About: Mock trainwreck

In computer science, the term Mock Trainwreck refers to the difficulty of mocking a deeply nested model structure. Mocking is the creation of mock objects which can be used to mimic the behavior of real objects, often because it is hard to test with the real objects. A trainwreck is multiple levels of method calls (called a chain), which each return objects upon which new methods can be called. Deeply nested models go against the Law of Demeter because the property's property must be accessed. The Law of Demeter, also known as the principle of least knowledge is a design guideline to promote loose coupling of data structures that are not closely related, and thus should probably not be coupled together. In addition, this level of coupling can be considered an inappropriate intimacy code sm