What does 100% branch coverage imply about a test suite?

Branch coverage is a testing metric that measures the percentage of branches (decision points) in the code that have been executed by a test suite. Achieving 100% branch coverage means that every branch and decision point in the software has been executed at least once during testing. This ensures that all possible paths that could affect the behavior of the application have been tested, which is crucial for identifying potential bugs or issues that may arise from different execution paths.

The implication of 100% branch coverage lies specifically in the thoroughness with which decisions in the code have been tested. It does not necessarily mean that every single line of code has been executed (as that would relate to statement coverage), nor does it confirm the overall completeness of the test cases or the optimization of execution paths. Thus, the focus remains on the coverage of decision outcomes, making the assertion that 100% branch coverage indicates all branches and decisions have been covered the correct interpretation.