PHPUnit: How to Assert That an Exception Was Thrown
Автор: vlogize
Загружено: 2024-07-17
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Learn how to use PHPUnit to assert that an exception was thrown in your PHP unit tests. This guide covers best practices and examples for ensuring your code handles errors as expected.
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PHPUnit: How to Assert That an Exception Was Thrown
Testing code for exceptions is an important part of unit testing, as it ensures that your application behaves correctly in error situations. PHPUnit provides several methods to assert that an exception was thrown during the execution of your tests. This guide will walk you through the process of asserting exceptions in PHPUnit.
Using the expectException Method
The most straightforward way to assert that an exception is thrown in PHPUnit is by using the expectException method. This method specifies the type of exception you expect your code to throw.
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In this example, if someFunctionThatShouldThrowException does not throw an Exception, the test will fail.
Specifying the Exception Message
Sometimes you need to assert not only that an exception was thrown but also that it has a specific message. You can achieve this using the expectExceptionMessage method.
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This ensures that the exception thrown not only matches the type but also contains the expected message.
Checking the Exception Code
In addition to the exception type and message, you might want to assert the exception code. Use the expectExceptionCode method for this purpose.
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This method ensures that the thrown exception has the specific code you expect.
Asserting Multiple Properties
You can combine these methods to assert multiple properties of an exception in a single test.
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This approach makes your tests more robust by checking all relevant aspects of the exception.
Testing for Exceptions in Closures
In some cases, you may want to test for exceptions within a closure. This is useful when the code you are testing is more complex or if you need to assert that an exception is thrown in a specific context.
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This method provides flexibility in structuring your tests and isolating the code that should throw the exception.
Conclusion
Asserting that an exception was thrown in PHPUnit is a crucial aspect of ensuring your application handles errors correctly. By using the expectException, expectExceptionMessage, and expectExceptionCode methods, you can create comprehensive tests that validate the behavior of your code under various error conditions. Understanding and utilizing these methods will help you write more reliable and maintainable tests, contributing to the overall quality of your PHP applications.
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