Requirement Based System Test Case Prioritization of New and Regression Test Cases

In this chapter a new prioritization technique has been proposed with two new prioritization factors for regression testing and with computed weights to the proposed six factors. This proposed technique prioritizes the test cases based on their weights. The procedure for computing the weights of the test cases is three fold. Firstly, to calculate the weights of the proposed factors, the factors that influence the requirements are identified. The post mortem analysis carried out (explained in section 3.3) to identify the proposed factors, reveals that the factors Usability and Application Flow have higher influence on regression test cases than Completeness and Traceability. Subsequently, the impacts of these factors on the requirements are quantified by assigning values in a ten point scale. With these factor values, factor weights are computed proportional to the mean value of each factor for all the project requirements. Intuitively, factors which have higher weights tend to be more important for the proposed test case prioritization technique. Secondly, to compute the weight of the requirements, the factor values and the factor weights are used. Finally, the test cases are mapped towards corresponding requirements, by establishing a knowledge based mapping between them. The proposed prioritization technique has been validated and experiments have been conducted to study the effectiveness of the proposed prioritization technique on two industrial case studies and on two industrial