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A basic theorem of Computing Theory states that testing can never prove the absence of errors but only their presence Before going any further, let s consider a practical ques5 Martin Fowler s page on Refactoring at wwwrefactoringcom/ is a must-see
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tion: what would you do if a bug surfaces in your code (Yes, even though you may test and test and test, bugs almost surely remain in your code) No matter how tempted you may be, what you won t do is run away to patch your source code: There s a more important problem to fix: namely, that your test code isn t obviously good enough, for it let a bug go past! The first step, after you understand how the error came to be, is to write a new test case that will simulate the situation that led to the error, and thus logically fail Then, and only then, try to fix the code and run the test suite again; your recently added test should now pass, but more important, you now have better tests for the future It is obvious that your original tests missed some conditions; your new ones at least take care of one problem, and that kind of bug won t reappear
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Many Java programmers already use JUnit for testing their code, but what s most interesting is the fact that you can also use it to test GWT code, despite its compilation into JavaScript JUnit6 is a member of the global xUnit family, whose members allow automatic testing for code written in languages as diverse as Smalltalk (SUnit), PHP (PHPUnit), HTTPUnit (web pages and services), and JSUnit (JavaScript) Its current version is 481, and you ll have to get the required jar file, as we mentioned in 2, Getting Started with GWT 2 With earlier versions of GWT, you had to create the appropriate project structure with the jUnitCreator command-line tool, but now the required directories and files are automatically created with the project7 The standard structure has a test directory at the same level as src You can parallel the project structure from src//client into a test//client directory; having the test code and the tested code in the same package will help with visibility matters, but won t hamper creating the application, because by default only code in src/client gets compiled
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So as to get in gear for more complicated testing, let s at first consider how to test the KeyValueMap class we used to store parameters for forms in 4, Working with Browsers (Don t fret if this example doesn t have anything to do directly with forms; we ll presently get to testing such code) As that class is at src/com/fkereki/mvpproject/client/KeyValueMapjava, our test code will reside at test/com/fkereki/ mvpproject/client/KeyValueMapTestjava; note the usual naming convention for our test class For ease of understanding, let s review the original class code
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6 See http://junitorg/ 7 At least, when you use the Eclipse plugin If you use webAppCreator, you ll have to pass the -junit parameter to it
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package comfkerekimvpprojectclient; // imports public class KeyValueMap extends HashMap<String, String> { private static final long serialVersionUID = 5225712868559413562L; public KeyValueMap() { this(""); } public KeyValueMap(final String params) { initializeWithString(params); }
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public final void initializeWithString(final String params) { clear(); if ((params != null) && !paramsisEmpty()) { String[] args = paramssplit("&"); for (String element : args) { int equalIndex = elementindexOf("="); if (equalIndex == -1) { put(element, ""); } else { put(elementsubstring(0, equalIndex), element substring(equalIndex + 1)); } } } } @Override public String toString() { String result = ""; String separator = ""; for (String key : keySet()) { result += separator + key + "=" + get(key); separator = "\n"; } return result; } }
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