toBeString() ->and(1.1)->not->toBeString(); }); test('failures', function (): void { expect()->toBeString(); })->throws(ExpectationFailedException::class); test('failures with custom message', function (): void { expect()->toBeString('oh no!'); })->throws(ExpectationFailedException::class, 'oh no!'); test('not failures', function (): void { expect('42')->not->toBeString(); })->throws(ExpectationFailedException::class);