assertNull()

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。

例 A.39: assertNull() 的使用

<?php
use PHPUnit\Framework\TestCase;
 
class NullTest extends TestCase
{
    public function testFailure()
    {
        $this->assertNull('foo');
    }
}
?>

phpunit NotNullTest
PHPUnit 6.5.0 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.