How to Properly Test Custom Command-Line Flags in Go Unit Tests?

Testing Custom Command-Line Flags in Go Unit Tests

In a modular Go application with unit tests, setting custom command-line flags for specific tests can prove challenging. Using the flag package to set flags in test initialization may result in errors when running the tests.

Problem

When executing the test command:

go test -test.v ./... -gamedir.custom=c:/resources

the following error may occur:

flag provided but not defined: -gamedir.custom

This error indicates that the -gamedir.custom flag is not recognized by the test executable.

Analysis

The issue arises because the go test command runs all tests in a workspace, applying the provided flags to all of them. However, if a specific test does not use the -gamedir.custom flag, the test execution will fail with the undefined flag error.

Solution

To resolve this problem, you can run go test separately for each test executable, specifying the appropriate flags for each test. This can be done by modifying the command to pass the test executable directly:

go test -test.v ./path/to/test.go -gamedir.custom=c:/resources

This approach ensures that only the specified test executable receives the -gamedir.custom flag, resolving the undefined flag error.

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