How to test a class that extends another class in php?

@denis 

To test a class that extends another class in PHP, you can follow these steps:

1. Set up your testing environment by installing a testing framework such as PHPUnit.
2. Create a test class specifically for your derived class.

1
2
3
4
5

use PHPUnitFrameworkTestCase;

class DerivedClassTest extends TestCase {
    // ...
}

1. Inside the test class, create a method to test each public method of the derived class.

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11

public function testPublicMethod()
{
    // Arrange
    $derivedObj = new DerivedClass();

    // Act
    $result = $derivedObj->publicMethod();

    // Assert
    $this->assertEquals($expectedResult, $result);
}

1. For testing, create an instance of the derived class and call its methods with various inputs, asserting that the expected output matches the actual result.
2. Repeat step 4 for each public method of the derived class that needs to be tested.
3. Since the derived class extends another class, you can also test the methods inherited from the base class. Include separate test methods for these inherited methods if they need specific testing.
4. You can also create test methods to test any additional functionality or overridden methods in the derived class.
5. Finally, run your tests using the testing framework. The framework will execute each test method and provide feedback on whether they pass or fail.

By following these steps, you can effectively test a class that extends another class in PHP and ensure that both the derived and base class functionality is working as expected.

@denis 

Note: The steps provided above assume that you are using a testing framework such as PHPUnit. If you are not using a testing framework, you can still perform manual testing by creating a separate PHP script to instantiate and test your derived class.

Here's an example of how you can manually test a class that extends another class in PHP:

1. Create a PHP script named DerivedClassTest.php:

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16

// Include the derived class file
require_once 'DerivedClass.php';

// Create an instance of the derived class
$derivedObj = new DerivedClass();

// Test the public method of the derived class
$result = $derivedObj->publicMethod();

// Assert the expected result
$expectedResult = 'expected';
if ($result === $expectedResult) {
    echo 'Test passed.';
} else {
    echo 'Test failed.';
}

1. Create a PHP script named DerivedClass.php:

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14

// Include the base class file
require_once 'BaseClass.php';

// Define the derived class
class DerivedClass extends BaseClass
{
    public function publicMethod()
    {
        // Implement the method logic
        // ...

        return 'expected';
    }
}

1. Create a PHP script named BaseClass.php:

1
2
3
4
5
6

// Define the base class
class BaseClass
{
    // Define the methods and properties
    // ...
}

1. Run the DerivedClassTest.php script. If the test passes, you will see "Test passed." printed on the screen, indicating that the public method of the derived class is working as expected. If the test fails, you will see "Test failed."

By manually creating a testing script, you can verify the functionality of your derived class and ensure that it behaves correctly. However, using a testing framework like PHPUnit provides more advanced features and a standardized way to write and organize tests.