Given a method f which has the production code as follows:
def eat_cake(cake) unwrap(cake) eat(cake) end
When TDDing you need at least 2 tests to be confident that your method hasn’t been slimed. With only 1 test you can pass the test by hard coding the tested value. E.g.
def test_eating_cake_eats_carrot_cake eat_cake(:carrot_cake) expect(eat).called_with :carrot_cake end def eat_cake(cake) eat(:carrot_cake) end