gorilla/mux provides the SetURLVars function for testing purposes, which you can use to inject your mock vars.

func TestGetRequest(t *testing.T) {
    r, _ := http.NewRequest("GET", "/test/abcd", nil)
    w := httptest.NewRecorder()

    //Hack to try to fake gorilla/mux vars
    vars := map[string]string{
        "mystring": "abcd",
    }

    // CHANGE THIS LINE!!!
    r = mux.SetURLVars(r, vars)
    
    GetRequest(w, r)

    assert.Equal(t, http.StatusOK, w.Code)
    assert.Equal(t, []byte("abcd"), w.Body.Bytes())
}