'foo'])->toHaveKey('key')->key->toBeString(); }); it('is a higher order message test')->expect(true)->toBeTrue(); describe('a "describe" group of tests', function () { it('is a test', function () { expect(['key' => 'foo'])->toHaveKey('key')->key->toBeString(); }); it('is a higher order message test')->expect(true)->toBeTrue(); });