Explain about coverage and different types of coverage techniques ?

 Posted by Bharathi Cherukuri on 7/13/2012 | Category: QA (Testing) Interview questions | Views: 6593 | Points: 40

Coverage is simply a measurement which gives the information about, how much the test case has been exercised.
The different types of coverage techniques are discussed below:

1) Statement coverage: The main advantage of this statement coverage is to identify which blocks of code has been executed in a method or a class.

2) Decision coverage: This is also known as Branch coverage. There will be two outcomes(True/False) for any of the statements like IF/DO-WHILE/CASE. This technique will ensure the outcome should be executed atleast once.

The formula to calculate decision coverage is:

Decision Coverage=(Number of decision outcomes executed/Total number of decision outcomes)*100%

3) Path coverage: In this technique, the test case is executed atleast once in such a way that every path is executed atleast once including all loop paths taken zero, once, and multipe.

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