[l0b0]

Two more:

- Fuzz testing: randomising inputs to validate the mapping to expected outputs.

- Mutation testing: changing code (`+` to `-`, `raise Foo` to `return`, etc.) to complement and validate the coverage metric.

[BerislavLopac]

To be fair, mutation testing checks the tests themselves, not the actual code. But yes, it is still a valuable tool in the QA arsenal.