使用PHPUnit区分NULL和FALSE

时间:2011-05-12 02:40:39

标签: php unit-testing null phpunit

有没有人知道用PHPUnit区分FALSE和NULL的可靠方法?

我试图在断言中的返回值中区分NULL和FALSE。

这失败了:

$this->assertNotEquals(FALSE, NULL);

这些断言通过:

$this->assertFalse(NULL);
$this->assertNull(FALSE);

编辑:对于某些上下文,这是为了区分错误状态(FALSE)和空结果(NULL)。为了确保功能正常返回,我需要区分这两者。 感谢

编辑... 根据我正在测试的一些问题,我正在添加测试。

Class testNullFalse extends PHPUnit_Framework_TestCase{


    public function test_null_not_false (){
      $this->assertNotEquals(FALSE, NULL, "False and null are not the same");
    }

    public function test_null_is_false (){
      $this->assertFalse(NULL, "Null is clearly not FALSE");
    }

    public function test_false_is_null (){
      $this->assertNull(FALSE, "False is clearly not NULL");
    }

    public function test_false_equals_null(){
      $this->assertEquals(FALSE, NULL, "False and null are not equal");
    }

    public function test_false_sameas_null(){
      $this->assertSame(FALSE, NULL, "False and null are not the same");
    }

    public function test_false_not_sameas_null(){
      $this->assertNotSame(FALSE, NULL, "False and null are not the same");
    }
}

结果。

PHPUnit 3.5.10 by Sebastian Bergmann.

FFF.F.

Time: 0 seconds, Memory: 5.50Mb

There were 4 failures:

1) testNullFalse::test_null_not_false
False and null are not the same
Failed asserting that <null> is not equal to <boolean:false>.

2) testNullFalse::test_null_is_false
Null is clearly not FALSE
Failed asserting that <null> is false.

3) testNullFalse::test_false_is_null
False is clearly not NULL
Failed asserting that <boolean:false> is null.

4) testNullFalse::test_false_sameas_null
False and null are not the same
<null> does not match expected type "boolean".

FAILURES!
Tests: 6, Assertions: 6, Failures: 4.

3 个答案:

答案 0 :(得分:19)

这些断言使用==来执行类型强制。 Hamcrest的identicalTo($value)使用===,我相信PHPUnit的assertSame($expected, $actual)也是如此。

self::assertSame(false, $dao->getUser(-2));

更新:在回答您的评论时,“它可以是NULL或对象”:

$user = $dao->getUser(-2);
self::assertTrue($user === null || is_object($user));

使用Hamcrest断言更具表现力,特别是在发生故障时:

assertThat($dao->getUser(-2), anyOf(objectValue(), nullValue()));

答案 1 :(得分:6)

自己执行比较,并使用严格类型运算符。

$this->assertTrue(false !== null);

http://php.net/operators.comparison

答案 2 :(得分:1)

@David与assertSame(+1)是对的,它会为你做===严格比较。


但是让我问你:

您使用的是哪个版本的phpunit?

这个断言:

$this->assertFalse(null);

应该产生和错误!

示例代码:

<?php

class mepTest extends PHPUnit_Framework_TestCase {

    public function testFalseNull() {
        $this->assertFalse(null);
    }

    public function testNullFalse() {
        $this->assertNull(false);
   }
}

结果:

phpunit mepTest.php

PHPUnit 3.5.12 by Sebastian Bergmann.

FF

Time: 0 seconds, Memory: 3.00Mb

There were 2 failures:

1) mepTest::testFalseNull
Failed asserting that <null> is false.

/home/.../mepTest.php:6

2) mepTest::testNullFalse
Failed asserting that <boolean:false> is null.

/home/.../mepTest.php:10

FAILURES!
Tests: 2, Assertions: 2, Failures: 2.