PHP unit testing: how to use it in continuous integration

Using PHP unit tests in a continuous set can ensure the stability of the code: set up a CI environment (such as Travis CI); install a PHP unit test framework (such as PHPUnit); write unit tests to check specific expected output; integrate tests into CI configuration to automatically execute tests every time the code changes.

PHP Unit Testing: How to use it in continuous integration

Introduction

Unit testing is a way to verify during development that your code works as expected. By including unit tests in your continuous integration (CI) process, you can ensure the stability and reliability of your code.

Set up a CI environment

First, set up a CI environment, such as Travis CI or CircleCI. These services allow you to automatically build and test your code.

Install a PHP unit testing framework

Next, install a PHP unit testing framework such as PHPUnit or Codeception. These frameworks provide tools for writing and running tests.

Writing Unit Tests

For each feature you want to test, write a unit test. Tests should check for specific expected output.

class MyTest extends PHPUnit_Framework_TestCase
{
  public function testSomething()
  {
    $result = myFunction();
    $this->assertEquals('expected', $result);
  }
}

Integrate tests into CI

Integrate your tests into your CI setup. CI will then automatically run your tests every time the code changes.

CI Configuration Example (Travis CI)

language: php

script:
  - composer install
  - vendor/bin/phpunit

Practical Case

Consider a simple example with a calculation Function that is the sum of two numbers.

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

We can write unit tests for this function:

class SumTest extends PHPUnit_Framework_TestCase
{
  public function testSum()
  {
    $this->assertEquals(3, sum(1, 2));
    $this->assertEquals(5, sum(2, 3));
  }
}

By running these tests in the CI process, we can ensure that the function works properly even if the code changes slightly.

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