Spying is used to assert if a method has been called, here we will see how to use spies with Rspec.
Spies are similar to mock in the way that both assert if a method was called. But they are different in many ways.
One difference is that mocks have the
assert before the
action, while spies have
Hence spies follow the Arrange-Act-Assert pattern which make tests easy to read and understand.
In Rspec, you just call
spy to create a spy object. Here is a simple (but realistic) example of how to use spies with rspec:
Notice that the example has three distinct sections