toBeArray(); expect('1, 2, 3')->not->toBeArray(); }); test('failures', function () { expect(null)->toBeArray(); })->throws(ExpectationFailedException::class); test('failures with custom message', function () { expect(null)->toBeArray('oh no!'); })->throws(ExpectationFailedException::class, 'oh no!'); test('not failures', function () { expect(['a', 'b', 'c'])->not->toBeArray(); })->throws(ExpectationFailedException::class);