function it_should_change_the_case_of_the_keys_for_an_array() { $this::array_change_key_case(['Ädam' => 'Foo', 'Böb' => 'foo', 'foO' => 'foo'])->shouldBeEqualTo(['ädam' => 'Foo', 'böb' => 'foo', 'foo' => 'foo']); }