How Can I Effectively Test Custom Command Line Flags in Go\'s Modular Unit Tests?

Overcoming Challenges with Custom Command Line Flags in Go's Unit Tests

Utilizing custom command line flags in Go unit tests can present difficulties when testing modules relying on these flags. This article delves into the issue raised in the question and offers a solution.

The question focuses on a specific challenge where a moduled application with tests requiring different sets of application modules faces issues with testing flag functionality. The author attempts to test a flag defined in one of the modules but encounters an error stating that the flag is not defined.

To address the error, the answer explains an intrinsic behavior of the go test command. When executed with a flag, it runs all tests in a workspace, applying the additional parameters to each test executable unless any of them are ignored within the test executable itself. This leads to a discrepancy where some tests pass and others fail due to flag implementation differences.

To overcome this issue, the answer suggests running go test separately for each _test.go file with the appropriate set of parameters. This allows for more granular control over flag usage within the individual test executables, ensuring consistent and accurate testing.

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