# assertEmpty() >[info] ## assertEmpty(mixed $actual[, string $message = '']) 当 `$actual` 非空时报告错误，错误讯息由 `$message` 指定。 `assertNotEmpty()` 是与之相反的断言，接受相同的参数。 `assertAttributeEmpty()` 和 `assertAttributeNotEmpty()` 是便捷包装(convenience wrapper)，可以应用于某个类或对象的某个 `public`、`protected` 或 `private` 属性。 **Example A.11. assertEmpty() 的用法** ~~~ <?php class EmptyTest extends PHPUnit_Framework_TestCase { public function testFailure() { $this->assertEmpty(array('foo')); } } ?> ~~~ ~~~ phpunit EmptyTest PHPUnit 5.0.0 by Sebastian Bergmann and contributors. F Time: 0 seconds, Memory: 4.75Mb There was 1 failure: 1) EmptyTest::testFailure Failed asserting that an array is empty. /home/sb/EmptyTest.php:6 FAILURES! Tests: 1, Assertions: 1, Failures: 1. ~~~