Sonar gives a value of Overall coverage which is a combination of line and branch coverage. I am not sure how important is this metric. What does the value of overall covera
Here's how the overall coverage is computed: https://docs.sonarqube.org/display/SONAR/Metric+Definitions#MetricDefinitions-Tests
If branch coverage is lower than line coverage (and thus lower than overall coverage), it means that your unit tests test the main cases but not really the corner cases.