How can unit testing be implemented to verify the functionality of custom PHP functions?

To verify the functionality of custom PHP functions through unit testing, you can use a testing framework like PHPUnit. By writing test cases that cover different scenarios and expected outcomes of the function, you can ensure that the function behaves as intended. These tests can be automated and run regularly to catch any regressions or unexpected behavior. 

// Example of a custom PHP function to be tested
function add($a, $b) {
    return $a + $b;
}

// PHPUnit test case for the add function
class CustomFunctionTest extends \PHPUnit\Framework\TestCase {
    public function testAdd() {
        $this->assertEquals(4, add(2, 2));
        $this->assertEquals(0, add(-2, 2));
        $this->assertEquals(10, add(5, 5));
    }
}

Keywords

unit testing PHP functions functionality verification custom functions implementation

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