How to use PHP7.0 for unit testing?

PHP is a widely used programming language, and unit testing is an essential technology to ensure code quality and stability. As an important version of PHP, PHP7.0 provides a more convenient and efficient way for unit testing. In this article, we will introduce how to use PHP7.0 for unit testing so that your code is more robust and secure.

What is unit testing?

Unit testing refers to the testing method that checks and verifies the smallest testable unit in the software. The so-called minimum testable unit refers to the smallest unit that cannot be decomposed in software design, usually a function or a method. This testing method is independent of the overall system and is a quality inspection method for programmers' code. In addition to ensuring the quality and reliability of the code, it can also save testing costs and speed up the development process.

How to use PHP7.0 for unit testing?

Below, we will introduce how to use PHP7.0 for unit testing.

1. Installing PHPUnit

PHPUnit is a unit testing framework for the PHP language. We can use Composer to install PHPUnit.

$ composer require phpunit/phpunit

After the installation is completed, a "vendor" directory will be generated in our current directory, which stores PHPUnit and other dependent packages.

2. Writing Tests

Now, we write test cases for our code. Imagine we have the following PHP file that needs to be tested:

function add($a, $b){

  return $a + $b;

}

In order to test this function, we can create a file named "test.php" and write the following test code in it:

use PHPUnitFrameworkTestCase;

require 'path/to/php/file/add.php';

class AddTest extends TestCase {

    public function testAdd()

    {

        $this->assertEquals(3, add(1, 2));

        $this->assertEquals(5, add(2, 3));

    }

}

In this test case, we use the assertEquals() method of PHPUnit to test the addition of 1 and 2 and the addition of 2 and 3 using the add() method.

3. Run the test

After writing the test case, we need to run the test case to verify whether the code is correct. In the command line window, use the following command to run the test:

$ vendor/bin/phpunit test.php

In this example, "test.php" is the test we wrote For the test case, use PHPUnit to run the test file. The test results will be displayed on the command line.

If one of the tests fails, you can use other PHPUnit assertion methods (for example: assertGreaterThan() or assertContains()) to locate the problem.

Summary

Using PHP7.0 for unit testing is an important means to improve code quality and reliability. In this article, we have introduced the basic steps and methods for unit testing using the PHPUnit framework. Using this method, you can verify whether the function of the code is correct, save testing costs, and optimize the development process.

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