EclEmma - A Structural Code Coverage Tool

Code coverage analysis is a structural testing technique (AKA glass box testing and white box testing), which tests a program’s behavior against the intention of the examines how the program works (source code), taking into account possible pitfalls in the structure and logic. Code coverage analysis is the process of finding areas of a program not exercised by a set of test cases, creating additional test cases to increase coverage, and determining a quantitative measure of code coverage, which is an indirect measure of quality.

EclEmma is a free Java code coverage tool for Eclipse, available under the Eclipse Public License. It’s an Eclipse plug-in that generates code coverage reports and provide simple trace information about test cases. It launches from within the workbench like JUnit test runs can directly be analyzed for code coverage.

For small programs, coverage is relatively easy to calculate by hand; however, for larger programs, the task is much more difficult. Coverage tools, like EclEmma, help by automating the coverage process and providing readable reports.

Download and Configuration Details

Official site in this link (http://www.eclemma.org/)
Following steps are for installing and configuring EclEmma on Eclipse IDE.
 - Open Eclipse (any version of Eclipse)
 - Go to Help -> Eclipse Marketplace
 - Search “EclEmma” and click install on the result

Usage of Tool

EclEmma may be used on top of JUnit. EclEmma runs the JUnit test cases and generates the coverage report from the execution. EclEmma provides overall, package, and file level information on statement.

Create a project containing a package, a class and a method for (basic) demonstration. Create a JUnit class for testing the aforementioned method, the test unit should contain methods (@Test) to execute the unit. Then run the project by selecting “Coverage As” and choose “JUnit Test”. Observe the report generated, from the “JUnit” and the “Coverage” tabs.

Gives a very brief output on the console, yet allows for multiple export formats for much more comprehensive viewing of the analysis of the code base.

Coverage details from the Console in Eclipse IDE:


Coverage details:

Coverage details exported as HTML report:

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