To test command-line applications and scripts with PHPUnit, you can follow these steps:
Install PHPUnit: Start by installing PHPUnit if you haven't already. You can install it globally or within your project using Composer.
Write test cases: Create test cases for your command-line application or script. Test cases are typically written as PHP classes that extend PHPUnit\Framework\TestCase. These test cases should cover all the different scenarios and functionalities of your command-line application.
For example, if you have a script that calculates the factorial of a number, you might write a test case that checks if the script returns the correct result when given a specific input.
Execute the command-line application/script within the test case: In your test case, you need to execute the command-line application or script you want to test. You can use the exec() or shell_exec() function to execute the command or script.
For example, if your command-line application is a PHP script called my_script.php, you can use exec('php my_script.php arg1 arg2') to execute it.
Assert the expected output or behavior: After executing the command-line application or script, you need to assert the expected output or behavior. PHPUnit provides various assertion methods, such as assertEquals(), assertTrue(), assertContains(), etc., that you can use to compare the actual output with the expected one.
For example, if your command-line application should output "120" when given the input "5" (as it calculates the factorial), you can use assertEquals('120', $output) to assert that the output is 120.
Run the tests: Finally, run your PHPUnit test suite to execute the test cases and see the results. You can run the tests using the phpunit command or any other method provided by your development environment.
For example, if you have installed PHPUnit globally, you can run the tests by executing the phpunit command in your project's root directory.
By following these steps, you can effectively test your command-line applications and scripts using PHPUnit.