This document discusses mock objects, which are test doubles used to verify interactions with other objects. Mock objects allow you to test objects in isolation without requiring real dependencies. The document outlines how to construct and use mock objects, when they are appropriate to use, and best practices around implementing mock objects in tests.

1. Mock Object
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2. How it works
SUT
Mock Object SUT
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3. When to use it
Untested Requirement
(pp.273)
↑
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4. Mock Object
Test Stub
equals
Mock Object
equals →Equality Pollution
(pp.217)
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5. Mock Object Equality
Assertions comparator
Mock Object
Mock Object Mock Object
Mock Object
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6. Implementation Notes
Mock Object SUT
Test Spy
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7. Mock Object 4
fixture
3
result verification phase
(“final verification”
)
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8. Fixture Setup
MockObject /
Exercise SUT
MocK Object
Result verification
“final verification”
Fixture teardown
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9. Construction
Four-Phase Test fixture setup phase
Mock Object
Configuration with Expected Values
Test Double Mock
Object
→Hard-Coded Test Double
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10. Installation
Test Double SUT
SUT
Dependency Injection Dependency Lookup
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11. Usage
SUT Mock Object
Assertion
( Mock Object
)
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12. Mock Object SUT
→happy path
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13. Final Verification
1
Mock Object toolkits teardown
final Verification
Method
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14. Motivating Example
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15. Refactoring Notes
Test Double
Mock Object
SUT
Mock Object 1
final verification method
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18. JUnit3 Mock Object TestCase
Assertion Method static
xUnit Family NUnit static
Assert
Ruby Test::Unit mixins
Assert
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19. Example: Mock Object
(Dynamically Generated)
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20. Further Reading
xUnit Mock Object
Mock Object
Test Stub Fake Object
→Appnendix B(pp.741)
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