What is Code Coverage ?

 Code coverage is a measure of the percentage of code that has been executed during automated testing. It is a metric used to assess the effectiveness of testing by measuring how much of the code has been exercised by the tests.

Code coverage is typically measured as a percentage of lines of code or functions that have been executed during testing. For example, if a piece of code has 100 lines, and the test suite executes 80 of those lines, then the code coverage would be 80%.

Code coverage is an important metric for ensuring that software is thoroughly tested and that all parts of the code have been exercised. However, it is important to note that high code coverage does not necessarily guarantee the absence of bugs or defects in the software. It is possible to achieve high code coverage without testing all possible scenarios or edge cases.

There are several types of code coverage, including statement coverage, branch coverage, and path coverage. Statement coverage measures the percentage of statements in the code that have been executed, while branch coverage measures the percentage of possible execution paths that have been tested. Path coverage measures the percentage of possible paths through the code that have been tested.

Overall, code coverage is an important metric for measuring the effectiveness of testing and ensuring the quality of software. However, it should be used in conjunction with other testing metrics and techniques to ensure that software is thoroughly tested and free of defects.