[MUSIC] 0:00 [SOUND] We don't always have the option to build things perfectly the first time, 0:03 and we're always learning so that perfect way is going to change. 0:08 A great thing about PHPUnit is its wide adoption. 0:13 Almost every framework comes shipped with PHPUnit or allows for easy integration. 0:18 You can also add PHPUnit as a separate package for 0:24 any object oriented application. 0:28 Once PHPUnit is installed, you can start adding tests a little bit at a time. 0:32 When you need to fix a bug, 0:38 unit testing can be used to demonstrate that incorrect functionality. 0:40 And then keep that bug from being reintroduced after it's fixed. 0:45 When adding a new feature, unit testing can be used to verify the current 0:49 functionality before you add new features. 0:54 This provides confidence that the new feature 0:58 doesn't break the existing functionality. 1:00 Let's add PHPUnit to an existing codebase. 1:03 I'm going to start with a very basic object oriented project, 1:08 a simple cookbook. 1:12 There is a lot of functionality that could be added. 1:13 But before that, 1:16 it would be helpful to make sure that things are working as expected. 1:18 To start this process we're going to add PHPUnit and the code dungeon printer. 1:21 We could add them one at a time with Composer, 1:28 but I'm going to add them directly to a Composer.json file. 1:30 Now I can run composer install. 1:38 Let's take a look at how this application is put together, I'll open cookbook.php. 1:45 This is the main application file. 1:51 And we can see that it includes our classes and a recipe file. 1:54 These classes are what we'll need for our testing boot strap. 1:58 Let's copy those lines and create a new test folder. 2:02 Within this folder, we can create a bootstrap.php and we'll paste our lines. 2:08 We're going to be adding a phpunit.xml file to our main directory and 2:16 calling our test from there. 2:22 So these paths will work, 2:24 even though the bootstrap file is within the test's folder. 2:26 You could also update the paths to be relative to this bootstrap file. 2:29 Let's add our phpunit.xml file. 2:43 We add PHPUnit and then we're going to add our bootstrap, set this to tests. 2:49 Bootstrap.php, turn on our colors, 2:58 equals true and set printerClass equals 3:03 our Codedungeon PHPUnit, 3:09 PrettyResultPrinter\Printer. 3:17 Now we're ready to create our first test. 3:27 In the test directory, we'll create a new file and 3:30 we'll name this RecipesTest.php. 3:34 We'll use PHPUnit\Framework\TestCase. 3:41 And then we'll add class 3:50 RecipesTest extends TestCase. 3:55 We're going to create our first test. 4:03 We'll set the test and 4:05 then we'll name this canBeCreatedWithEmptyTitle, 4:09 very descriptive. 4:19 Then we'll set recipe equal to new Recipe. 4:22 We can then assert that the recipe is an instance of the recipe class. 4:28 This assertInstanceOf Recipe. 4:34 Recipe. 4:43 We can also assert that the title is an empty string. 4:45 This assertEquals an empty string and 4:49 recipe, getTitle. 4:56 Let's run our test. 5:00 Vendor/bin/phpunit and our test folder. 5:05 Helps if you spell it right. 5:18 That's also one reason it's good to copy and paste from the documentation. 5:20 But now we can see that we're running our tests. 5:24 As we start testing our code, it would be helpful to know which code is tested and 5:27 which is not. 5:32 Let's set up code coverage. 5:34