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How to Generate Code Coverage Reports for Golang Applications

This document covers how to generate HTML Code Coverage Reports for Golang Applications.
Generate and run a test executable which calls your main()

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go test -c -covermode=count -coverpkg ./...
./sms.test -test.run "^TestMain$" -test.coverprofile=coverage.cov


Run your Unit tests for their coverage

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go test -test.covermode=count -test.coverprofile=unit.out ./...


Merge coverage Reports

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go get github.com/wadey/gocovmerge
gocovmerge unit.out coverage.cov > all.out


Generate Reports

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# HTML Report File
go tool cover -html all.out -o coverage.html
 
# Function Coverage Report
go tool cover -func all.out

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