A library of assertion functions. If the assertion is false an AssertionError will be thrown which will result in pretty-printed diff of failing assertion.

A BDD interface to Deno.test() API.

A mocking and spying library.

A snapshotting library.

Utilities for mocking time while testing.

An error related to spying on a function or instance method.

Overrides the real Date object and timer functions with fake ones that can be controlled through the fake time instance.

An error related to faking time.

Make an assertion, error will be thrown if expr does not have truthy value.

Make an assertion that actual and expected are almost equal numbers through a given tolerance. It can be used to take into account IEEE-754 double-precision floating-point representation limitations. If the values are not almost equal then throw.

Make an assertion that actual includes the expected values. If not then an error will be thrown.

Make an assertion that actual and expected are equal, deeply. If not deeply equal, then throw.

Make an assertion that actual is not null or undefined. If not then throw.

Make an assertion that obj is an instance of type. If not then throw.

Make an assertion that error is an Error. If not then an error will be thrown. An error class and a string that should be included in the error message can also be asserted.

Make an assertion that actual match RegExp expected. If not then throw.

Make an assertion that actual and expected are not equal, deeply. If not then throw.

Make an assertion that obj is not an instance of type. If so, then throw.

Make an assertion that actual not match RegExp expected. If match then throw.

Make an assertion that actual and expected are not strictly equal. If the values are strictly equal then throw.

Make an assertion that actual object is a subset of expected object, deeply. If not, then throw.

Executes a function which returns a promise, expecting it to reject.

Make an assertion that actual and expected are strictly equal. If not then throw.

Make an assertion that actual includes expected. If not then throw.

Executes a function, expecting it to throw. If it does not, then it throws.

Deep equality comparison used in assertions

Forcefully throws a failed assertion

Use this to stub out methods that will throw when invoked.

Use this to assert unreachable code.

Run some shared teardown after all of the tests in the suite.

Run some shared teardown after each test in the suite.

Run some shared setup before all of the tests in the suite.

Run some shared setup before each test in the suite.

Registers a test suite.

Registers an individual test case.

Asserts that a spy is called as expected.

Asserts that a spy is called with a specific arg as expected.

Asserts that an async spy is called as expected.

Asserts that a spy is called as much as expected and no more.

Creates a session that tracks all mocks created before it's restored. If a callback is provided, it restores all mocks created within it.

Creates an async session that tracks all mocks created before the promise resolves.

Creates a function that resolves the awaited iterable values. Any awaited iterable values that are errors will be thrown.

Restores all mocks registered in the current session that have not already been restored. If an id is provided, it will restore all mocks registered in the session associed with that id that have not already been restored.

Creates a function that returns one of its arguments.

Creates a function that returns its arguments or a subset of them. If end is specified, it will return arguments up to but not including the end.

Creates a function that returns the iterable values. Any iterable values that are errors will be thrown.

Creates a function that returns the instance the method was called on.

Wraps a function or instance method with a Spy.

Replaces an instance method with a Stub.

Make an assertion that actual matches a snapshot. If the snapshot and actual do not a match, then throw.

Default serializer for assertSnapshot.

Registers a test suite.

The options for creating a test suite with the describe function.

Registers an individual test case.

The options for creating an individual test case with the it function.

A group of tests.

Call information recorded by a spy.

A function or instance method wrapper that records all calls made to it.

Call information recorded by a spy.

An instance method replacement that records all calls made to it.

The arguments for a DescribeFunction.

The arguments for an ItFunction.