func TestInt(t *testing.T) {
	reset()

	ev := RegisterIntVar(testVar, 123, "")
	v, present := ev.Lookup()
	if v != 123 {
		t.Errorf("Expected 123, got %v", v)
	}
	if present {
		t.Errorf("Expected not present")
	}

	v = ev.Get()
	if v != 123 {
		t.Errorf("Expected 123, got %v", v)
	}

	_ = os.Setenv(testVar, "XXX")

	ev = RegisterIntVar(testVar, 123, "")
	v, present = ev.Lookup()