Confirm that return value of previous test step is deeply, strictly equal to expected value.

Confirm that object has key. Optionally, confirm predicates about the value of that key.

Confirm that string or array includes an expected value.

Confirm that value returned by previous test step is of given type. Optionally, confirms other predicates about the value.

Test entrypoint. When test module is run (not imported), tests in the suite run, and a report is printed.

Test case. Consists of name and zero or more test steps.

Define result categories.

Define result category.

Test stack frame.

Parse test filters.

Result of test step.

Define test stack.

Test category name.

Ensure test step is function.

Test stack and context. Passed to eacgh step as second argument.