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How to Assert Exception Handling in PHPUnit: Does a Dedicated Assert Method Exist?

Oct 25, 2024 am 10:27 AM

How to Assert Exception Handling in PHPUnit: Does a Dedicated Assert Method Exist?

Verifying Exception Handling in PHPUnit: Is There an Assert Method?

In the realm of PHP testing, one common scenario is verifying that an exception is thrown in the code under test. PHPUnit offers an elegant solution to address this need.

Asserting Exception Occurrence with expectException()

PHPUnit provides the expectException() method to facilitate exception testing. By invoking this method in your test case, you can specify the exception type you expect to be thrown. For PHPUnit versions 5.2 and above, use expectException(InvalidArgumentException::class). In earlier versions, utilize setExpectedException(InvalidArgumentException::class).

Example Implementation

Here's an example of how to use expectException() in a test case:

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

class ExceptionTest extends PHPUnit_Framework_TestCase
{
    public function testException()
    {
        $this-&gt;expectException(InvalidArgumentException::class);
        exampleMethod($anInvalidArgument); // Add your code that throws the exception here
    }
}</code>
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Additional Resources

For more details on expectException(), refer to PHPUnit's documentation:

  • [expectException()](https://phpunit.readthedocs.io/en/latest/assertions.html#expectException)

For a comprehensive understanding of exception testing best practices, consult the following article by PHPUnit's author:

  • [Testing Exceptions in PHP](https://phpunit.de/manual/current/en/fixtures.html#fixtures.testing-exceptions)

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