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Stubs are by far the most common type of mock. Keep your tests as simple as possible. Make them more complex only when necessary. |
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-* **Stubs**: Simplest form, returning a hardcoded value or providing an empty method body. |
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-* **Fake object**: Include minimal logic to handle different case scenarios. |
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-* **Spy**: Injected to capture interaction data with fake objects when such data is not directly accessible. |
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-* **Mock objects**: Contain complex logic, simulate behaviors such as computation and exception handling, and even run tests. |
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+* Stubs: Simplest form, returning a hardcoded value or providing an empty method body. |
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+* Fake object: Include minimal logic to handle different case scenarios. |
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+* Spy: Injected to capture interaction data with fake objects when such data is not directly accessible. |
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+* Mock objects: Contain complex logic, simulate behaviors such as computation and exception handling, and even run tests. |
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=== Tips === |
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-* **Mock third-party libraries for unit tests** to ensure proper unit functionality. Instead, use these libraries in component and integration tests. |
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-* Aim for a **minimal number of dependencies in a unit** for easier testing and mocking: |
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-** 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. |
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-** Prefer many small classes/units to one large one for easier testing. |
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-** If a class has excessive dependencies, consider splitting it up or extracting some dependencies into a new class to create smaller, more cohesive units. |
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-** If a production class requires more than one test class, it's probably a sign that the class is too large. |
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-** Overly complex test code may indicate an overly large production class. |
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+* Mock third-party libraries for unit tests to ensure proper unit functionality. Instead, use the third-party libraries in component and integration tests. |
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+* Minimize the dependencies of a unit. The fewer dependencies, the easier it is to mock and test the logic. |
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+** 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. |
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+** If there is more than one test class for a production class, the production class is probably too large. |
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+** If the test code is very complex and hard to understand, the production class is probably too large. |
