How to test custom PHP functions?

How to test custom PHP functions? You can write unit tests for custom PHP functions by following these steps: Create a test class that inherits from PHPUnit\Framework\TestCase. Define a test method for each function you want to test, such as testAddNumbers(). In the test method, set the input data to be passed to the function. Call a function and store its output in a variable. Use PHPUnit's assertion methods (such as assertEquals()) to compare the output of a function to the expected result.

How to Test Custom PHP Functions

Custom PHP functions are a practical way to keep your code simple and reusable when writing complex code. However, it is crucial to ensure that these functions work as expected, and this is where unit testing comes into play.

Writing Unit Tests for PHP Functions

Unit tests are smaller tests that test a single function or method. PHPUnit is a popular PHP testing framework that provides powerful support for unit testing.

To write unit tests for PHP functions, follow these steps:

1. Create a test class: Create a unit test that inherits from PHPUnit\Framework\TestCase test class.
2. Define test method: Define a test method for each function to be tested, such as testAddNumbers().
3. Set test data: In the test method, set the input data to be passed to the function.
4. Execute function: Call a function and store its output in a variable.
5. Assert results: Use PHPUnit's assertion methods (such as assertEquals()) to compare the output of the function with the expected result.

Practical case

Let's write a addNumbers() function and unit test it:

// addNumbers() 函数
function addNumbers(int $a, int $b): int {
    return $a + $b;
}

// TestAddNumbers 测试类
class TestAddNumbers extends PHPUnit\Framework\TestCase {
    public function testAddPositiveNumbers() {
        // 设置输入数据
        $a = 5;
        $b = 10;

        // 执行函数
        $result = addNumbers($a, $b);

        // 断言结果
        $this->assertEquals(15, $result);
    }
}

Run this test, it should pass, indicating that the addNumbers() function works as expected.

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