Cobertura Setup in MultiModule Maven With Jenkins (Draft)

Why we need a code coverage analysis for functional testing?

Reason is simple, tests which are generated out of a requirement specification just tests the functionality and satisfy when it meets the acceptance criteria. But when you see the overall tests which are resulted for the application, you can see lot of dependencies which are never tested at all.

Coverage analysis gives you a very solid statistics saying that these are the tests performed in the system and these are the statements or branches which are executed and these are not at all touched. This will help in tremendously improving the overall testcases which are written for the whole system by covering the untouched by analyzing the coverage report.

 

Out of Scope		Scope		Things Used
Eclipse Project Creation		Maven configurations		Sample Project
Maven Initial Setup		Instrumenting Code		Cobertura
JUnit Selenium Tests		Jenkins configurations		Maven
Cobertura Competencies				JUnit
				Jenkins

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STEP 1 : Create a simple multi-module maven web project to try it or use the one which you want to report coverage

Fig 1

• Take a help from the maven example here to create a multi-module maven web project

• Considered Fig 1 as a simple structure of such multi-module web project

• Cobertura module - specifically added to generate the coverage report

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STEP 2 : Modify the pom files to do the instrumentation of the codes

 do-instrumentation
 
  
   
    org.codehaus.mojo
    cobertura-maven-plugin
    ${cobertura.plugin.version}
    
    
    
     
      instrument-code
      process-classes
      
       instrument
      
      
       true
      
     
    
   
  
 
 
  
   net.sourceforge.cobertura
   cobertura-runtime
   ${cobertura.version}
   provided
   pom
  
 

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STEP 3 : Include the necessary dependencies

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STEP 4 : Have a separate module for merging & generating the report out of cobertura ser files

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STEP 5 : Build the whole project to get the instrumented jars & war

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STEP 6 : Deploy the war and run whatever tests you want to run on the application

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STEP 7 : Run the Cobertura sub module with the location of ser file and generate the reports

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STEP 8 : Give all the above tasks from 4 - 6 to Jenkins

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