Changes for page Mocking

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1		-Software Engineering.Testing.WebHome
	1	+Software Architecture.Testing.WebHome

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1		-Markdown 1.2
	1	+XWiki 2.1

Content

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1		-### Purpose
	1	+=== Purpose ===
2	2
3		-* **Mocking simplifies unit testing by replacing the dependencies** of the unit being tested with simplified, simulated versions called mocks. 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.
	3	+* Mocking simplifies unit testing by replacing the dependencies of the unit being tested with simplified, simulated versions called mocks.
	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.
4	4
5		-### Benefits of Mocking
	6	+=== Benefits of Mocking ===
6	6
7	7	* Isolation of units to test each unit separately, dramatically reducing complexity and increasing test execution speed by replacing loaded modules with mocks.
8	8	* Simplifies the re-creation of specific scenarios (use cases, boundary cases).
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10	10	* Injection of test-specific behaviors not present in production code.
11	11	* Enables the simulation of indirect dependencies by letting mocks return other mocks.
12	12
13		-###
	14	+=== Types of Mocks ===
14	14
15		-### Types of Mocks
16		-
	16	+(% style="text-align: justify;" %)
17	17	Stubs are by far the most common type of mock. Keep your tests as simple as possible. Make them more complex only when necessary.
18	18
19	19	* **Stubs**: Simplest form, returning a hardcoded value or providing an empty method body.
20	20	* **Fake object**: Include minimal logic to handle different case scenarios.
21		-* **Spy**: Records internal data of the unit being tested when such data is not directly accessible.
22		-* **Mock object**: Contains complex logic, simulates behaviors such as computation and exception handling, and can even run tests.
	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.
23	23
24		-###
	24	+=== Tips ===
25	25
26		-### Tips
27		-
28		-* **Mock third-party libraries in unit tests** to ensure proper unit functionality. However, they should not be mocked in component and integration tests.
	26	+* **Mock third-party libraries for unit tests** to ensure proper unit functionality. Instead, use these libraries in component and integration tests.
29	29	* Aim for a **minimal number of dependencies in a unit** for easier testing and mocking:
30		- * 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.
31		- * Prefer many small classes/units to one large one for easier testing.
32		- * If a class has excessive dependencies, consider splitting it up or extracting some dependencies into a new class to create smaller, more cohesive units.
33		- * If a production class requires more than one test class, it's probably a sign that the class is too large.
34		- * Overly complex test code may indicate an overly large production class.
	28	+** 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.
	29	+** Prefer many small classes/units to one large one for easier testing.
	30	+** If a class has excessive dependencies, consider splitting it up or extracting some dependencies into a new class to create smaller, more cohesive units.
	31	+** If a production class requires more than one test class, it's probably a sign that the class is too large.
	32	+** Overly complex test code may indicate an overly large production class.