How to Test Exception Handling in PHP with PHPUnit?

Testing Exception Handling in PHP with PHPUnit

When testing code that interacts with exceptions, it becomes crucial to verify whether specific exceptions are thrown as expected. PHPUnit, a popular PHP testing framework, provides a convenient way to assert the occurrence of exceptions during testing.

Using expectException() to Assert Exceptions

Problem: How can we assert that an exception is thrown in our tested code?

Answer: PHPUnit offers the expectException() method to assert the occurrence of an exception. By specifying the expected exception class as an argument to this method, we can ensure that the correct exception has been thrown.

Code Example:

<code class="php">require_once 'PHPUnit/Framework.php';

class ExceptionTest extends PHPUnit_Framework_TestCase
{
    public function testException()
    {
        $this-&gt;expectException(InvalidArgumentException::class);

        // Code that generates the exception
        exampleMethod($anInvalidArgument);
    }
}</code>

Additional Notes:

• For PHPUnit versions prior to 5.2, the setExpectedException() method should be used instead of expectException().
• The PHPUnit documentation provides extensive details on expectException().
• For best practices and a deeper understanding of exception testing in PHP, consider reading the article by the author of PHPUnit.

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