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CHAPTER 6 I TESTING JAVASCRIPT WITH JSUNIT
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function tearDown() { document.getElementById("value1").value = ""; document.getElementById("value2").value = ""; } </script> </head> <body> <form id="test"> <input type="text" size="3" id="value1"/> <input type="text" size="3" id="value2"/> <input type="button" value="Add" onclick="addNumbers()"/> </form> </body> </html> As you might expect, the results are pretty typical (see Figure 6-6).
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Figure 6-6. Running the setUp()/tearDown() example
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CHAPTER 6 I TESTING JAVASCRIPT WITH JSUNIT
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JsUnit contains another feature that you won t find in JUnit: the setUpPage() function. Some in the JUnit community think its lack of one-time setup and one-time teardown is a flaw in its design. Some have gone so far as to extend JUnit or create new test frameworks that have this feature baked in; in addition, the JUnit frequently asked questions (FAQ) site even describes one way to approximate this behavior.4 Most books about JUnit also discuss approaches to this issue. JsUnit, however, does contain one-time setup; the setUpPage() function is called exactly once per test page and before any of your test functions are called. By now, you ve probably figured out that this is a great place to stash preprocessing, especially if you need to load any data to your page before running the tests. Unlike the setUp() and tearDown() functions, there is a little more to using setUpPage() than just putting your processing in the function. If you do choose to use this feature, make sure you set the setUpPageStatus variable to complete when your function is done this tells JsUnit it can move on and fire the tests on your test page. How about an example Let s return to the simpleJS.js file and add three functions to round out the math features. Include subtract, multiply, and divide functions, as shown in Listing 6-6. Listing 6-6. simpleJS2.js function addTwoNumbers(value1, value2) { return parseInt(value1) + parseInt(value2); } function subtractTwoNumbers(value1, value2) { return parseInt(value1) - parseInt(value2); } function multiplyTwoNumbers(value1, value2) { return parseInt(value1) * parseInt(value2); } function divideTwoNumbers(value1, value2) { return parseInt(value1) / parseInt(value2); } Now use the setUpPage() function to set up some simple test data, as shown in Listing 6-7. Please note the last line of the function you have to tell JsUnit that you re done setting up your page.
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4. junit.sourceforge.net/doc/faq/faq.htm#organize_3
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CHAPTER 6 I TESTING JAVASCRIPT WITH JSUNIT
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Listing 6-7. Using the setUpPage() Function <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>Using setUp and tearDown</title> <script language="JavaScript" src="jsunit/app/jsUnitCore.js"></script> <script language="JavaScript" src="simpleJS2.js"></script> <script language="JavaScript"> var arg1; var arg2; function setUpPage() { arg1 = 2; arg2 = 2; setUpPageStatus = "complete"; } function testAddValidArgs() { assertEquals("2 + 2 should equal 4", 4, addTwoNumbers(arg1, arg2)); } function testSubtractValidArgs() { assertEquals("2 - 2 should equal 0", 0, subtractTwoNumbers(arg1, arg2)); } function testMultiplyValidArgs() { assertEquals("2 * 2 should equal 4", 4, multiplyTwoNumbers(arg1, arg2)); } function testDivideValidArgs() { assertEquals("2 / 2 should equal 1", 1, divideTwoNumbers(arg1, arg2)); } </script> </head> <body> This is an example of using setUpPage. </body> </html> This is starting to get a tad boring yet another green bar (see Figure 6-7).
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CHAPTER 6 I TESTING JAVASCRIPT WITH JSUNIT
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Figure 6-7. Running the setUpPage() test
Test Suites
Once you have a few test pages, you ll want to organize them into test suites, which are just like the similarly named TestSuites from JUnit. Test suites group various test pages, allowing you to run similar tests together by running a single suite. Test suites are nothing more than special test pages that include a list of test pages or other test suites (thereby allowing you to have a master suite) that run in sequence. You can define test suites in a similar fashion to test pages with two exceptions. First, they cannot contain any test functions. Second, your test suite must contain a suite() function that returns a JsUnitTestSuite object. You can use two methods to add items to a test suite: addTestPage(testPage), which adds an individual test page to your suite, and addTestSuite(testSuite), which adds a suite to your, well, suite. Keep in mind that when you add a test page to a test suite, you need to provide a fully qualified or relative pathname to your file in relation to the test runner. In other words, if your jsunit folder is in the same directory as your test pages, then the test runner is one folder deeper than your tests. If you see an error like the one shown in Figure 6-8, make sure you ve provided the path relative to the test runner. When you want to add other test suites to your test suite, keep in mind that the argument to addTestSuite must be of type JsUnitTestSuite, which is declared in the same page as the suite function. Helpfully, you will find a test suite example in the jsunit/ tests directory. Listing 6-8 also shows an example.
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