10.05 Unit Tests Subsystems - Quiz

Section 10.5 Quiz: Unit Tests for Subsystems

1. What is the main purpose of test fixtures in mechatronic testing?

   • To hold physical components in place
   • To provide controlled substitutes for hardware components {data-correct}
   • To measure electrical current
   • To calibrate sensors

2. Which testing principle ensures that tests produce the same results every time they run?

   • Isolation
   • Repeatability {data-correct}
   • Fast execution
   • Clear assertions

3. What is dependency injection in the context of testable system design?

   • Injecting power into system components
   • Providing system dependencies through constructor parameters {data-correct}
   • Adding test code directly into production classes
   • Connecting hardware components physically

4. Mock devices in unit testing should:

   • Be identical to real hardware
   • Provide predictable, controllable behaviour {data-correct}
   • Always return the same values
   • Only work with simple systems

5. When testing a temperature controller, which scenarios should be included in comprehensive tests?

   • Normal operation within target range {data-correct}
   • Safety limit enforcement {data-correct}
   • Sensor failure handling {data-correct}
   • Only successful temperature control

6. What is the advantage of testing control logic separately from hardware interfaces?

   • Tests run faster without hardware delays {data-correct}
   • Hardware failures don’t affect test results {data-correct}
   • Tests can run without expensive equipment {data-correct}
   • Tests become more complex

7. Integration tests with multiple fixtures are useful for:

   • Testing individual components in isolation
   • Verifying subsystem interactions work correctly {data-correct}
   • Replacing all unit tests
   • Testing only hardware components

8. A well-designed mock sensor should be able to:

   • Simulate various failure modes {data-correct}
   • Provide controlled test data {data-correct}
   • Add realistic noise to readings {data-correct}
   • Only return perfect measurements