CHAPTER 11 ACCEPTANCE TESTING
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When Selenium executes the View Forum test case, it will perform the following actions in the browser: Open the /forum URL. Verify that the title of the page is Forum. Verify that the text Forum can be found somewhere on the page. Verify that the page contains the text There are no posts. Note that this requires that the test database is empty. You can empty the table manually or have the script do it, as we ll show you in the next sections. Selenium tests are stored in the test/selenium directory. It is good practice to group related tests into test suites, which is why we put the forum acceptance tests in a folder called forum. Selenium on Rails creates test suites automatically by scanning the test/selenium directory for subdirectories and acceptance tests. Acceptance tests are sorted by their filenames, which are run sequentially. In our case, the test suite will be created from the test/selenium/forum folder.
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Tip If you need the tests to run in a specific order, prepend their filenames with a number. For example, a test suite containing a login and logout test could have files named 01_login.sel and 10_logout.sel, so that the login test runs before the logout test. The same naming scheme can be used with test suite directories.
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By default, Selenium scripts are enabled only for the test environment. This means you need to start WEBrick in test mode by executing the following command: $ script/server -e test Before running the test, make sure your test database has been updated to the latest version. This can be done with the rake command: $ rake db:test:clone_structure You can now execute the test we just created by issuing the following command: $ rake test:acceptance This will open all the browsers that you specified in the Selenium on Rails configuration file, one by one, and execute the View Forum test case in your browser. After the tests have run, you should see the test result page, as shown in Figure 11-1.
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CHAPTER 11 ACCEPTANCE TESTING
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Figure 11-1. The Selenium TestRunner after a successful test run Successfully executed commands are shown in green. Failures are in red. The table at the bottom of the page shows detailed statistics of the test.
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Writing acceptance tests requires detailed knowledge of how Selenium works (and a lot of typing). The good news is that Selenium IDE simplifies acceptance test creation. Selenium IDE is an integrated development environment that has been implemented as an extension available for Mozilla Firefox only.
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Using the Selenium IDE
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Selenium IDE allows you to record your tests directly in the browser. You simply click the record button and perform the actions in your browser. Selenium IDE also allows you to run and debug tests. These features are all made possible by the inclusion of Selenium Core in the extension. On top of this, Selenium IDE provides you with features like autocompleting commands and saving recorded tests as HTML, Ruby, or other any other user-defined format.
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CHAPTER 11 ACCEPTANCE TESTING
The Selenium IDE project is hosted, like Selenium itself, at www.openqa.com. Install Selenium IDE by going to http://www.openqa.org/selenium-ide/ and accessing the Selenium IDE Downloads page, as shown in Figure 11-2.
Figure 11-2. The Selenium IDE Downloads page Firefox requires that you allow www.openqa.org to install extensions on your machine. So, your first step is to click the Edit Options button at the top left of the Selenium IDE Downloads page (see Figure 11-2) and add www.openqa.org to the list of privileged sites. Next, click the Download link again. This time, you should see the dialog box shown in Figure 11-3. To continue with the installation, click the Install button. After restarting Firefox, you can open Selenium IDE by selecting Tools Selenium IDE from the browser menu bar. You should now see the Selenium IDE window, as shown in Figure 11-4.