PHP PHPUnit assertEmpty()用法及代码示例

assertEmpty()函数是PHPUnit中的内置函数，用于断言指定的数据持有人是否为空。如果提供的数据保存器为空，则此断言将返回true，否则返回false。如果为真，则通过断言的测试用例，否则测试用例失败。

用法:

assertEmpty( mixed $dataHolder, string $message = '' )

参数：该函数接受两个参数，如上面的语法所示。参数说明如下：

• $dataHolder:该参数可以是任何类型，代表要声明的数据持有者。
• $message:此参数采用字符串值。当测试用例失败时，此字符串消息将显示为错误消息。

以下程序说明了PHPUnit中的assertEmpty()函数：

程序1:

<?php 
use PHPUnit\Framework\TestCase; 
  
class GeeksPhpunitTestCase extends TestCase 
{ 
    public function testNegativeTestcaseForAssertEmpty() 
    { 
        $dataHolder = 'test data'; 
  
        // Assert function to test whether given 
        // data holder (variable) is empty or not 
        $this->assertEmpty( 
            $dataHolder, 
            "data holder is not empty"
        ); 
    } 
} 
  
?>

输出：

PHPUnit 8.2.5 by Sebastian Bergmann and contributors.

F                                                                   1 / 1 (100%)

Time:69 ms, Memory:10.00 MB

There was 1 failure:

1) GeeksPhpunitTestCase::testNegativeTestcaseForAssertEmpty
data holder is not empty
Failed asserting that a string is empty.

/home/shivam/Documents/geeks/phpunit/abc.php:13

FAILURES!
Tests:1, Assertions:1, Failures:1.

程序2:

<?php 
use PHPUnit\Framework\TestCase; 
  
class GeeksPhpunitTestCase extends TestCase 
{ 
    public function testPositiveTestcaseForAssertEmpty() 
    { 
        $dataHolder = ''; 
  
        // Assert function to test whether given 
        // data holder (variable) is empty or not 
        $this->assertEmpty( 
            $dataHolder, 
            "data holder is not empty"
        ); 
    } 
} 
  
?>

输出：

PHPUnit 8.2.5 by Sebastian Bergmann and contributors.

.                                                                   1 / 1 (100%)

Time:67 ms, Memory:10.00 MB

OK (1 test, 1 assertion)

注意：要使用phpunit运行测试用例，请遵循此处的步骤。另外，phpunit 7及更高版本支持assertEmpty()。