object. If the test uses callbacks, the callback function is passed as
+ * the second argument.
+ */
+ type TestFn = (t: TestContext, done: (result?: any) => void) => any;
+
+ /**
+ * The type of a function under Suite.
+ * If the test uses callbacks, the callback function is passed as an argument
+ */
+ type SuiteFn = (done: (result?: any) => void) => void;
+
+ /**
+ * The type of a function under test.
+ * If the test uses callbacks, the callback function is passed as an argument
+ */
+ type ItFn = (done: (result?: any) => void) => any;
+
+ interface RunOptions {
+ /**
+ * If a number is provided, then that many files would run in parallel.
+ * If truthy, it would run (number of cpu cores - 1) files in parallel.
+ * If falsy, it would only run one file at a time.
+ * If unspecified, subtests inherit this value from their parent.
+ * @default true
+ */
+ concurrency?: number | boolean | undefined;
+
+ /**
+ * An array containing the list of files to run.
+ * If unspecified, the test runner execution model will be used.
+ */
+ files?: readonly string[] | undefined;
+
+ /**
+ * Allows aborting an in-progress test execution.
+ * @default undefined
+ */
+ signal?: AbortSignal | undefined;
+
+ /**
+ * A number of milliseconds the test will fail after.
+ * If unspecified, subtests inherit this value from their parent.
+ * @default Infinity
+ */
+ timeout?: number | undefined;
+
+ /**
+ * Sets inspector port of test child process.
+ * If a nullish value is provided, each process gets its own port,
+ * incremented from the primary's `process.debugPort`.
+ */
+ inspectPort?: number | (() => number) | undefined;
+ }
+
+ /**
+ * A successful call of the `run()` method will return a new `TestsStream` object,
+ * streaming a series of events representing the execution of the tests.
+ * `TestsStream` will emit events in the order of the tests' definitions.
+ * @since v18.9.0
+ */
+ interface TestsStream extends NodeJS.ReadableStream {
+ addListener(event: 'test:diagnostic', listener: (data: DiagnosticData) => void): this;
+ addListener(event: 'test:fail', listener: (data: TestFail) => void): this;
+ addListener(event: 'test:pass', listener: (data: TestPass) => void): this;
+ addListener(event: 'test:plan', listener: (data: TestPlan) => void): this;
+ addListener(event: 'test:start', listener: (data: TestStart) => void): this;
+ addListener(event: string, listener: (...args: any[]) => void): this;
+ emit(event: 'test:diagnostic', data: DiagnosticData): boolean;
+ emit(event: 'test:fail', data: TestFail): boolean;
+ emit(event: 'test:pass', data: TestPass): boolean;
+ emit(event: 'test:plan', data: TestPlan): boolean;
+ emit(event: 'test:start', data: TestStart): boolean;
+ emit(event: string | symbol, ...args: any[]): boolean;
+ on(event: 'test:diagnostic', listener: (data: DiagnosticData) => void): this;
+ on(event: 'test:fail', listener: (data: TestFail) => void): this;
+ on(event: 'test:pass', listener: (data: TestPass) => void): this;
+ on(event: 'test:plan', listener: (data: TestPlan) => void): this;
+ on(event: 'test:start', listener: (data: TestStart) => void): this;
+ on(event: string, listener: (...args: any[]) => void): this;
+ once(event: 'test:diagnostic', listener: (data: DiagnosticData) => void): this;
+ once(event: 'test:fail', listener: (data: TestFail) => void): this;
+ once(event: 'test:pass', listener: (data: TestPass) => void): this;
+ once(event: 'test:plan', listener: (data: TestPlan) => void): this;
+ once(event: 'test:start', listener: (data: TestStart) => void): this;
+ once(event: string, listener: (...args: any[]) => void): this;
+ prependListener(event: 'test:diagnostic', listener: (data: DiagnosticData) => void): this;
+ prependListener(event: 'test:fail', listener: (data: TestFail) => void): this;
+ prependListener(event: 'test:pass', listener: (data: TestPass) => void): this;
+ prependListener(event: 'test:plan', listener: (data: TestPlan) => void): this;
+ prependListener(event: 'test:start', listener: (data: TestStart) => void): this;
+ prependListener(event: string, listener: (...args: any[]) => void): this;
+ prependOnceListener(event: 'test:diagnostic', listener: (data: DiagnosticData) => void): this;
+ prependOnceListener(event: 'test:fail', listener: (data: TestFail) => void): this;
+ prependOnceListener(event: 'test:pass', listener: (data: TestPass) => void): this;
+ prependOnceListener(event: 'test:plan', listener: (data: TestPlan) => void): this;
+ prependOnceListener(event: 'test:start', listener: (data: TestStart) => void): this;
+ prependOnceListener(event: string, listener: (...args: any[]) => void): this;
+ }
+
+ interface DiagnosticData {
+ /**
+ * The diagnostic message.
