How to implement unit testing of PHP functions?

PHP function unit testing can be achieved through the following steps: Install PHPUnit Create a test case Write a test case Write the tested function Run the test case

Unit of PHP function How testing is implemented

Introduction

Unit testing is essential to ensure the reliability and correctness of the code. This article will guide you step by step to implement unit testing for functions in PHP.

Step 1: Install PHPUnit

Use Composer to install PHPUnit:

composer require phpunit/phpunit

Step 2: Create test cases

Create a test case class in the tests directory, such as MyFunctionsTest.php:

<?php

namespace Tests;

use PHPUnit\Framework\TestCase;

class MyFunctionsTest extends TestCase
{
    public function testAddFunction()
    {
        // 测试用例...
    }
}

Step 3: Write test cases

Write a test method for the function to be tested, such as:

public function testAddFunction()
{
    $a = 3;
    $b = 4;
    $expected = 7;

    $actual = add($a, $b);

    $this->assertEquals($expected, $actual);
}

Step 4: Write the tested function

at## Define the function to be tested in #functions.php:

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

Step 5: Run the test case

Run PHPUnit in the command line:

vendor/bin/phpunit

Practical case

The following is a practical case to demonstrate how to test the

add function:

// tests/MyFunctionsTest.php
public function testAddFunction()
{
    $testCases = [
        [3, 4, 7],
        [0, 1, 1],
        [-1, -2, -3]
    ];

    foreach ($testCases as $testCase) {
        $a = $testCase[0];
        $b = $testCase[1];
        $expected = $testCase[2];

        $actual = add($a, $b);

        $this->assertEquals($expected, $actual);
    }
}

This test case covers a variety of Scenarios and use data providers for parameterized testing to ensure more situations are covered.

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