How Can I Include External Package Functions in My Go Coverage Report?

Coverage Excluding External Package Functions

When running coverage on a Go project with multiple packages, it's possible to encounter scenarios where functions defined in external packages are not included in the coverage report. This issue arises when there is a calling relationship between packages, but the coverage report focuses solely on the invoking package.

To address this issue, Go provides the -coverpkg flag. This flag allows users to specify a list of packages to include in the coverage analysis. Using the -coverpkg=./... option as demonstrated in the provided answer, all packages within the project will be included in the coverage report.

By specifying ./... as the argument, the coverage analysis will encompass all subdirectories and their respective packages. This means that functions defined in the db/bar.go file will be accounted for when generating the coverage report.

Applying the -coverpkg flag ensures that when invoking a function in an external package, like bar.go, the coverage data will be accurately captured and displayed in the report. It allows for a comprehensive view of code coverage, eliminating the incomplete reporting of external package functions.

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