+ */
+ message: string;
+
+ /**
+ * The nesting level of the test.
+ */
+ nesting: number;
+ }
+
+ interface TestFail {
+ /**
+ * Additional execution metadata.
+ */
+ details: {
+ /**
+ * The duration of the test in milliseconds.
+ */
+ duration: number;
+
+ /**
+ * The error thrown by the test.
+ */
+ error: Error;
+ };
+
+ /**
+ * The test name.
+ */
+ name: string;
+
+ /**
+ * The nesting level of the test.
+ */
+ nesting: number;
+
+ /**
+ * The ordinal number of the test.
+ */
+ testNumber: number;
+
+ /**
+ * Present if `context.todo` is called.
+ */
+ todo?: string | boolean;
+
+ /**
+ * Present if `context.skip` is called.
+ */
+ skip?: string | boolean;
+ }
+
+ interface TestPass {
+ /**
+ * Additional execution metadata.
+ */
+ details: {
+ /**
+ * The duration of the test in milliseconds.
+ */
+ duration: number;
+ };
+
+ /**
+ * The test name.
+ */
+ name: string;
+
+ /**
+ * The nesting level of the test.
+ */
+ nesting: number;
+
+ /**
+ * The ordinal number of the test.
+ */
+ testNumber: number;
+
+ /**
+ * Present if `context.todo` is called.
+ */
+ todo?: string | boolean;
+
+ /**
+ * Present if `context.skip` is called.
+ */
+ skip?: string | boolean;
+ }
+
+ interface TestPlan {
+ /**
+ * The nesting level of the test.
+ */
+ nesting: number;
+
+ /**
+ * The number of subtests that have ran.
+ */
+ count: number;
+ }
+
+ interface TestStart {
+ /**
+ * The test name.
+ */
+ name: string;
+
+ /**
+ * The nesting level of the test.
+ */
+ nesting: number;
+ }
+
+ /**
+ * An instance of `TestContext` is passed to each test function in order to interact with the
+ * test runner. However, the `TestContext` constructor is not exposed as part of the API.
+ * @since v18.0.0
+ */
+ interface TestContext {
+ /**
+ * This function is used to create a hook running before each subtest of the current test.
+ * @param fn The hook function. If the hook uses callbacks, the callback function is passed as
+ * the second argument. Default: A no-op function.
+ * @param options Configuration options for the hook.
+ * @since v18.8.0
+ */
+ beforeEach: typeof beforeEach;
+
+ /**
+ * This function is used to create a hook that runs after the current test finishes.
+ * @param fn The hook function. If the hook uses callbacks, the callback function is passed as
+ * the second argument. Default: A no-op function.
+ * @param options Configuration options for the hook.
+ * @since v18.13.0
+ */
+ after: typeof after;
+
+ /**
+ * This function is used to create a hook running after each subtest of the current test.
+ * @param fn The hook function. If the hook uses callbacks, the callback function is passed as
+ * the second argument. Default: A no-op function.
+ * @param options Configuration options for the hook.
+ * @since v18.8.0
+ */
+ afterEach: typeof afterEach;
+
+ /**
+ * This function is used to write diagnostics to the output. Any diagnostic information is
+ * included at the end of the test's results. This function does not return a value.
+ * @param message Message to be reported.
+ * @since v18.0.0
+ */
+ diagnostic(message: string): void;
+
+ /**
+ * The name of the test.
+ * @since v18.8.0
+ */
+ readonly name: string;
+
+ /**
+ * If `shouldRunOnlyTests` is truthy, the test context will only run tests that have the `only`
+ * option set. Otherwise, all tests are run. If Node.js was not started with the `--test-only`
+ * command-line option, this function is a no-op.
+ * @param shouldRunOnlyTests Whether or not to run `only` tests.
+ * @since v18.0.0
+ */
+ runOnly(shouldRunOnlyTests: boolean): void;
+
+ /**
+ * Can be used to abort test subtasks when the test has been aborted.
