Support for build tags

[JelteF]

Just wanted to say great tool. It merges the reports much better than the bash stuff we had before. Is it possible to add a -tags option to the command though? I use a test tag to exclude some files that don't need to be tested or covered from the tests.

[vmarkovtsev]

A very useful feature for me too.

[JelteF]

With go1.10 this tool is not needed anymore.

[dimroc]

With how we've structured our tests, we still have need for this tool, and would love to see the -tags option merged from #18.

Our test setup:

• packageA is tested from packageA_test
• We have multiple packages and want coverage from packageB_test to count even if it inadvertently uses packageA.

In go1.10, if coverage is achieved from a different package, it's not counted, unless you use -coverpkg=./.... But you then have duplicate samples in your coverage.out that leads to erroneous coverage percentages from tools:

We've tried more elaborate things like using go list -f ... alongside -coverpkg but prefer goverage. If anyone has feedback on this, it would be much appreciated.