PHP PHPUnit assertCount()用法及代码示例

assertCount()函数是PHPUnit中的内置函数，用于断言一个数组，以包含与给定计数值相同数量的元素。如果数组仅包含确切数量的元素，则此断言将返回true，因为给定count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:

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

参数：该函数接受三个参数，如上面的语法所示。参数说明如下：

• $expectedCount:此参数是整数，是数组的预期元素数。
• $array:此参数是一个数组，assert函数将为其检查是否包含与给定计数值相同数量的元素。
• $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assertCount()函数：

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"
        ); 
    } 
} 
  
?>

输出：

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"
        ); 
    } 
} 
  
?>

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assertCount()。