How to Test Exception Handling in PHPUnit?

Testing Exception Handling in PHP Unit

When writing unit tests for your PHP code, it's essential to verify that your code handles exceptions correctly. PHPUnit offers a convenient way to test for exceptions using the expectException() method.

Problem:

How can you assert that an exception was thrown in your code during PHPUnit testing?

Answer:

PHPUnit provides the expectException() method to verify that a specified exception is thrown. This method can be used as follows:

<code class="php">$this->expectException(InvalidArgumentException::class);
// or for PHPUnit < 5.2
// $this->setExpectedException(InvalidArgumentException::class);

//...your test code that generates the exception</code>

By using this method, you can ensure that your code throws the expected exception, confirming the correct behavior of your exception handling logic.

Additional Resources:

• [expectException() PHPUnit documentation](https://phpunit.readthedocs.io/en/latest/assertions.html#exception-assertions)
• [PHPUnit author article on testing exceptions](https://blog.teamtreehouse.com/testing-for-exceptions-in-phpunit)

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