Testing in Java

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Testing
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Now that the Favorites view has been modified, the JUnit tests for the Favorites view need to be updated to take the modifications into account If the tests are run as they stand, you ll get the following failure
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CHAPTER 7
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testView(comqualityeclipsefavoritestestFavoritesViewTest)
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Views
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javalangAssertionError: array lengths differed, expectedlength=3 actuallength=0 at orgjunitAssertfail(Assertjava:71) at orgjunitAssertinternalArrayEquals(Assertjava:293) at orgjunitAssertassertArrayEquals(Assertjava:129) at orgjunitAssertassertArrayEquals(Assertjava:140) at comqualityeclipsefavoritestest FavoritesViewTesttestView(FavoritesViewTestjava:63) at sunreflectNativeMethodAccessorImplinvoke0(Native Method) at sunreflectNativeMethodAccessorImplinvoke(Unknown Source) etc
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On closer inspection, this test is looking for the default viewer content (see Section 283, Creating a Plug-in test, on page 100) Since this default content has been removed in favor of real content (see Section 724, Content provider, on page 306), the test should be modified as follows:
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public void testView() { TableViewer viewer = testViewgetFavoritesViewer(); Object[] expectedContent = new Object[] { }; Object[] expectedLabels = new String[] { }; code for the rest of the test }
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In a similar fashion, add code to the AddToFavoritesTest (see Section 676, Adding a test for the new action, on page 268) to assert the Favorites view content before and after the test Since this type of assertion is duplicated in several places, it can be extracted into a new assertFavoritesViewContent method and pushed up into the AbstractFavoritesTest class
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Tip: Add orgjunitAssert to the Java > Editor > Content Assist > Favorites preference page so that Ctrl-Space content assist suggestions will include the various JUnit Assert static methods
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Image Caching
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Image is a Java construct that wraps a native resource and thus must be
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properly managed As with all other native wrappers in Eclipse, the rule is that if you create it, you must dispose of it to prevent memory leaks ImageDescriptor, on the other hand, is a pure Java type that identifies a particular image without its associated native resource It does not need to be
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77 Image Caching
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managed and removed properly; rather, it will be automatically managed and disposed of by the Java garbage collector When a plug-in creates an instance of Image, it typically caches it in an object that maps the identifier for the image typically an ImageDescriptor to a particular image Not only does the cache provide a way to remember which Image instances were created and thus need to be cleaned up, but it also keeps the same image from being loaded into memory more than once, preventing unnecessary usage of limited OS resources Depending on where and when the image is used, the image cache may be disposed when the view closes, or it may be kept around for the life of the plug-in In the Favorites plug-in, if you need to load your own images (see Section 723, View model, on page 295), instantiate a class similar to the one below to cache loaded images This class follows the Eclipse approach by lazily loading the images as they are requested rather than loading all images immediately when the plug-in starts or when the view is first opened The plug-in s stop() method would be modified to call the dispose() method of this instance so that the images would be cleaned up when the plug-in is shut down
public class ImageCache { private final Map<ImageDescriptor, Image> imageMap = new HashMap<ImageDescriptor, Image>(); public Image getImage(ImageDescriptor imageDescriptor) { if (imageDescriptor == null) return null; Image image = (Image) imageMapget(imageDescriptor); if (image == null) { image = imageDescriptorcreateImage(); imageMapput(imageDescriptor, image); } return image; } public void dispose() { Iterator<Image> iter = imageMapvalues()iterator(); while (iterhasNext()) iternext()dispose(); imageMapclear(); } }
Alternatively, you can use the class orgeclipsejfaceresource ImageRegistry or the PlugingetImageRegistry() method
Tip: WindowBuilder Pro (see Appendix A, Eclipse Plug-ins and Resources) provides a ResourceManager that caches images, fonts, cursors, and so on
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CHAPTER 7
Views
Auto-sizing Table Columns
Another nice enhancement to the Favorites view is for the columns in the table to be automatically resized to fit the current space Eclipse provides TableColumnLayout for auto-sized tables and TreeColumnLayout for auto-sized trees Replace the Favorites view table layout by modifying createTableViewer() as shown below
TableColumnLayout layout = new TableColumnLayout(); parentsetLayout(layout); typeColumn = new TableColumn(table, SWTLEFT); typeColumnsetText(""); layoutsetColumnData(typeColumn, new ColumnPixelData(18)); nameColumn = new TableColumn(table, SWTLEFT); nameColumnsetText("Name"); layoutsetColumnData(nameColumn, new ColumnWeightData(4)); locationColumn = new TableColumn(table, SWTLEFT); locationColumnsetText("Location"); layoutsetColumnData(locationColumn, new ColumnWeightData(9));