How to write a test suite in PHPUnit?

@brandy 

To write a test suite in PHPUnit, you can follow the steps outlined below:

1. Install PHPUnit: First, you need to make sure PHPUnit is installed on your system. You can install it using Composer by running the following command in your project directory:

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composer require --dev phpunit/phpunit

1. Create a new directory for your tests: Create a directory in your project to store all your test files. For example, you can create a directory called "tests" at the root of your project.
2. Create a test class: Inside the "tests" directory, create a new PHP file for your test class. In this file, define a class that extends the PHPUnitFrameworkTestCase class. This class will contain the test methods.

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// tests/MyTest.php
use PHPUnitFrameworkTestCase;

class MyTest extends TestCase
{
    // Test methods will be defined here
}

1. Define test methods: Inside the test class, you can define test methods to test different parts of your code. Each test method should start with the word "test" and should include assertions to verify the expected behavior of your code.

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// tests/MyTest.php
use PHPUnitFrameworkTestCase;

class MyTest extends TestCase
{
    public function testAddition()
    {
        $result = 2 + 2;
        $this->assertEquals(4, $result);
    }

    public function testStringConcatenation()
    {
        $result = "Hello" . " " . "World";
        $this->assertEquals("Hello World", $result);
    }
}

1. Run the test suite: To run the test suite, open a terminal and navigate to your project's root directory. Then, run the PHPUnit executable and provide the path to your test suite file. PHPUnit will automatically discover and execute all the test methods defined in your test class.

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vendor/bin/phpunit tests/MyTest.php

You will see the output of the test execution, including information about which tests passed and which tests failed.

That's it! You now know how to write a basic test suite in PHPUnit. You can continue adding more test methods and test classes to cover different parts of your codebase.