How do you determine the level of decision coverage you have achieved for a module of code?

The determination of decision coverage is focused on assessing how many of the possible outcomes of decisions within the code have been tested. Decision coverage measures whether each decision point in the code has been executed, specifically looking at all possible outcomes (true and false) that can occur from those decisions.

When you take the number of decision outcomes that have been tested and divide it by the total number of decision outcomes in the module, you are essentially calculating the percentage of decision outcomes that have been verified through testing. This gives a clear indication of whether all logical paths through the decision points have been executed in tests, which is crucial for ensuring software quality and reliability.

This method of measuring decision coverage helps in identifying any untested paths that could potentially lead to defects if certain outcomes are not exercised during testing. By focusing on decision outcomes, you can ensure that the testing is thorough and that the code behaves correctly under all conditions dictated by its decision-making logic.