How to Avoid \'flag provided but not defined\' Errors When Using Custom Command Line Flags in Go Unit Tests?

Custom Command Line Flags in Go's Unit Tests

Issue

When utilizing custom command line flags in Go's unit tests, users may encounter an error stating, "flag provided but not defined" when running tests with command line arguments.

Problem

The issue arises when multiple tests are included in a workspace using the ./... pattern. In this scenario, the compiler executes several test executables, each of which may have different flag requirements. The error occurs because some executables attempt to use undefined flags.

Solution

To resolve this issue, it is recommended to run go test individually for each _test.go file, providing the appropriate set of command line arguments for each test. This approach ensures that each executable receives only the expected flags, avoiding the undefined flag error.

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