In PHP web development, how do I write unit tests?

In PHP web development, writing unit tests is an essential practice that helps ensure your code is functioning as expected. You can utilize testing frameworks such as PHPUnit to create and run tests for your PHP code. Here, we will demonstrate how to write a simple unit test for a sample class.


            <?php
            use PHPUnit\Framework\TestCase;

            class Calculator {
                public function add($a, $b) {
                    return $a + $b;
                }
            }

            class CalculatorTest extends TestCase {
                public function testAdd() {
                    $calculator = new Calculator();
                    $this->assertEquals(4, $calculator->add(2, 2));
                    $this->assertEquals(0, $calculator->add(-1, 1));
                }
            }
            ?>