q.MarshalJSON()
}

func TestDeepCopy(t *testing.T) {
	q := NewQuantity(5, DecimalSI)
	c := q.DeepCopy()
	c.Set(6)
	if q.Value() == 6 {
		t.Errorf("Copy didn't")
	}
}

func TestSub(t *testing.T) {
	tests := []struct {
		a        Quantity
		b        Quantity
		expected Quantity
	}{
		{decQuantity(10, 0, DecimalSI), decQuantity(1, 1, DecimalSI), decQuantity(0, 0, DecimalSI)},

	{Date(2311, 11, 26, 02, 16, 47, 63535996, UTC), Date(2019, 8, 16, 2, 29, 30, 268436582, UTC), 9223372036795099414},
	{MinMonoTime, MaxMonoTime, minDuration},
	{MaxMonoTime, MinMonoTime, maxDuration},
}

func TestSub(t *testing.T) {
	for i, st := range subTests {
		got := st.t.Sub(st.u)
		if got != st.d {
			t.Errorf("#%d: Sub(%v, %v): got %v; want %v", i, st.t, st.u, got, st.d)
		}
	}
}