This document contains detailed notes from Lecture 12 of the CO2401 course on Software Development. The lecture focuses on advanced unit testing techniques, specifically the use of mocking frameworks to simulate and test interactions between a unit of code and its dependencies.
Recap: Terminology and Principles Related to Mocking Frameworks
1. Mocking:
o Mock Objects: Simulated objects that mimic the behavior of real
objects in controlled ways, used to test the interactions of a unit
with its dependencies.
o Purpose: Helps isolate the unit under test by simulating the
behavior of its dependencies, ensuring the test focuses solely on
the unit itself.
2. Why Use Mocking Frameworks?
o Efficiency: Hand-coding stubs and mocks is time-consuming and
prone to errors. Mocking frameworks automate the creation of fake
objects, making tests easier to write, read, and maintain.
o Popular Frameworks: MOQ, FakeItEasy, NSubstitute. NSubstitute
is highlighted for its focus on test readability and familiar syntax.
Interaction Testing
1. Types of Testing in Unit Tests:
o Value-Based Testing: Validates the return values of a method.
o State-Based Testing: Ensures that the internal state of the unit
under test changes as expected.
o Interaction Testing: Verifies that the unit under test interacts
correctly with other objects by calling their methods.
2. When to Use Interaction Testing:
o Interaction testing is essential when the primary outcome of a unit
of work is calling a method on another object. Mock objects help
verify that these interactions occur as expected.
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