reset()

	ev := RegisterFloatVar(testVar, 123.0, "")
	v, present := ev.Lookup()
	if v != 123.0 {
		t.Errorf("Expected 123.0, got %v", v)
	}
	if present {
		t.Errorf("Expected not present")
	}

	v = ev.Get()
	if v != 123.0 {
		t.Errorf("Expected 123.0, got %v", v)
	}

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

	ev = RegisterFloatVar(testVar, 123.0, "")
	v, present = ev.Lookup()