How Can I Parse Command Line Arguments in Go Tests?

Parsing Command Line Arguments in Go "tests"

When utilizing the "go test" command, the main function of your application is not invoked, leaving developers wondering how to handle command line arguments within tests.

Although it is possible to employ the flags package and check for arguments in each test or function, this approach is cumbersome, requiring extensive repetition.

For certain scenarios, bypassing unit test purity and passing arguments via the command line may be an acceptable solution, as it offers benefits such as avoiding reliance on environment variables and providing functional flexibility.

One method involves defining an init() function within a _test file. When the test suite is executed, this function will be invoked and initialize variables based on command line arguments, simulating the behavior of the main function when the application is run directly.

Alternatively, if the flags package is a necessary requirement, initialization code can be placed within an init() function inside the testing.t struct. This allows the parsing of flags to occur before the execution of test cases.

For example:

func init() {
    flag.Parse()
    envSetting = flag.String("env", "", "Environment setting")
}

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