Changes for page Mocking

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

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1		-XWiki 2.1
	1	+Markdown 1.2

Content

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1		-=== Purpose ===
	1	+### Purpose
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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.
	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.
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6		-=== Benefits of Mocking ===
	5	+### Benefits of Mocking
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8	8	* Isolation of units to test each unit separately, dramatically reducing complexity and increasing test execution speed by replacing loaded modules with mocks.
9	9	* Simplifies the re-creation of specific scenarios (use cases, boundary cases).
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11	11	* Injection of test-specific behaviors not present in production code.
12	12	* Enables the simulation of indirect dependencies by letting mocks return other mocks.
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14		-=== Types of Mocks ===
	13	+###
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16		-(% style="text-align: justify;" %)
	15	+### Types of Mocks
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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**: 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.
	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.
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24		-=== Tips ===
	24	+###
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26		-* **Mock third-party libraries for unit tests** to ensure proper unit functionality. Instead, use these libraries in component and integration tests.
	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.
27	27	* Aim for a **minimal number of dependencies in a unit** for easier testing and mocking:
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.
	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.