Topic: Testing Work

Message


   
Working


	There are many approaches to code coverage measurement. 
	Broadly there are three approaches, which may be used in combination:

 
			 Instrumentation
			
			This approach adds instrumentation statements to 
			the source code and compiles the code with the normal compile tool 
			chain to produce an instrumented assembly.
		
		
			Intermediate code Instrumentation
			
			Here the compiled class files are instrumented by 
			adding new bytecodes and a new instrumented class generated.
		
		
			Runtime Information collection
			
			This approach collects information from the 
			runtime environment as the code executes to determine coverage 
			information
		
	
	Clover uses source code instrumentation, 
	because although it requires developers to perform an instrumented build, 
	source code instrumentation produces the most accurate coverage measurement 
	for the least runtime performance overhead. 
	As the code under test executes, code 
	coverage
	
	
	systems collect information about 
	which statements have been executed. This information is then used as the 
	basis of reports. In addition to these basic mechanisms, coverage approaches 
	vary on what forms of coverage information they collect. There are many 
	forms of coverage beyond basic statement coverage including conditional 
	coverage, method entry and path coverage. 


Edited by raghugn - 30Jun2009 at 2:26am


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