Hassle-Free Filesystem Operations during Testing? Yes Please!

Virtual File System (VFS) simulates file system operations in unit tests, avoiding the hassle of cleaning temporary files. This article describes how to use the vfsStream library to simplify the testing of file system operations in PHP unit tests.

First of all, we have a simple FileCreator class for creating files:

<?php
namespace App\Tests;

class FileCreator extends PHPUnit_Framework_TestCase {
    public static function create($path, $name, $content) {
        $filename = rtrim($path, '/') . '/' . $name;
        return file_put_contents($filename, $content) !== false;
    }
}

The traditional method requires setting a temporary directory in the setUp() method and cleaning the temporary files in the tearDown() method:

<?php
namespace App\Tests;

class FileCreatorTest extends PHPUnit_Framework_TestCase {
    protected $path;

    public function setUp() {
        $this->path = sys_get_temp_dir();
    }

    public function tearDown() {
        $file = $this->path . '/test.txt';
        if (file_exists($file)) {
            unlink($file);
        }
    }

    public function testCreate() {
        $this->assertTrue(FileCreator::create($this->path, 'test.txt', 'Lorem ipsum'));
        $this->assertFileExists($this->path . '/test.txt');
    }
}

This method is prone to errors when handling multiple files or test interrupts.

Use vfsStream to avoid these problems. First, use Composer to install:

composer require mikey179/vfsStream

Then, modify the test class:

<?php
use org\bovigo\vfs\vfsStream;

class FileCreatorTest extends PHPUnit_Framework_TestCase {
    protected $vfs;

    public function setUp() {
        $this->vfs = vfsStream::setup('testDirectory');
    }

    public function testCreate() {
        $path = vfsStream::url('testDirectory');
        $this->assertTrue(FileCreator::create($path, 'test.txt', 'Lorem ipsum'));
        $this->assertFileExists($this->vfs->getChild('test.txt')->url());
    }
}

vfsStream::setup() Created a virtual file system where all operations are performed in memory without manual cleaning. After the test is completed, the virtual file system will be automatically destroyed.

vfsStream provides more powerful features such as permission control, file size control and complex directory structure simulation. This method avoids problems caused by temporary file cleaning failure in testing and improves the reliability of the test.

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