public void Quantity_kindly_handle_the_default_quantity_with_null_Unit()
{
var qDef = new Quantity();
qDef.ToNormalizedString().Should().Be("0");
qDef.CanConvertTo(MeasureUnit.None).Should().BeTrue();
var kilo = 1.WithUnit(MeasureUnit.Kilogram);
qDef.CanConvertTo(kilo.Unit).Should().BeFalse();
qDef.CanAdd(kilo).Should().BeFalse();
kilo.CanAdd(qDef).Should().BeFalse();
var zeroKilo = qDef.Multiply(kilo);
zeroKilo.ToNormalizedString().Should().Be("0 kg");
(qDef * kilo).ToNormalizedString().Should().Be("0 kg");
(kilo * qDef).ToNormalizedString().Should().Be("0 kg");
(kilo.Multiply(qDef)).ToNormalizedString().Should().Be("0 kg");
(qDef / kilo).ToNormalizedString().Should().Be("0 kg-1");
var qDef2 = qDef.ConvertTo(MeasureUnit.None);
qDef2.ToNormalizedString().Should().Be("0");
}