[PHP] Writing Unit Tests with PHPUnit, Part 2: The Tear Down

00-initial-set-up.php

<?php

namespace Pressware\Acme\Tests\API;

use PHPUnit\Framework\TestCase;

class AcmeFileTest extends TestCase
{

  private $filename;
  
  private $content;
  
  public function setUp()
  {
    $this->filename = 'testFile.txt';
    $this->content = 'This is a string of data that is meant to be written to the file.';
  }
  
  // More to come...
}

01-testing-contents.php

<?php

namespace Pressware\Acme\Tests\API;

use PHPUnit\Framework\TestCase;

class AcmeFileTest extends TestCase
{

  private $filename;
  
  private $content;
  
  public function setUp()
  {
    $this->filename = 'testFile.txt';
    $this->content = 'This is a string of data that is meant to be written to the file.';
  }

  public function testWriteReadData()
  {    
    // Writes the content to the file with the given filename.
    $fileHandle = fopen($this->filename, 'w');
    fwrite($fileHandle, $this->content);
    fclose($fileHandle);
    
    // Reads the contents of the file that was just written
    $fileHandle = fopen($this->filename, 'r');
    $contents = fread($fileHandle, filesize($this->filename));
    fclose($fileHandle);
    
    $this->assertSame($this->content, $contents);
  }

  // More to come..
}

02-full-test.php

<?php

namespace Pressware\Acme\Tests\API;

use PHPUnit\Framework\TestCase;

class AcmeFileTest extends TestCase
{

  private $filename;
  
  private $content;
  
  public function setUp()
  {
    $this->filename = 'testFile.txt';
    $this->content = 'This is a string of data that is meant to be written to the file.';
  }

  public function testWriteReadData()
  {    
    // Writes the content to the file with the given filename.
    $fileHandle = fopen($this->filename, 'w');
    fwrite($fileHandle, $this->content);
    fclose($fileHandle);
    
    // Reads the contents of the file that was just written
    $fileHandle = fopen($this->filename, 'r');
    $contents = fread($fileHandle, filesize($this->filename));
    fclose($fileHandle);
    
    $this->assertSame($this->content, $contents);
  }

  public function tearDown()
  {
    if (file_exists($this->filename)) {
      unlink($this->filename);
    }
  }
}