Converts the input into a string. Objects, Sets and Maps are sorted so as to make tests less flaky

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

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

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

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

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

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

Executes a function, expecting it to throw. If it does not, then it throws. An error class and a string that should be included in the error message can also be asserted.

Executes a function which returns a promise, expecting it to throw or reject. If it does not, then it throws. An error class and a string that should be included in the error message can also be asserted.

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.