+ * @since v18.7.0
+ */
+ readonly signal: AbortSignal;
+
+ /**
+ * This function causes the test's output to indicate the test as skipped. If `message` is
+ * provided, it is included in the output. Calling `skip()` does not terminate execution of
+ * the test function. This function does not return a value.
+ * @param message Optional skip message.
+ * @since v18.0.0
+ */
+ skip(message?: string): void;
+
+ /**
+ * This function adds a `TODO` directive to the test's output. If `message` is provided, it is
+ * included in the output. Calling `todo()` does not terminate execution of the test
+ * function. This function does not return a value.
+ * @param message Optional `TODO` message.
+ * @since v18.0.0
+ */
+ todo(message?: string): void;
+
+ /**
+ * This function is used to create subtests under the current test. This function behaves in
+ * the same fashion as the top level {@link test} function.
+ * @since v18.0.0
+ * @param name The name of the test, which is displayed when reporting test results.
+ * Default: The `name` property of fn, or `'<anonymous>'` if `fn` does not have a name.
+ * @param options Configuration options for the test
+ * @param fn The function under test. This first argument to this function is a
+ * {@link TestContext} object. If the test uses callbacks, the callback function is
+ * passed as the second argument. Default: A no-op function.
+ * @returns A {@link Promise} resolved with `undefined` once the test completes.
+ */
+ test: typeof test;
+ /**
+ * Each test provides its own MockTracker instance.
+ */
+ readonly mock: MockTracker;
+ }
+
+ interface TestOptions {
+ /**
+ * If a number is provided, then that many tests would run in parallel.
+ * If truthy, it would run (number of cpu cores - 1) tests in parallel.
+ * For subtests, it will be `Infinity` tests in parallel.
+ * If falsy, it would only run one test at a time.
+ * If unspecified, subtests inherit this value from their parent.
+ * @default false
+ */
+ concurrency?: number | boolean | undefined;
+
+ /**
+ * If truthy, and the test context is configured to run `only` tests, then this test will be
+ * run. Otherwise, the test is skipped.
+ * @default false
+ */
+ only?: boolean | undefined;
+
+ /**
+ * Allows aborting an in-progress test.
+ * @since v18.8.0
+ */
+ signal?: AbortSignal | undefined;
+
+ /**
+ * If truthy, the test is skipped. If a string is provided, that string is displayed in the
+ * test results as the reason for skipping the test.
+ * @default false
+ */
+ skip?: boolean | string | undefined;
+
+ /**
+ * A number of milliseconds the test will fail after. If unspecified, subtests inherit this
+ * value from their parent.
+ * @default Infinity
+ * @since v18.7.0
+ */
+ timeout?: number | undefined;
+
+ /**
+ * If truthy, the test marked as `TODO`. If a string is provided, that string is displayed in
+ * the test results as the reason why the test is `TODO`.
+ * @default false
+ */
+ todo?: boolean | string | undefined;
+ }
+
+ /**
+ * This function is used to create a hook running before running a suite.
+ * @param fn The hook function. If the hook uses callbacks, the callback function is passed as
+ * the second argument. Default: A no-op function.
+ * @param options Configuration options for the hook.
+ * @since v18.8.0
+ */
+ function before(fn?: HookFn, options?: HookOptions): void;
+
+ /**
+ * This function is used to create a hook running after running a suite.
+ * @param fn The hook function. If the hook uses callbacks, the callback function is passed as
+ * the second argument. Default: A no-op function.
+ * @param options Configuration options for the hook.
+ * @since v18.8.0
+ */
+ function after(fn?: HookFn, options?: HookOptions): void;
+
+ /**
+ * This function is used to create a hook running before each subtest of the current suite.
+ * @param fn The hook function. If the hook uses callbacks, the callback function is passed as
+ * the second argument. Default: A no-op function.
+ * @param options Configuration options for the hook.
+ * @since v18.8.0
+ */
+ function beforeEach(fn?: HookFn, options?: HookOptions): void;
+
+ /**
+ * This function is used to create a hook running after each subtest of the current test.
+ * @param fn The hook function. If the hook uses callbacks, the callback function is passed as
+ * the second argument. Default: A no-op function.
+ * @param options Configuration options for the hook.
+ * @since v18.8.0
+ */
+ function afterEach(fn?: HookFn, options?: HookOptions): void;
+
+ /**
+ * The hook function. If the hook uses callbacks, the callback function is passed as the
+ * second argument.
