PHP PHPUnit assertEmpty()用法及代碼示例

assertEmpty()函數是PHPUnit中的內置函數，用於斷言指定的數據持有人是否為空。如果提供的數據保存器為空，則此斷言將返回true，否則返回false。如果為真，則通過斷言的測試用例，否則測試用例失敗。

用法:

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

參數：該函數接受兩個參數，如上麵的語法所示。參數說明如下：

• $dataHolder:該參數可以是任何類型，代表要聲明的數據持有者。
• $message:此參數采用字符串值。當測試用例失敗時，此字符串消息將顯示為錯誤消息。

以下程序說明了PHPUnit中的assertEmpty()函數：

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"
        ); 
    } 
} 
  
?>

輸出：

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"
        ); 
    } 
} 
  
?>

輸出：

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運行測試用例，請遵循此處的步驟。另外，phpunit 7及更高版本支持assertEmpty()。