public void Validates_properties_from_same_entity()
{
var entityType1 = new Model().AddEntityType(typeof(Customer));
var entityType2 = new Model().AddEntityType(typeof(Order));
var property1 = entityType1.GetOrAddProperty(Customer.IdProperty);
var property2 = entityType2.GetOrAddProperty(Order.NameProperty);
Assert.Equal(CoreStrings.KeyPropertiesWrongEntity($"{{'{property1.Name}', '{property2.Name}'}}", entityType1.DisplayName()),
Assert.Throws <ArgumentException>(
() => entityType1.AddKey(new[] { property1, property2 })).Message);
}