The non-elegant solution also has no way to deal appropriately with dependencies.įortunately, there is an excellent tool that has been around since 2001, PHPUnit. The above setup makes it very easy to break this.
PHPUNIT MOCKS VS STUBS CODE
The code should be executed from a clean slate every time in addition to testing small chunks of code. First, unit tests should run in total isolation. The very basic way I show above works, but it fails at a few things. There is a better and more accepted way to write tests. phpt extension) test output directly, and not necessarily failure conditions. The big difference would be that PHP tests (usually denoted by a. This is very close to what the PHP Test Runner does for the core PHP language itself. From here, you could write a test runner which searches through your source code for *.test.php files and can execute the files, and stop when it encounters an error. Is any of this super elegant? No, but now anyone can run the test with php, and that is better than nothing. We can then build onto this script and build more test scripts for more of our codebase. We have a small test that makes sure convert() does what we expect it to, and nothing more or less. We can now change the internal implementation of the convert() method whenever we need to and make sure it does not break. Throw \Exception('Text does not match!') Īnyone can run this script to make sure the Slugifier::convert() method is working as expected. A unit test ensures the general logic works under a variety of inputs, irrespective of additional real dependencies like a database.Ĭonsider the block of code in Listing 1, where we have a class that turns a string into a URL-friendly slug. The basic idea of a unit test is to take a small block of code, like a method in a class, and test it. Unit testing is the smallest kind of testing one can do. I routinely find poor design choices in my classes using unit tests because if it is hard to write a test, it is hard to use in real situations. The second is it can help determine whether or not the code makes sense before we use the code in many different places. Unit testing is useful for a few different things. Each type of test is essential for different reasons, and the idea is as you move from one to the other, you cover multiple facets of an application from various angles. Some of these may have further specializations, like behavioral testing generally borne out of a need for functional testing. Functional Testing: Testing more substantial portions of related systems at once.Integration Testing: Testing code to make sure it works as expected with other units.Unit Tests: Testing code in isolation of the rest of the codebase.
PHPUNIT MOCKS VS STUBS HOW TO
There are a few different accepted ways of how to write and run tests, each with their purposes and reasons for how they work. The only way to make sure the code continues to work and does not break is to make sure it is easily testable. Remember when “past me” tried to be clever and reduce that set of nested ifs into switch() and ternary statements? That might have worked, but it is not clear.Īfter clean code, the next phase is testing. The harder it is to decipher the intention of code, the more difficult it is to maintain. The first line of defense against decaying code is to write simple, clean code.
No, it’s just that code decays quicker than we think. There is a persistent joke that “Past me was a horrible developer!” We are not bad developers. Why? Once it’s written, code becomes something the unfortunate souls that come after us have to maintain. I was recently talking with some colleagues, and I mentioned code becomes legacy the second we write it. The reason for this is, ultimately, new code becomes legacy code. I have covered topics like dependency injection over the last few months, and before that, I talked about several concepts like DRY, SOLID, and why I feel strongly-typed code is a good idea.
Over the last year, one thread I have tried to keep is the idea of writing clean, simple code. You can get each monthly issue in digital and print options or buy individual issues. If you'd like more articles like this one, become a subscriber today!.
PHPUNIT MOCKS VS STUBS PDF
Download the Free Article PDF to see how it looks in the published magazine. This article was published in the January 2020 issue of php magazine.
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