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Task
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Structural
Code Coverage
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Tools /
Software
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JaCoCo, NetBeans, JUnit
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Download
Link
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plugins.netbeans.org/plugin/48750/tikione-jacocoverage
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Prerequisites
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Netbeans
IDE, JUnit libraries, Knowledge of unit testing, OOP and JUnit.
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Description
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TikiOne
JaCoCoverage is a plugin for NetBeans IDE which provides JaCoCo code
coverage.
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Installation
Go to the download link
provided in the above table and download the plugin for your already installed
NetBeans version. Extract the downloaded archive to a folder. Open NetBeans
IDE. From Tools menu select Plugins. From the Plugins window go to Downloaded
tab and add all the 4 .nbm files from the extracted folder and finally click
Install. After accepting license agreements IDE will prompt you to restart.
Select restart. IDE will restart.
What is Structural Code Coverage?
Structural Code
Coverage is a measurement of no. of lines / blocks / segments executed for a
given test case.
JaCoCo
JaCoCo is an open source toolkit for measuring and
reporting for Java Code Coverage.
There are many implementations of JaCoCo (Jenkins JaCoCo, SonarQube JaCoCo
etc.). Some distinct features of
JaCoCo are,
- · Provides line and branch coverage.
- · We can save the output to a file.
- · Supports recent Java versions.
- · Inspects Java byte code.
- · Easy to execute code coverage tests.
- · Supports many popular IDEs and tools (NetBeans, Eclipse, SonarCube, Jenkins etc.)
There are few disadvantages of JaCoCo and structural
code coverage,
- · Code coverage does not reflects effective testing. There are more sophisticated ways for testing in the code level.
- · JaCoCo needs pre written JUnit unit test cases to perform code coverage tests. This is an overhead.
- · Core implementation of JaCoCo has not been updated since long time. There are more modern code coverage tools like CheckMarx used in industrial levels.
Structural Code Coverage Using JaCoCo Plugin for
NetBeans IDE
Create an empty Java
project. Add a simple class and add a method with some if-else conditions. So
we can test branch coverage too. Now create a unit test case for this method
using JUnit. After writing the JUnit class check whether you are getting some
output from the JUnit test case.
Now left click on your
NetBeans project and click Test with
JaCoCoverage. Your source code will be highlighted and test result will be
opened in your web browser as follows.
Green
colored are the code lines which were covered during the test and red colored
lines are the code lines which were not covered. Yellow colored lines are lines
which were partially covered. Refer line no. 17. Only the true part of the
branch has been covered. Yellow colored diamond shows this situation. In line
no. 20, neither of atomic conditional statements are not covered. Red colored
diamond reflects this situation.
In
opened web page you can see a summary of the test. The above gives information
about total no. of lines, conditional statements and their covered percentage. Try
above unit test with different input values to get different results.
Reviews
- · The plugin discussed in this article is a very nice tool to check code coverage in the Eclipse IDE. I did not talk about how to use it in the Eclipse IDE, because it is very intuitive and very easy to use. - Dr. Song Li – The Code Project
- · Idea is pretty simple. Application is started with a code coverage tool is attached to it, any test are executed and results are gathered. - Lyudmil Latinov – Automation Rhapsody
Group
Details
Batch: Software Engineering (2015), Weekend
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IT
15 0172 84
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M.M.M.S. Rupasinghe
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IT
15 0190 28
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L.T. Marasinghe
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IT 15 0331 92
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T.T.C. Phillips
|
|
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