public void AddCurrencyTest()
{
var added = _group.Add(_gold, 100d);
Assert.IsNull(added.error);
Assert.IsTrue(added.result);
Assert.AreEqual(0d, _col1.GetAmount(_gold));
Assert.AreEqual(100d, _col2.GetAmount(_gold));
}
public Result <bool> AddCurrency(ICurrency currency, double amount)
{
return(currencies.Add(currency, amount));
}