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Figure 133 A statement coverage run shows that our tests actually
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missed trying out two parts of the code, the empty KeyValueMap() constructor and the first put() call in the initializeWithString() method
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EclEmma noted that not all the KeyValueMap code had been tested, and the result is correct: We missed trying out the basic parameter-less constructor, and we also didn t try initializing an object with a string such as curly&larry&moe&stooges=3, which would store empty values for the first three keys We can fix this by adding a few more tests, such as the following
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@Test public void testKeyValueMapNoParameters() { final KeyValueMap kvm = new KeyValueMap(); assertTrue(kvmisEmpty()); }
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13 Testing Your GWT Application
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@Test public void testKeyValueMapNoValues() { final KeyValueMap kvm = new KeyValueMap("curly&larry&moe&stooges=3"); assertEquals(4, kvmsize()); assertTrue(kvmcontainsKey("curly")); assertTrue(kvmcontainsKey("larry")); assertTrue(kvmcontainsKey("moe")); assertTrue(kvmcontainsKey("larry")); assertEquals("", kvmget("curly")); assertEquals("", kvmget("larry")); assertEquals("", kvmget("moe")); assertEquals("3", kvmget("stooges")); }
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Rerunning the coverage test now produces a round 100% score for our class, so we can be more satisfied about our testing However, note that while low coverage values do point to inadequate testing, high coverage values do not guarantee the absence of errors and are probably not cost-effective (For example, trying to produce all possible runtime exceptions can be a hard job, and direct code examination may prove to be better) Usually, values around 80% to 90% are expected, but you shouldn t go overboard with this; when tests start getting complicated, try to focus more on coding more clearly and finding bugs than on achieving higher coverage values16 What we have seen up to now is standard fare for JUnit programmers, and it s easy to see how it would apply to server-side code, or to such methods as previously shown, which do not deal with users, input fields, graphic objects, and the like How would we apply JUnit to such code Let s turn to MVP code, which is far more interesting
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It might not be obvious at the beginning, but there are many reasons why you couldn t directly test GWT form code with JUnit First, JUnit depends on reflection, and GWT compiled code doesn t provide it, so that s a showstopper If your code runs JavaScript (maybe through JSNI, as in 8, Mixing in JavaScript, or by using some DOM or History methods, as in 4) then JUnit won t be able to deal with it; it can work only with stand-alone Java code, which cannot run JavaScript Using any DOMrelated methods is also a no-no; JUnit doesn t have access to a browser, so that code couldn t even be executed Finally, using GWTCreate() also won t work, leaving out
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16 See wwwbullseyecom/minimumhtml for a good study on this and for actual requirements for several industries
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RPC and many other GWT features17 So, how do you get to test any forms with JUnit We already saw the answer in 5, Programming the User Interface ; MVP lets you separate concerns by testing the important Presenter code (based on pure Java) and leaving for later the mostly trivial View code
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You can get around all the preceding limitations if your code is 100% functional, with no side effects, and deals with the rest of the system only through its input parameters We are going to use a well-known technique and use mock objects to simulate and verify all the interactions between the tested object and the rest of the system Going back to an already mentioned example, how would you test a method that shows a Windowalert() message, in a fully automatic way, with no other tools but Java A method that produces such an alert is breaking the stated rule given: It is accessing and using something (namely, Window static methods) that it didn t receive as a parameter Another example: How would you test code that sends tweets, or that makes online payments These two examples are even worse; whenever you tested your program, it would start annoying people everywhere with test tweets, or freely making orders and spending your money! If, however, your object under test had received an object, itself with a method that could simulate (but not actually do) the desired behavior, then your code would be testable (The object under test would use the received object, and the latter could afterward let us know whether it was called, with which parameters, in what order, and so) The received object would probably not do any kind of real work (thus, it s actually a mock object) but rather keep score so we can later see what happened Of course, writing many of these mock objects would be quite a chore Moreover, if we need to run several different tests on the same object, then we would probably need several sets of the same mock objects; that much programming would more likely make you do without testing! There are several kinds of objects used in testing other than mocks, according to the usual Software Engineering literature; let s briefly consider some of those, in growing scale of complexity18
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17 This isn t actually 100% true; there are some cases that can be tested despite what was asserted in the text If your code can be tested even with a null object (that is, receiving null instead of an actual object) you can surround a GWTcreate() call with GWTMockUtilitiesdisarm() and GWTMockUtilitiesrestore() calls, and no object will be created Of course, you won t be able to run all kind of tests if the object is null, but for some restricted tests it could be a good aid 18 Sometimes, all these objects are generically called test doubles, for they replace real objects in the same way as a stunt double replaces an actor for some scenes in a movie
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