public void ReadOnlyTest()
{
// Arrange
_currencies.Add(_gold, 10f);
_currencies.isReadOnly = true;
// Act
var canAdd = _currencies.CanAdd(_gold, 1f);
var add = _currencies.Add(_gold, 2);
var canRemove = _currencies.CanRemove(_gold, 1f);
var remove = _currencies.Remove(_gold, 2);
_currencies.Clear();
_currencies.Set(_gold, 1f);
// Assert
Assert.AreEqual(Errors.CollectionIsReadOnly, canAdd.error);
Assert.AreEqual(Errors.CollectionIsReadOnly, add.error);
Assert.AreEqual(Errors.CollectionIsReadOnly, canRemove.error);
Assert.AreEqual(Errors.CollectionIsReadOnly, remove.error);
Assert.IsFalse(canAdd.result);
Assert.IsFalse(add.result);
Assert.IsFalse(canRemove.result);
Assert.IsFalse(remove.result);
Assert.AreEqual(10f, _currencies.GetAmount(_gold));
}