+ */
+ type HookFn = (done: (result?: any) => void) => any;
+
+ /**
+ * Configuration options for hooks.
+ * @since v18.8.0
+ */
+ interface HookOptions {
+ /**
+ * Allows aborting an in-progress hook.
+ */
+ signal?: AbortSignal | undefined;
+
+ /**
+ * A number of milliseconds the hook will fail after. If unspecified, subtests inherit this
+ * value from their parent.
+ * @default Infinity
+ */
+ timeout?: number | undefined;
+ }
+
+ interface MockFunctionOptions {
+ /**
+ * The number of times that the mock will use the behavior of `implementation`.
+ * Once the mock function has been called `times` times,
+ * it will automatically restore the behavior of `original`.
+ * This value must be an integer greater than zero.
+ * @default Infinity
+ */
+ times?: number | undefined;
+ }
+
+ interface MockMethodOptions extends MockFunctionOptions {
+ /**
+ * If `true`, `object[methodName]` is treated as a getter.
+ * This option cannot be used with the `setter` option.
+ */
+ getter?: boolean | undefined;
+
+ /**
+ * If `true`, `object[methodName]` is treated as a setter.
+ * This option cannot be used with the `getter` option.
+ */
+ setter?: boolean | undefined;
+ }
+
+ type Mock<F extends Function> = F & {
+ mock: MockFunctionContext<F>;
+ };
+
+ type NoOpFunction = (...args: any[]) => undefined;
+
+ type FunctionPropertyNames<T> = {
+ [K in keyof T]: T[K] extends Function ? K : never;
+ }[keyof T];
+
+ interface MockTracker {
+ /**
+ * This function is used to create a mock function.
+ * @param original An optional function to create a mock on.
+ * @param implementation An optional function used as the mock implementation for `original`.
+ * This is useful for creating mocks that exhibit one behavior for a specified number of calls and then restore the behavior of `original`.
+ * @param options Optional configuration options for the mock function.
+ */
+ fn<F extends Function = NoOpFunction>(original?: F, options?: MockFunctionOptions): Mock<F>;
+ fn<F extends Function = NoOpFunction, Implementation extends Function = F>(original?: F, implementation?: Implementation, options?: MockFunctionOptions): Mock<F | Implementation>;
+
+ /**
+ * This function is used to create a mock on an existing object method.
+ * @param object The object whose method is being mocked.
+ * @param methodName The identifier of the method on `object` to mock. If `object[methodName]` is not a function, an error is thrown.
+ * @param implementation An optional function used as the mock implementation for `object[methodName]`.
+ * @param options Optional configuration options for the mock method.
+ */
+ method<
+ MockedObject extends object,
+ MethodName extends FunctionPropertyNames<MockedObject>,
+ >(
+ object: MockedObject,
+ methodName: MethodName,
+ options?: MockFunctionOptions,
+ ): MockedObject[MethodName] extends Function
+ ? Mock<MockedObject[MethodName]>
+ : never;
+ method<
+ MockedObject extends object,
+ MethodName extends FunctionPropertyNames<MockedObject>,
+ Implementation extends Function,
+ >(
+ object: MockedObject,
+ methodName: MethodName,
+ implementation: Implementation,
+ options?: MockFunctionOptions,
+ ): MockedObject[MethodName] extends Function
+ ? Mock<MockedObject[MethodName] | Implementation>
+ : never;
+ method<MockedObject extends object>(
+ object: MockedObject,
+ methodName: keyof MockedObject,
+ options: MockMethodOptions,
+ ): Mock<Function>;
+ method<MockedObject extends object>(
+ object: MockedObject,
+ methodName: keyof MockedObject,
+ implementation: Function,
+ options: MockMethodOptions,
+ ): Mock<Function>;
+
+ /**
+ * This function is syntax sugar for {@link MockTracker.method} with `options.getter` set to `true`.
+ */
+ getter<
+ MockedObject extends object,
+ MethodName extends keyof MockedObject,
+ >(
+ object: MockedObject,
+ methodName: MethodName,
+ options?: MockFunctionOptions,
+ ): Mock<() => MockedObject[MethodName]>;
+ getter<
+ MockedObject extends object,
+ MethodName extends keyof MockedObject,
+ Implementation extends Function,
+ >(
+ object: MockedObject,
+ methodName: MethodName,
+ implementation?: Implementation,
+ options?: MockFunctionOptions,
+ ): Mock<(() => MockedObject[MethodName]) | Implementation>;
+
+ /**
+ * This function is syntax sugar for {@link MockTracker.method} with `options.setter` set to `true`.
