How Can I Access Command Line Arguments in Go Tests?

Obtaining Command Line Arguments in Go Tests

When running tests with go test, the main function is not executed. This raises the question of how to access command line arguments in test cases.

A common approach is to use the flags package and manually check for arguments in each test or function. However, this method can become tedious and error-prone as the number of tests increases.

Instead, it is possible to use environmental variables or initialization functions to access command line arguments in tests.

Environmental Variables

Environmental variables provide a convenient way to pass configuration data to test environments. To access an environmental variable in a test, simply use the os.Getenv function:

envSetting := os.Getenv("TEST_ENV")

Initialization Functions

Alternatively, you can define an initialization function to set global variables based on command line arguments. The init() function is executed before any test cases, making it ideal for initialization purposes:

func init() {
    flags.Parse()
    myEnv = *envFlag
}

By utilizing these techniques, you can effectively access command line arguments in Go tests and maintain separation between test and main functionality.

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