How to test custom PHP functions using PHPUnit?

How to use PHPUnit to test custom PHP functions: Install the PHPUnit library Create a PHP test case class ending with "Test", including the test method Use assertEquals in the test method to assert the expected output of the function Use the phpunit command to run the test

How to use PHPUnit to test custom PHP functions?

Introduction

PHPUnit is a popular framework for unit testing. It helps you write test cases to verify the correctness of your custom PHP functions. This article will guide you on how to use PHPUnit for unit testing of custom PHP functions.

Install PHPUnit

composer global require --dev phpunit/phpunit

Create a test case

To create a test case for a custom PHP function, create a test case with A PHP class ending with "Test" that contains test methods:

<?php

namespace Tests;

class CustomFunctionsTest extends \PHPUnit\Framework\TestCase
{
    public function testAdd()
    {
        // 断言自定义函数 add() 的工作原理
        $this->assertEquals(3, add(1, 2));
    }
}

Running Tests

To run test cases, use the PHPUnit command:

phpunit

Practical case

Suppose we have a custom PHP function add() for adding two numbers:

function add(int $a, int $b)
{
    return $a + $b;
}

We can Write a simple test case for this function:

<?php

namespace Tests;

class CustomFunctionsTest extends \PHPUnit\Framework\TestCase
{
    public function testAdd()
    {
        // 断言自定义函数 add() 的工作原理
        $this->assertEquals(3, add(1, 2));
    }
}

By running the PHPUnit command, we can see the following output in the terminal:

PHPUnit 9.5.23 by Sebastian Bergmann and contributors.

Testing:
OK (1 test, 1 assertion)

This indicates that our test has been successful.

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