Supported coverage types: class , method , line , basic block. EMMA can detect when a single source code line is covered only partially. All report types support drill-down, to a user-controlled detail depth. The HTML report supports source code linking. EMMA does not require access to the source code and degrades gracefully with decreasing amount of debug information available in the input classes.
EMMA can instrument individial. Efficient coverage subset filtering is possible, too. Memory overhead is a few hundred bytes per Java class. Giving EMMA a try is ridiculously easy. You can see how the sample coverage reports were created or follow the super-easy "Quick Start" steps. See Section6. Now the instrumented application can be run. In a real-world project you might be packaging the instrumented classes in an archive to be deployed in an application server, but in this tutorial we just load the classes from disk:.
Don't forget the classpath Notice an important detail: the instrumented classes must appear first in the classpath. Also, instr does not copy non-executable items like interfaces and resource bundles, so you need to have the original out behind outinstr for everything to work.
And finally, we combine the class metadata and runtime coverage profile to produce a plain text and an HTML reports:. Note that there could be several instrumentation and execution stages and report will happily merge all of the results in memory before generating the reports. To merge all files on disk for maintenance and disk storage reasons you can use merge :.
In EMMA's offline mode, you are in complete control of mixing and matching metadata and coverage data from different application runs. You can instruct all tools to merge all types of data in the same file or keep everything in separate file repositories. This has been a quick intro to EMMA's offline instrumentation tools for command line. Additionally, the ANT build. Although it would have been possible to keep everything in a single file, using distinct files allows for more clarity.
This tutorial assumes that you have an EMMA distribution directory that contains both emma. The easiest way to accomplish this is with the following definitions in your build. Add this after EMMA task definitions:. Now, whenever you insert emma before any run targets on ANT's command line, you enable on-the-fly coverage instrumentation and reporting but ANT commands without emma continue to function as before :. These extensions only take effect when the task is in enabled state and have no impact on the build otherwise.
If your intent is to base coverage metrics on the full set of classes in the classpath, you can set fullmetadata task attribute to true. Although this was not the case with this tutorial's sample code, chances are your application has third-party library dependencies and you are not interested in their coverage metrics.
If these techniques are not sufficient e. Offline instrumentation does not keep everything in memory and ultimately gives you much more control over what gets instrumented. To summarize, an existing build. Futher reading. This design allows for a simple form of build flow control, whereby entire sequences of EMMA commands can be disabled at a single point. Let's go back to the starting point of the previous section and assume that you have a build.
In a real world project the actual application could be either an end user application or your test framework driver. Adding offline coverage instrumentation and reporting to this build is not much harder than it was in the command line tools case, in Section 2. When EMMA instrumentation is enabled via emma. It is important that this property exist only when emma. Class metadata is dumped into a metadata. In version 2. As in the command line case, the instrumented classes need to be first in the classpath.
Each time you run, do you want to accumulate coverage data or discard previous results? As a result, the coverage. The collected source paths of the java files are used to generate the final HTML report. Icon All coverage. Option Description Include Source Files in the Coverage Data Check this option to include source files into the code coverage report you'll be able to see sources on the Web. Warning Icon Enabling this option can increase the report size and may slow down the creation of your builds.
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