How do I Assert Exception Handling in PHPUnit?

Asserting Exception Handling in PHPUnit

Testing exception handling is a crucial aspect of ensuring code robustness. In PHPUnit, there's a straightforward approach to assert the occurrence of an exception.

Using Assert Methods

PHPUnit offers the expectException() method to verify the expected exception. It's recommended to provide the exception class as an argument to this method. For instance:

<code class="php"><?php $this->expectException(\InvalidArgumentException::class);
// Code that is expected to throw an InvalidArgumentException</code>

This assertion will cause the test to pass if an InvalidArgumentException is thrown. PHPUnit handles this by registering an exception handler that intercepts the exception and sets the test status to pass.

Old Way (PHPUnit

Prior to PHPUnit 5.2, the setExpectedException() method was used. The syntax is similar, but it takes three arguments:

<code class="php">$this->setExpectedException(
    \InvalidArgumentException::class,
    'Error message',
    1  // Optional exception code
);</code>

Best Practices

To ensure accurate testing, it's essential to test for a specific exception class and ensure that the exception is thrown within the appropriate scope. Additionally, it's recommended to use expectException() rather than setExpectedException() for the most up-to-date approach.

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