Path Coverage

Path Coverage is a white-box testing technique used to ensure that all possible execution paths in a program or a module are tested at least once. It is a critical component of structural testing aimed at verifying the internal workings of the code, as opposed to just its external behavior.

Path coverage is expressed as a percentage:

Path Coverage = (Number of executed paths / Total number of possible paths) × 100
Aiming for 100% path coverage means testing every possible path, though this may not always be feasible for complex systems due to the combinatorial explosion of paths.

Use Cases:

• Validating complex algorithms with multiple decision points.
• Ensuring robustness in safety-critical applications, such as aerospace or medical software.
• Detecting defects in systems with high logical complexity.

Advantages:

• Uncovers hidden errors that may not be caught by simpler coverage techniques like statement or branch coverage.
• Provides a thorough assessment of code behavior under all conditions.