What are some TDD challenges I can try in PHP?

What are some TDD challenges I can try in PHP?

Here are a few TDD challenges you can try in PHP:

1. Create a simple calculator that performs basic operations.
2. Build a to-do list application with CRUD functionality.
3. Develop a unit test for a function that checks if a string is a palindrome.
4. Implement a basic authentication system with user registration and login.
5. Write tests for a function that sorts an array of numbers.

Can you give me an example of a test case for the calculator?

Sure! For a calculator that adds two numbers, a test case could look like this:

public function testAddition() {
    $calculator = new Calculator();
    $result = $calculator->add(2, 3);
    $this->assertEquals(5, $result);
}

What if I want to test edge cases?

Great question! For edge cases, you might want to test:

• Adding zero to a number.
• Adding negative numbers.
• Very large numbers.

For example:

public function testAdditionWithZero() {
    $calculator = new Calculator();
    $result = $calculator->add(0, 5);
    $this->assertEquals(5, $result);
}