TTD Approach in Laravel
Tags: laravel, php, testing, productivity
Published: 2023-01-07 19:12:11

## Test-driven development
 (TDD) is a software development approach that involves writing tests for your code before you actually write the code itself. Sounds a bit backwards, right? But bear with me-this approach can actually be a great way to build high-quality, bug-free applications.

In the context of Laravel, TDD involves writing tests for your application's controllers, models, and other components using PHPUnit. You can then use these tests to drive the development of your application, ensuring that everything is working as expected.

So how do you get started with TDD in Laravel? Follow these simple steps:

## Step 1: Preheat your testing oven

Before you can start cooking up some tasty tests, you'll need to make sure you have all the necessary ingredients. In the case of Laravel, that means installing PHPUnit and setting up your test case.

To install PHPUnit, simply run the following command:

```
composer require --dev phpunit/phpunit

```
Next, you'll want to create a test case using the php artisan make:test command. This will generate a skeleton test case class for you to customize. Just think of it as a recipe for testing.

## Step 2: Write a test

Now it's time to start writing your tests. But wait-doesn't TDD involve writing the tests before the code? Yes, that's correct! The idea is to write a test for a specific feature or behavior that you want your application to have. Then, when you run the test, it should fail because the code doesn't exist yet.

For example, let's say you want to create a new user in your application. You could write a test that verifies that the user is created and stored in the database correctly. Here's what that might look like:

```
public function testCreateUser()
{
    // Arrange
    $user = new User();
    $user->name = 'John Smith';
    $user->email = 'john@example.com';

    // Act
    $user->save();

    // Assert
    $this->assertDatabaseHas('users', [
        'email' => 'john@example.com'
    ]);
}
```

## Step 3: Watch the test fail

Once you have written your test, it's time to run it. But don't be surprised if it fails! Remember, we haven't written the actual code yet, so the test is supposed to fail. This is an important part of the TDD process because it helps ensure that the test is actually testing something and that it is set up correctly.

## Step 4: Write the code

With the test in place, it's now time to write the actual code that makes the test pass. In our example, this would involve writing the code to create a new user and store it in the database. Here's what that code might look like:

```
<?php

class User
{
    public $name;
    public $email;

    public function save()
    {
        // Code to insert user into database goes here
    }
}
```

## Step 5: Watch the test pass

With the code in place, it's time to run the test again. This time, it should pass! Seeing a passing test is a great feeling and helps give you confidence that your code is working as expected.

## Step 6: Refactor and repeat

The final step in the TDD process is to refactor your code as needed and then rinse and repeat the process for the next feature or behavior that you want to test. By following this iterative process, you can build your application piece by piece, ensuring that everything is working correctly along the way.

_**So why should you bother with TDD?**_ There are several benefits to this approach:

- It helps you write cleaner, more efficient code because you are only writing the code that is strictly necessary to make the tests pass.
- It gives you confidence in your code because you can be sure that everything is working as expected.
- It helps you catch bugs early on in the development process, before they become a problem.

**In conclusion**, test-driven development is a powerful software development approach that can help you build high-quality, bug-free applications. By following the simple steps outlined above, you can easily get started with TDD in Laravel and start reaping the benefits of this approach. Happy testing!