How Can I Aggregate Go Package Coverage Results?

Aggregate Go Package Coverage

When executing tests in your Go library, you might encounter a need to obtain a consolidated coverage overview for all its packages. By default, the '-cover' flag only provides coverage information for each package individually.

Solution

Since Go 1.10, you can utilize the '-coverpkg' flag to address this issue. Simply run the following command:

go test -v -coverpkg=./... -coverprofile=profile.cov ./...

After running your tests, generate the aggregated coverage analysis using:

go tool cover -func profile.cov

Legacy Method (Pre-Go 1.10)

For Go versions prior to 1.10, you can employ the following bash script:

#!/bin/bash

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

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