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Testing (Blocks ("describe" blocks - use to wrap the class test…

- - - - Stubbing allows you to fake methods to make writing tests easier. You essentially predetermine a value and "create a journey" to check if you arrive at the same value.
      - Predetermine the return value
    - - double - Used to create a fake object instance
      - Con: Cannot test whether Class method is deprecated
        
        Solution: instance_double(Class) - picks up deprecated methods
  - - - Mocking allows you to make assertions about methods being called when you run your tests. Through mocking, you are essentially saying "when this method is called on a class, expect to receive certain arguments".
      - Predetermine the arguments
      - "Expect this class/object to be called with this method AND with these arguments"
      - We use mocking to ensure that the "right" methods are being called within the method we are currently testing.