Junit best practice

• Don’t aim at unit testing each method in the SUT. Unit test only the publicly available API.
• When writing unit tests, mimic the behavior of the SUT’s clients.
• Don’t test private methods. Either unit test them indirectly, using the public API, or extract them into separate classes and test those classes instead.
• Don’t hesitate to unit test internal classes as long as you follow the guidelines above
• Test data should  kept and read from a file instead of string variable

https://enterprisecraftsmanship.com/2017/10/23/unit-testing-private-methods/

• JUnit antipatterns
• unit-testing-anti-patterns-catalogue

Unit Test Naving Conventions: 

• 7-popular-unit-test-naming

Java code coverage tool for eclipse

Overview : 

In computer science, code coverage is a measure used to describe the degree to which the source code of a program is tested by a particular test suite. A program with high code coverage has been more thoroughly tested and has a lower chance of containing software bugs than a program with low code coverage.

In this article we will see how we can generate code coverage report using tools in eclipse . There are number of tools for eclipse that we can use to generate code coverage report :


EclEmma : 

EclEmma is a free Java code coverage tool for Eclipse, available under the Eclipse Public License. It brings code coverage analysis directly into the Eclipse workbench:

• Fast develop/test cycle: Launches from within the workbench like JUnit test runs can directly be analyzed for code coverage.
• Rich coverage analysis: Coverage results are immediately summarized and highlighted in the Java source code editors.
• Non-invasive: EclEmma does not require modifying your projects or performing any other setup.

How to install  EclEmma : 

There are number of ways we can install EclEmma to eclipse but in this article we will see how to install EclEmma using update site.  The steps are very easy :

use the following update site url in the ellipse install dialog

 http://update.eclemma.org/  and follow the instruction 

Help >> Install New Software 

After successfully installing the EclEmma eclipse plugin ; now it is time to see the coverage report:

Right client on project and click Coverage As > JUnit Test

Running the above command execute all the JUnit test cases and generate Code Coverage report in the coverage view: 

if you cannot see the find it from Window >> Show View >> Other..

Export the Report to local disk :

You can export the coverage report for later use: 

Click the index.html  from the exported files, your will see a coverage report like blow :

Now you can dig down you report!