# assertLessThan() >[info] ## assertLessThan(mixed $expected, mixed $actual[, string $message = '']) 当 `$actual` 的值不小于 `$expected` 的值时报告错误，错误讯息由 `$message` 指定。 `assertAttributeLessThan()` 是便捷包装(convenience wrapper)，以某个类或对象的某个 `public`、`protected` 或 `private` 属性作为实际值来进行比较。 **Example A.29. assertLessThan() 的用法** ~~~ <?php class LessThanTest extends PHPUnit_Framework_TestCase { public function testFailure() { $this->assertLessThan(1, 2); } } ?> ~~~ ~~~ phpunit LessThanTest PHPUnit 5.0.0 by Sebastian Bergmann and contributors. F Time: 0 seconds, Memory: 5.00Mb There was 1 failure: 1) LessThanTest::testFailure Failed asserting that 2 is less than 1. /home/sb/LessThanTest.php:6 FAILURES! Tests: 1, Assertions: 1, Failures: 1. ~~~