toBeKebabCase() ->and('abc-def')->toBeKebabCase() ->and('abc_def')->not->toBeKebabCase() ->and('abcDef')->not->toBeKebabCase() ->and('AbcDef')->not->toBeKebabCase(); }); test('failures', function (): void { expect('Abc')->toBeKebabCase(); })->throws(ExpectationFailedException::class); test('failures with custom message', function (): void { expect('Abc')->toBeKebabCase('oh no!'); })->throws(ExpectationFailedException::class, 'oh no!'); test('not failures', function (): void { expect('abc-def')->not->toBeKebabCase(); })->throws(ExpectationFailedException::class);