CODEWITHSUNDEEP
go
hmoragrega
hmoragrega

Reputation: 222

Merge test coverage from multiple go modules

We have a git repository that has two go modules because we want to import only the submodule in other projects

Example:

go.mod
go.sum
cmd/api
  main.go
internal/foo
  foo.go
internal/bar
  bar.go
pkg/middleware
  go.mod        <- another module
  go.sum
  middleware.go

For both modules, we can calculate the coverage correctly but have no way to merge both reports, which we would like to have calculated in CI.

We've tried the approach that we use to merge code from different suites (unit, integration, e2e)

echo 'mode: atomic' > coverage.cov
tail -q -n +2 coverage.*.suite >> coverage.cov
go tool cover -html=coverage.cov

After we merge all the files, coverage.cov contains all the line hits for both modules, but go tool cover only builds the report for the main module, and ignores the submodule lines.

Is there a way to merge the coverage from multiple go modules?

Upvotes: 3

Views: 2702

Answers (1)

Parvesh
Parvesh

Reputation: 176

I came across this question today. I am sharing a work around for this problem.

One way to solve this problem is to use gocov tool

go install github.com/axw/gocov/gocov@latest

go install github.com/AlekSi/gocov-xml@latest

go to the module directory and generate the coverage json using gocov tool

cd pkg/middleware

then generate coverage json file

gocov test ./... > coverage_middleware.json

cd -

generate the coverage json for main module using the gocov

gocov test ./... > coverage_main.json

Now use jq to merge these json and gocov-xml to generate the xml

jq -n '{ Packages: [ inputs.Packages ] | add }' pkg/middleware/coverage_middleware.json coverage_main.json | gocov-xml > coverage.xml

Hope it will help some one. If anyone has better solution, please share.

Upvotes: 3

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