# Posts

### Using CSS modules in react when testing with enzyme

Use CSS modules classes as selectors for your tests, and have better snapshots.

### Testing Exceptions in PHPUnit

Last week i gave 10 phpunit tips. This week we’ll take a look at testing exceptions, which wasn’t covered in that post. Lets start with some example code that we will be testing. We have the Email and EmailValidator classes. Email is a value object that makes sure it is a valid email. We use the EmailValidator to make sure that the emails are only from our company. //Email.php final class Email { private function __construct( private string $email ){} public static function create(string$email): self { if (!

### 10 PHPUnit Tips

PHPUnit is the defacto testing framework for PHP. In this post i want to share with you my top 10 tips for PHPUnit. I’m using PHPUnit 9.5, but most of these apply to older versions as well. So, lets get this party started. 1: Stop using assertEquals One of the most common mistakes is using assertEquals. Instead, you should be using assertSame. When using equals we are doing an == check, instead of ===.

### Help my Doctrine migrations are broken!

Recently we ran into a problem with doctrine migrations. The schema was manually edited, and wrong migrations were committed to the repository. For a dev (and even staging) env you could just drop the database, fix the migrations, and run them again. But we didn’t want to lose our production data. So how do we fix this? We really had 2 problems. Our migrations were wrong, and the (production) database was not in the correct state.

### A problem with Twig

I’m a fan of twig, and wouldn’t consider moving back to plain php. But, it does come with a few problems. In this post we’ll explore one of the problems i have with twig, and how to work around it. The problem When you use a twig file, you do not know what variables it needs, what variables i can use, and what types those variables should be. You have to read the template, or execute it and see what errors you get.

Don’t worry, this isn’t a ‘what type of sandwich are you?’ kinda post. Instead we’ll look at how we can safely add types to our legacy code. Adding types There are really two ways of adding types. You either declare what you want your types to be, or you declare what the types can be. When writing new code we should always be precise in our types, so we declare what we want.

### You should be using PHPStans bleeding edge

Does your project use PHPStan? Then you really should be using the bleeding edge config, regardless of what level you are running. It will make transition to the newer version much easier. What is bleeding edge To preserve backwards compatibility as much as possible, new rules, and new settings are delayed until the next major version. For example, using null coalesce on a variable that can not be null will be an error in the next version.

### PHPUnit beyond basics: Dataproviders

Once you have set up your first unit tests, and you have a good configuration, its time to add a lot of tests. Lets take a look at using data providers, as a way to test with a lot of data. For this example we’ll test a piece of code that is supposed to do the following. Given the array ['a', 'b', 'c'], return the string a a-b a-b-c b b-c c.

### PHPUnit beyond basics: configuration

If you just got started with PHPUnit, its configuration file may be a bit daunting. Today we’re gonna walk through (what i consider) the ideal config file. If you’re just here to copy paste the config, then you can find it at the bottom 👇. A minimum phpunit.xml may look like this: <?xml version="1.0" encoding="UTF-8"?> <phpunit> <testsuites> <testsuite name="Tests"> <directory>tests/</directory> </testsuite> </testsuites> </phpunit> The first thing we can do to improve this, is link the xsd.

### Every day design pattern: Builder

Just like the factory pattern, the builder is a creational pattern, meaning it is about how objects are created. But unlike a factory, a builder allows you to build an object in parts. I tend to use it for creating objects that take a configuration. Lets start with an example. This class builds a guzzle client, with a certain config. Normally we have a timeout of 10 seconds, with a 5 second timeout for both connect and read.