There’s a reason for the challenge. The Symfony project offers a tutorial modeled after the advent calendar: 1 exercise per day for 24 days ( This example also shows one handy symfony link helper: link_to_unless() will output a regular link_to() if the test given as the first argument is. A lot of developers learned symfony thanks to askeet, and many companies still use askeet as their main training material. But the askeet tutorial started to show.
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The questions are now askset organized in the askeet website, thanks to the community tagging feature that we added yesterday. But there is a thing that has not been described until now, despite its importance in the life of web applications. Unit tests are one of the greatest advances in programming since object orientation.
They allow for a safe development process, refactoring without fear, and can sometimes replace documentation since they illustrate quite tutorizl what an application is supposed to do. Symfony supports and recommends unit testing, and provides tools for that. The overview of these tools – and the addition of a few unit tests to askeet – will take much of our time today. There are many unit test frameworks in the PHP world, mostly based on Junit.
We didn’t develop another one for symfony, but instead we integrated the most mature of them all, Simple Test. It is stable, well documented, and offers tons of features that are of considerable value for all PHP projects, including symfony ones. If you don’t know it already, you are strongly advised to browse their documentationwhich is very clear and progressive.
Simple Test is not bundled hutorial symfony, but very simple to install. Install it via pear by awkeet. If you want askeeet write a batch script that uses the Simple Test library, all you have to do is insert these few lines of code on top of the script:. Due to non backward-compatible changes in PHP 5.
Qskeet should change shortly an alpha version addressing this problem is availablebut unfortunately the rest of this tutorial will probably not work if you tuutorial a later version. The setUp method is run just before each test method, and tearDown is run just after each test method. The actual test methods start with the word ‘test’.
To check if a piece of code is behaving as you expect, you use an assertion, which is a method call that verifies that something is true. In Simple Test, assertions start by assert.
In this example, one unit test is implemented, and tutorkal looks for the word ‘user’ in the default page of the module. This autogenerated file is a stub for you to start. So for now, we will erase these files and tutroial on our own test cases. During day 13we created a Tag. We will add a few unit tests for our Tag library. The first test case that we will implement concerns the Tag:: Unit tests are supposed to test one case at a time, tutoorial we decompose the expected result of the text method into elementary cases.
We know that the Tag:: This is the heart of a unit test. If it fails, the name of the test case will be output when the test suite is run. If it passes, it will simply add to the number of passed tests.
We could add a last test with the word ‘ FOo-bar ‘but it mixes elementary cases. If this test fails, you won’t have a clear idea of the precise cause of the problem, and you will need to investigate further. Keeping to elementary cases gives you the insurance that the error will be located easily.
The extensive list of the assert methods can be found in the Simple Test documentation. The symfony command line allows you to run all the tests at once with a single command remember to call it tutoial your project root directory:.
These tests will pass and the command line will show:. The greatest benefit of unit tests is experienced when doing test-driven development. In this askeft, the tests are written before the function is written. With the example above, you would write an empty Tag:: The test would fail. You would then add the necessary code to transform the argument into lowercase and return it in the Tag:: The test would pass this time. So you tutkrial add the tests for blanks, run them, see that they fail, add the code to remove the blanks, run the tests again, see that they pass.
Then do the same for the special characters. Writing tests first tutofial you to focus on the things that a function should do before tutorizl developing it. It’s a good practice that others methodologies, like eXtreme Programmingrecommend as well. Plus it takes into account the undeniable fact that if you don’t write unit tests first, you never write them.
An application built with a test driven methodology ends up with roughly as much test code as actual code, so you don’t want to spend time debugging your tests cases We will now add the tests to check the second method of the Tag object, which splits a string made of several askert into an array of tags. Add the following method to the TagTest class:.
As a good practice, we recommend to name the test asoeet out of the class they are supposed to test, and the test cases out of the methods they are supposed to test. To find which one it is, you will need gutorial remove them one at at time to see when the test passes.
This time, it’s the last one, when we test the handling of simple quotes. As part of your homework, you will have to correct it for tomorrow. This illustrates the fact that if you pile up too much elementary test cases in an array, a failure is harder to locate. Always prefer to split long test cases into methods, since Simple Test mentions the name of the method where a test failed. Web applications are not all about objects that behave more or less like functions.
The complex mechanisms of page request, HTML result and browser interactions require more than what’s been exposed before to build a complete set of unit tests for a symfony web app. We will examine three different ways to implement a simple web app test. The test has to do a request to the first question detail, and assume that some text of the answer is present.
We will put this test into a QuestionTest. Symfony provides an object called sfTestBrowserwhich allows to simulate browsing without a browser and, more important, without a web server.
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Being inside the framework allows this object to bypass completely the http transport layer. This means that the browsing simulated by the sfTestBrowser is fast, and independent of the server configuration, since it does not use it.
The sfTestBrowser simulates a cookie. This means that with a single sfTestBrowser object, you can require several pages one after the other, and they will be considered as part of a single session by the framework.
Now, every new test method that you add will have a clean sfTestBrowser object to start with. You may recognize here the auto-generated test cases mentioned at the beginning of this tutorial.
Simple Test ships with a WebTestCase class, which includes facilities for navigation, content and cookie checks, and form handling. Tests extending this class allow you to simulate a browsing session with a http transport layer. Once again, the Simple Test asleet explains in detail how to use this class. The asket built with WebTestCase are slower than the ones built with sfTestBrowsersince the web server is in the middle of every request.
They also require that you have a working web server configuration. Using these methods, you can simulate a complex browsing session. Here is a subset of the WebTestCase navigation methods:. We could easily do the same test case as previously with a WebTestCase.
Askeet tutorial updated to 0.6
Beware that you now need to tjtorial full URIs, since they will be requested to the web server:. The additional methods of this object could help us test how a submitted form is handled, for instance to unit test the login process:.
It is very handy to be able to set a value for fields and submit the form as you would do by hand. For asskeet information about form test with Simple Test, read the related chapter of the Simple Test documentation.
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For very complex interactions, like with AJAX interactions for instance, you need asket be able to reproduce exactly the mouse and keyboard inputs that a user would do. Usually, these tests are reproduced by hand, but they are qskeet time consuming and prone to error.
Good Challenge: Symfony Askeet Tutorial | Christian Roy
For instance, to do the simple unit test askewt question detail, create the following file called testQuestion. A test-case is represented by an HTML document, containing a table with 3 columns: Not all commands take a value, however. You also need to add this test to the global test suite by inserting a new line in the table of the TestSuite.
Akseet ‘Main Test Suite’, than click on the button to run all tests, and watch your browser as it reproduces the steps that you have askete him to do. As Selenium tests run in a real browser, they also allow you to test browser inconsistencies.
Build your test with one browser, and test them on all the others on which your site is supposed to work with a single request. But thanks to the Firefox Selenium extension, all it takes to create a test is to execute the test once in a recorded session. While navigating in a recording session, you can add assert-type tests by right clicking in the browser window and selecting the appropriate check under the Append Adkeet Command in the pop-up menu.
The user ‘fabpot’ logs in, displays the second page of questions to access the asket one he’s not interested in so far, then clicks the ‘interested? It was all recorded with the Firefox extension, and it took less than 30 seconds:. We had to manually add a pause action after the click on the AJAX link, since Selenium wouldn’t go ahead of the test otherwise.