How is branch coverage determined?

Question

Options

• ABy taking the number of branches in the code that have been tested and dividing that by the
• BBy taking the number of branches in the code on one path that has been tested and dividing that
• CBy taking the number of statements in the code and dividing those by the number of branches
• DBy counting the number of branches in the code that have been tested

• A
  95% (20)
• B
  5% (1)

Explanation

Branch coverage is calculated by dividing the number of branches actually executed during testing by the total number of branches in the code, then multiplying by 100 to get a percentage - making A correct.

Why the distractors are wrong:

• B is wrong because branch coverage accounts for all branches across the entire codebase, not just those on a single execution path.
• C is wrong because it confuses branch coverage with statement coverage; dividing statements by branches is not a recognized metric.
• D is wrong because simply counting tested branches gives a raw number, not a coverage percentage - you need to divide by the total branch count to get a meaningful coverage metric.

Memory tip: Think of branch coverage like a report card - your grade (coverage %) = what you earned (tested branches) divided by what you could have earned (all branches). Without the denominator, you just have a score with no context.

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