How to Combine Code Coverage Results from Multiple Go Packages?

How to Consolidate Code Coverage Results for Multiple Packages in Go

When testing multiple packages in a Go library, it can be beneficial to obtain a comprehensive view of code coverage. By default, using the -cover flag with go test provides coverage information for individual packages.

To aggregate coverage data across all packages, you can employ one of two approaches:

Using -coverpkg in Go 1.10 and later:

In Go 1.10 and higher, the -coverpkg flag allows you to specify a comma-separated list of coverage targets. To cover all dependencies of the test package, use:

go test -v -coverpkg=./... -coverprofile=profile.cov ./...
go tool cover -func profile.cov

Using a Bash script in earlier Go versions:

For Go versions prior to 1.10, consider using a Bash script to collect and consolidate coverage data:

#!/bin/bash
set -e

echo 'mode: count' > profile.cov

for dir in $(find . -maxdepth 10 -not -path './.git*' -not -path '*/_*' -type d);
do
if ls $dir/*.go &> /dev/null; then
    go test -short -covermode=count -coverprofile=$dir/profile.tmp $dir
    if [ -f $dir/profile.tmp ]
    then
        cat $dir/profile.tmp | tail -n +2 >> profile.cov
        rm $dir/profile.tmp
    fi
fi
done

go tool cover -func profile.cov

This script iterates through directories with Go files, running tests with coverage enabled and appending the results to a consolidated profile file (profile.cov). You can then use go tool cover to generate a summary of the overall code coverage.

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