Software Quality Assurance Practice Exam

Which logic coverage test will test all possible combinations of condition outcomes in each decision?

1. Decision coverage

2. Condition coverage

3. Statement coverage

4. Multiple-condition coverage

The correct answer is: Multiple-condition coverage

Multiple-condition coverage is the testing technique that ensures all possible combinations of condition outcomes within a decision point are evaluated. This means that not only are individual conditions within a decision tested, but all possible pairs and groups of conditions are also tested to ensure that each possible outcome affects the result appropriately. This type of coverage is particularly important in complex decision-making scenarios where the interplay between multiple conditions can lead to different outcomes depending on their combinations. For example, consider a decision that involves two boolean conditions. Multiple-condition coverage would require that all four combinations of true and false outcomes for these conditions are tested, providing a comprehensive assessment of how the decision behaves across all scenarios. This thoroughness helps in identifying potential issues in logic that might not be apparent when looking at conditions or decisions in isolation. Other types of coverage, like decision coverage or condition coverage, do not test all combinations of outcomes. Decision coverage ensures that each decision evaluates to both true and false but does not consider the combinations of outcomes of individual conditions. Condition coverage focuses on testing each individual condition for both outcomes but again does not consider how combinations affect the overall decision. Statement coverage merely tracks which lines of code have been executed, providing even less granularity in testing logical combinations.