PHP PHPUnit assertIsWritable()用法及代码示例

assertIsWritable()函数是PHPUnit中的内置函数，用于断言assertiswritable是否指定文件名可写。如果给定的文件名存在并且可写，则此断言将返回true。如果为真，则通过断言的测试用例，否则测试用例失败。

用法:

assertIsWritable(string $filename[, 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：

• $filename:此参数是表示文件名的任何类型的字符串。
• $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。

以下示例说明了PHPUnit中的assertIsWritable()函数：

范例1：

<?php  
use PHPUnit\Framework\TestCase;  
    
class GeeksPhpunitTestCase extends TestCase  
{  
    public function testNegativeTestcaseForassertIsWritable() 
    {  
        $filename = "/home/lovely/Documents/php/GeeksPhpunitTestCase";  
    
        // Assert function to test whether given  
        // file name is writable or not  
        $this->assertIsWritable( 
            $filename,  
            "filename is writable or Not"
        );  
    }  
}  
    
?>

输出：

 PHPUnit 8.5.8 by Sebastian Bergmann and contributors.

F                                                                      1 / 1 (100%)

Time:86 ms, Memory:10.00 MB

There was 1 failure:

1) GeeksPhpunitTestCase::testNegativeTestcaseForassertIsWritable
filename is writable or Not
Failed asserting that "/home/lovely/Documents/php/GeeksPhpunitTestCase" is writable.

/home/lovely/Documents/php/test.php:16

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

范例2：

<?php  
use PHPUnit\Framework\TestCase;  
    
class GeeksPhpunitTestCase extends TestCase  
{  
    public function testPositiveTestcaseForassertIsWritable() 
    {  
        $filename = "/home/lovely/Documents/php";  
    
        // Assert function to test whether given  
        // file name is writable or not  
        $this->assertIsWritable( 
            $filename,  
            "filename is writable or Not"
        );  
    }  
}  
    
?>

输出：

PHPUnit 8.5.8 by Sebastian Bergmann and contributors.

.                                                 1 / 1 (100%)

Time:87 ms, Memory:10.00 MB

OK (1 test, 1 assertion)

参考：https://phpunit.readthedocs.io/en/9.2/assertions.html#assertiswritable