assertNull()
最后更新于：2022-04-01 03:47:57
# assertNull()
>[info] ## assertNull(mixed $variable[, string $message = ''])
当 `$actual` 不是 `NULL` 时报告错误，错误讯息由 `$message` 指定。
`assertNotNull()` 是与之相反的断言，接受相同的参数。
**Example A.32. assertNull() 的使用**
~~~
<?php
class NullTest extends PHPUnit_Framework_TestCase
{
public function testFailure()
{
$this->assertNull('foo');
}
}
?>
~~~
~~~
phpunit NotNullTest
PHPUnit 5.0.0 by Sebastian Bergmann and contributors.
F
Time: 0 seconds, Memory: 5.00Mb
There was 1 failure:
1) NullTest::testFailure
Failed asserting that 'foo' is null.
/home/sb/NotNullTest.php:6
FAILURES!
Tests: 1, Assertions: 1, Failures: 1.
~~~