PHPUnit is a testing framework for PHP.
You can also download it on Github. Here is the Git:
PHPUnit Composer Method
Add a dependency your project's composer.json file if you use Composer (dependency manager for PHP)
composer require --dev phpunit/phpunit ^6.0
Writing Tests for PHPUnit
This is from the PHPUnit documentation. This simple example shows how to test PHP's array operations.
class StackTest extends TestCase
public function testPushAndPop()
$stack = ; // create an empty array
$this->assertEquals(0, count($stack)); // test if the array $stack has 0 items
array_push($stack, 'foo'); // push an item called 'foo' into the array $stack
$this->assertEquals('foo', $stack[count($stack)-1]); // test the item at $stack 1-1 is equal to 'foo'
$this->assertEquals(1, count($stack)); // test if the array $stack has 1 item
$this->assertEquals('foo', array_pop($stack)); // pop the 'foo' item from the array $stack
$this->assertEquals(0, count($stack)); // test if the array $stack contains 0 items
Unit Tests are primarily written as a good practice to help developers identify and fix bugs, to refactor code and to serve as documentation for a unit of software under test. To achieve these benefits, unit tests ideally should cover all the possible paths in a program. One unit test usually covers one specific path in one function or method. However, a test method is not necessary an encapsulated, independent entity. Often there are implicit dependencies between test methods, hidden in the implementation scenario of a test. --Adrian Kuhn et. al.