+ */
+ setter<
+ MockedObject extends object,
+ MethodName extends keyof MockedObject,
+ >(
+ object: MockedObject,
+ methodName: MethodName,
+ options?: MockFunctionOptions,
+ ): Mock<(value: MockedObject[MethodName]) => void>;
+ setter<
+ MockedObject extends object,
+ MethodName extends keyof MockedObject,
+ Implementation extends Function,
+ >(
+ object: MockedObject,
+ methodName: MethodName,
+ implementation?: Implementation,
+ options?: MockFunctionOptions,
+ ): Mock<((value: MockedObject[MethodName]) => void) | Implementation>;
+
+ /**
+ * This function restores the default behavior of all mocks that were previously created by this `MockTracker`
+ * and disassociates the mocks from the `MockTracker` instance. Once disassociated, the mocks can still be used,
+ * but the `MockTracker` instance can no longer be used to reset their behavior or otherwise interact with them.
+ *
+ * After each test completes, this function is called on the test context's `MockTracker`.
+ * If the global `MockTracker` is used extensively, calling this function manually is recommended.
+ */
+ reset(): void;
+
+ /**
+ * This function restores the default behavior of all mocks that were previously created by this `MockTracker`.
+ * Unlike `mock.reset()`, `mock.restoreAll()` does not disassociate the mocks from the `MockTracker` instance.
+ */
+ restoreAll(): void;
+ }
+
+ const mock: MockTracker;
+
+ interface MockFunctionCall<
+ F extends Function,
+ ReturnType = F extends (...args: any) => infer T
+ ? T
+ : F extends abstract new (...args: any) => infer T
+ ? T
+ : unknown,
+ Args = F extends (...args: infer Y) => any
+ ? Y
+ : F extends abstract new (...args: infer Y) => any
+ ? Y
+ : unknown[],
+ > {
+ /**
+ * An array of the arguments passed to the mock function.
+ */
+ arguments: Args;
+ /**
+ * If the mocked function threw then this property contains the thrown value.
+ */
+ error: unknown | undefined;
+ /**
+ * The value returned by the mocked function.
+ *
+ * If the mocked function threw, it will be `undefined`.
+ */
+ result: ReturnType | undefined;
+ /**
+ * An `Error` object whose stack can be used to determine the callsite of the mocked function invocation.
+ */
+ stack: Error;
+ /**
+ * If the mocked function is a constructor, this field contains the class being constructed.
+ * Otherwise this will be `undefined`.
+ */
+ target: F extends abstract new (...args: any) => any ? F : undefined;
+ /**
+ * The mocked function's `this` value.
+ */
+ this: unknown;
+ }
+
+ interface MockFunctionContext<F extends Function> {
+ /**
+ * A getter that returns a copy of the internal array used to track calls to the mock.
+ */
+ readonly calls: Array<MockFunctionCall<F>>;
+
+ /**
+ * This function returns the number of times that this mock has been invoked.
+ * This function is more efficient than checking `ctx.calls.length`
+ * because `ctx.calls` is a getter that creates a copy of the internal call tracking array.
+ */
+ callCount(): number;
+
+ /**
+ * This function is used to change the behavior of an existing mock.
+ * @param implementation The function to be used as the mock's new implementation.
+ */
+ mockImplementation(implementation: Function): void;
+
+ /**
+ * This function is used to change the behavior of an existing mock for a single invocation.
+ * Once invocation `onCall` has occurred, the mock will revert to whatever behavior
+ * it would have used had `mockImplementationOnce()` not been called.
+ * @param implementation The function to be used as the mock's implementation for the invocation number specified by `onCall`.
+ * @param onCall The invocation number that will use `implementation`.
+ * If the specified invocation has already occurred then an exception is thrown.
+ */
+ mockImplementationOnce(implementation: Function, onCall?: number): void;
+
+ /**
+ * Resets the call history of the mock function.
+ */
+ resetCalls(): void;
+
+ /**
+ * Resets the implementation of the mock function to its original behavior.
+ * The mock can still be used after calling this function.
+ */
+ restore(): void;
+ }
+
+ export { test as default, run, test, describe, it, before, after, beforeEach, afterEach, mock };
+}