How to test the passing of arguments in Golang?

Question

package main

import (
    \"flag\"
    \"fmt\"
)

func main() {
    passArguments()
}

func passArguments() string {
    username := flag.String(\"user\", \"root\",         


        

Answer 1

Per my comment, the very first value in os.Args is a (path to) executable itself, so os.Args = []string{"cmd", "-user=bla"} should fix your issue. You can take a look at flag test from the standard package where they're doing something similar.

Also, as os.Args is a "global variable", it might be a good idea to keep the state from before the test and restore it after. Similarly to the linked test:

oldArgs := os.Args
defer func() { os.Args = oldArgs }()

This might be useful where other tests are, for example, examining the real arguments passed when evoking go test.