Alex

Code Coverage (Video 39)

• We can use the -cover flag for go test to get coverage information from our tests
• Using -coverprofile=c.out -covermode=count we can get an output file that contains coverage information, most importantly a count of how many times specific statements are called
• go tool cover -html=c.out can then be used to analyse the output; it will show your code in a heatmap of how much was covered
• Coverage should be used to guide testing, it shouldn’t be used as a target to hit e.g. 90% or whatever