PHP PHPUnit assertCount()用法及代碼示例

assertCount()函數是PHPUnit中的內置函數，用於斷言一個數組，以包含與給定計數值相同數量的元素。如果數組僅包含確切數量的元素，則此斷言將返回true，因為給定count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:

assertCount( integer $expectedCount, array $array, string $message = '' )

參數：該函數接受三個參數，如上麵的語法所示。參數說明如下：

• $expectedCount:此參數是整數，是數組的預期元素數。
• $array:此參數是一個數組，assert函數將為其檢查是否包含與給定計數值相同數量的元素。
• $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assertCount()函數：

程序1:

<?php 
use PHPUnit\Framework\TestCase; 
  
class GeeksPhpunitTestCase extends TestCase 
{ 
    public function testNegativeTestcaseForAssertCount() 
    { 
        $testArray = array(1, 2, 3, 4); 
  
        // Assert function to test whether testArray contains 
        // same number of elements as expectedCount 
        $expectedCount = 3; 
  
        $this->assertCount( 
            $expectedCount, 
            $testArray, "testArray doesn't contains 3 elements"
        ); 
    } 
} 
  
?>

輸出：

PHPUnit 8.2.5 by Sebastian Bergmann and contributors.

F                                                                   1 / 1 (100%)

Time:66 ms, Memory:10.00 MB

There was 1 failure:

1) GeeksPhpunitTestCase::testNegativeTestcaseForAssertCount
testArray doesn't contains 3 elements
Failed asserting that actual size 4 matches expected size 3.

/home/shivam/Documents/geeks/phpunit/abc.php:14

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

程序2:

<?php 
use PHPUnit\Framework\TestCase; 
  
class GeeksPhpunitTestCase extends TestCase 
{ 
    public function testPositiveTestcaseForAssertCount() 
    { 
        $testArray = array(1, 2, 3, 4); 
  
        // Assert function to test whether testArray contains 
        // same number of elements as expectedCount 
        $expectedCount = 4; 
  
        $this->assertCount( 
            $expectedCount, 
            $testArray, "testArray contains 3 elements"
        ); 
    } 
} 
  
?>

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assertCount()。