How to unit test PHP functions

PHP unit testing is used to verify the functionality of independent functions or modules, using the PHPUnit framework. It includes the following steps: install PHPUnit, create a test class that ends with Test and inherits from PHPUnit_Framework_TestCase, mark the @test annotation test method, use assertion methods to verify the results (such as assertEquals(), assertTrue()), and run the test (phpunit).

PHP Function Unit Testing

Unit testing is testing of independent functions or small modules to ensure that they work as expected . Unit testing in PHP is typically done using the PHPUnit testing framework.

Install PHPUnit

Install PHPUnit globally through Composer:

composer global require phpunit/phpunit

Using PHPUnit

To create a For a test case, first create a class ending with Test and inherit from PHPUnit_Framework_TestCase. Then, use the @test annotation to mark the test method:

class MyFunctionTest extends PHPUnit_Framework_TestCase {

    @test
    public function testMyFunction() {
        // 编写要测试的代码
    }
}

Assertion method

PHPUnit provides a variety of assertion methods for verifying code Expected results:

• assertEquals($expected, $actual) Verifies that $expected and $actual are equal.
• assertTrue($condition) Verify that $condition is true.
• assertFalse($condition) Verify that $condition is false.

Practical case

Consider a function that returns the length of a given stringstrLength:

function strLength($str) {
    return strlen($str);
}

We can Write a unit test to verify the function:

class StrLengthTest extends PHPUnit_Framework_TestCase {

    @test
    public function testStrLength() {
        $this->assertEquals(3, strLength('foo'));
        $this->assertEquals(0, strLength(''));
    }
}

Run the test

To run the test, use the following command:

phpunit

This will run all @test methods in classes ending with Test. If the test passes, a green "OK" message will be displayed, if it does not pass, a red "FAIL" message will be displayed.

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