Test PHP headers with PHPUnit

The issue is that PHPUnit will print a header to the screen and at that point you can’t add more headers.

The work around is to run the test in an isolated process. Here is an example

<?php

class FooTest extends PHPUnit_Framework_TestCase
{
    /**
     * @runInSeparateProcess
     */
    public function testBar()
    {
        header('Location : http://foo.com');
    }
}

This will result in:

$ phpunit FooTest.php
PHPUnit 3.6.10 by Sebastian Bergmann.

.

Time: 1 second, Memory: 9.00Mb

OK (1 test, 0 assertions)

The key is the @runInSeparateProcess annotation.

If you are using PHPUnit ~4.1 or something and get the error:

PHP Fatal error:  Uncaught Error: Class 'PHPUnit_Util_Configuration' not found in -:378
Stack trace:
#0 {main}
  thrown in - on line 378

Fatal error: Uncaught Error: Class 'PHPUnit_Util_Configuration' not found in - on line 378

Error: Class 'PHPUnit_Util_Configuration' not found in - on line 378

Call Stack:
    0.0013     582512   1. {main}() -:0

Try add this to your bootstrap file to fix it:

<?php
if (!defined('PHPUNIT_COMPOSER_INSTALL')) {
    define('PHPUNIT_COMPOSER_INSTALL', __DIR__ . '/path/to/composer/vendors/dir/autoload.php');
}