How Can I Achieve Accurate Go Code Coverage When Source and Test Files Are in Separate Folders?

Code Coverage Detection for Separated Folders in Go

When testing your Go code, it's important to ensure adequate code coverage to verify test effectiveness. However, if your project structure separates your source code and test files into distinct folders, you may encounter issues obtaining accurate code coverage information.

In this scenario, where your project structure includes stuff/stuff.go and test/stuff/stuff_test.go belonging to different packages (stuff and test, respectively), the test execution might fail to report coverage for stuff.go.

Solution

To address this issue, you can leverage the -coverpkg flag when executing go test. This flag allows you to specify the packages for which you want to record coverage information. Using this flag, you can ensure that your test execution includes the desired packages and accurately reports the code coverage for your source code.

For instance, to analyze coverage for both the stuff and test packages:

go test -coverpkg=./... ./test/...

Viewing Coverage Report

Once you have executed the tests with the appropriate -coverpkg flag, you can generate a coverage report using go tool cover. This tool will create an HTML report that visualizes the coverage information, allowing you to identify any uncovered lines in your code.

To generate the report:

go tool cover -html=cover.out

By utilizing the -coverpkg flag, you can ensure that your test execution accurately tracks the code coverage of your separated folders, providing valuable insights into the coverage of your application.

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