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Theo Kouzelis:
Improving Readability of PHPUnit Data Providers
April 10, 2015 @ 12:01:28

Theo Kouzelis has a recent tutorial posted showing you how to make your PHPUnit tests a bit cleaner with the help of data providers, a built-in tool for PHPUnit that allows for easier validation of larger datasets.

When writing tests I try to describe the test in the function name. I use the format testDoesSomethingWhenPassedSomething to first describe the assertion and then the context. [...] When I have many data sets running against the same test I will use the frameworks data providers to make the code less verbose.

He includes code examples to show both the difference between the single data tests and one using a set of email addresses to validate their correctness. He notes that the error message using data providers can be confusing (and maybe hide the real problem) so he offers a solution to make it more readable: associative arrays. The trick is that PHPUnit uses the key to display the error and by making this unique you can make the error output more informative.

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dataprovider tutorial readability phpunit unittest associative array

Link: http://theo.codes/php/improving-readability-of-phpunit-data-providers.html

James Fuller:
Use @dataProvider to reduce duplication and improve the maintainability of your tests
January 31, 2014 @ 12:50:39

Code duplication is a common problem for developers. It's easy to copy and paste code around your application, but you're asking for trouble. Unfortunately, this kind of problem also extends to unit tests. In this new post to his site James Fuller looks at one way to help with this - using the @dataProvider to limit the repetitive data sets across tests.

PHPUnit offers a handy annotation called @dataProvider which can be used for all sorts of handy testing situations. Typically you will use this to feed in a wide variety of data into the same test to ensure that the system-under-test can handle a variety of inputs. Over time I have discovered a few other neat uses for dataProvider methods that I want to share with you today.

He provides some code samples showing how to use the dataProvider in a few tests, setting up an "allowed word" example. He gets a bit more complex with another test that takes in multiple parameters to "mix colors". In his last example he shows a data provider that converts names from camelCase to user_scores.

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unittest dataprovider duplication dataset tutorial

Link: http://www.jblotus.com/2014/01/29/use-dataprovider-to-reduce-duplication-and-improve-the-maintainability-of-your-tests/


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