Make an assertion, if not true, then throw.

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

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

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

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

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

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.

Use this to assert unreachable code.