tmpenv

Easily set temporary environment variables and commandline flags, usually within a testing environment.

Quick start

SetEnvVar, SetEnvVars and AppendOSArgs all return a single func, which when executed will reset the given variables to their previous state.

Important note - Things may not work as expected if you run your tests in parallel!

Setting environment variables

func TestSomething(t *testing.T) {
    log.Println(os.Getenv("A")) // ""
    
    t.Run("test one", func(t *testing.T) {
        resetEnvVars := tmpenv.SetEnvVars(map[string]string{
            "A":     "123",
        })
        defer resetEnvVars()

        log.Println(os.Getenv("A")) // "123"
    })
    
    log.Println(os.Getenv("A")) // ""
    
    t.Run("test two", func(t *testing.T) {
        resetEnvVars := tmpenv.SetEnvVars(map[string]string{
            "A":     "456",
        })
        defer resetEnvVars()

        log.Println(os.Getenv("A")) // "456"
    })

    log.Println(os.Getenv("A")) // ""
}