| ... | ... | @@ -3,8 +3,6 @@ | 
              
                    | 3 | 3 | * Mocking simplifies unit testing by replacing the dependencies of the unit being tested with simplified, simulated versions called mocks. | 
              
                    | 4 | 4 | * Example: Consider a unit under test that relies on a database. In testing, the database can be mocked to return a static value, eliminating the need for an actual database. | 
              
                    | 5 | 5 |  | 
              
                    | 6 |  | -===   === | 
              
                    | 7 |  | - | 
              
                    | 8 | 8 | === Benefits of Mocking === | 
              
                    | 9 | 9 |  | 
              
                    | 10 | 10 | * Isolation of units to test each unit separately, dramatically reducing complexity and increasing test execution speed by replacing loaded modules with mocks. | 
                      
        | ... | ... | @@ -13,26 +13,20 @@ | 
              
                    | 13 | 13 | * Injection of test-specific behaviors not present in production code. | 
              
                    | 14 | 14 | * Enables the simulation of indirect dependencies by letting mocks return other mocks. | 
              
                    | 15 | 15 |  | 
              
                    | 16 |  | -===   === | 
              
                    | 17 |  | - | 
              
                    | 18 | 18 | === Types of Mocks === | 
              
                    | 19 | 19 |  | 
              
                    | 20 | 20 | (% style="text-align: justify;" %) | 
              
                    | 21 | 21 | Stubs are by far the most common type of mock. Keep your tests as simple as possible. Make them more complex only when necessary. | 
              
                    | 22 | 22 |  | 
              
                    | 23 |  | -* **Stubs**: Simplest form, returning a hardcoded value or providing an empty method body. | 
              
                    | 24 |  | -* **Fake object**: Include minimal logic to handle different case scenarios. | 
              
                    | 25 |  | -* **Spy**:Recordsinternaldataof theunit being testedwhen such data is not directly accessible. | 
              
                    | 26 |  | -* **Mock object**: Containscomplex logic, simulatesbehaviors such as computation and exception handling, andcan even run tests. | 
              
                    |  | 19 | +* Stubs: Simplest form, returning a hardcoded value or providing an empty method body. | 
              
                    |  | 20 | +* Fake object: Include minimal logic to handle different case scenarios. | 
              
                    |  | 21 | +* Spy: Injected to capture interaction data with fake objects when such data is not directly accessible. | 
              
                    |  | 22 | +* Mock objects: Contain complex logic, simulate behaviors such as computation and exception handling, and even run tests. | 
              
                    | 27 | 27 |  | 
              
                    | 28 |  | -===   === | 
              
                    | 29 |  | - | 
              
                    | 30 | 30 | === Tips === | 
              
                    | 31 | 31 |  | 
              
                    | 32 |  | -* **Mock third-party libraries in unit tests** to ensure proper unit functionality. Instead, use these libraries in component and integration tests. | 
              
                    | 33 |  | -* Aim for a **minimal number of dependencies in a unit** for easier testing and mocking: | 
              
                    | 34 |  | -** Limit dependencies in a unit in a similar way to the best practices for function arguments: the fewer the better, with an absolute maximum of three. | 
              
                    | 35 |  | -** Prefer many small classes/units to one large one for easier testing. | 
              
                    | 36 |  | -** If a class has excessive dependencies, consider splitting it up or extracting some dependencies into a new class to create smaller, more cohesive units. | 
              
                    | 37 |  | -** If a production class requires more than one test class, it's probably a sign that the class is too large. | 
              
                    | 38 |  | -** Overly complex test code may indicate an overly large production class. | 
              
                    |  | 26 | +* Mock third-party libraries for unit tests to ensure proper unit functionality. Instead, use the third-party libraries in component and integration tests. | 
              
                    |  | 27 | +* Minimize the dependencies of a unit. The fewer dependencies, the easier it is to mock and test the logic. | 
              
                    |  | 28 | +** If a class has too many dependencies, split the class or extract two dependencies into a new class. This also results in smaller, more cohesive classes/units. | 
              
                    |  | 29 | +** If there is more than one test class for a production class, the production class is probably too large. | 
              
                    |  | 30 | +** If the test code is very complex and hard to understand, the production class is probably too large. |