test(inputdevices): add unit tests for UltraSonicSensorHelper

[j-heitz]

Resolves issue #361

Summary

Add comprehensive JUnit tests for com.opensourcewithslu.inputdevices.UltraSonicSensorHelper. Tests cover initialization, start/stop behavior, measurement flow, distance calculations (cm/m), and edge cases (negative duration, echo timeout). Logger is injected and assertions around logging are included where appropriate.

Motivation

Improve unit test coverage for sensor logic so changes are safer and hardware-independent. Tests mock GPIO interactions allowing CI to run without physical devices.

Changes

• Added tests in:
  • pi4micronaut-utils/src/test/java/com/opensourcewithslu/inputdevices/UltraSonicSensorHelperTest.java
• Tests included:
  • testInitialization — verifies trigger pin set low and initial distance is zero.
  • testStartMeasuring / testStartMeasuringWhenInactive — verify safe start behavior and inactivity handling.
  • testTriggerAndMeasureDistance / testTriggerAndMeasureDistanceTimeout — exercise measurement flow and timeout handling via reflection.
  • testCalculateDistance / testCalculateDistanceWithNegativeDuration — validate distance calculation and negative-duration handling.
  • testgetDistanceInCentemeter / testgetDistanceInMeters — unit conversion checks.
  • stopMeasuring / testStopMeasuringDeactivatesSensor — ensure stop is safe and deactivates measurements.
  • made changes to base class UltraSonicSensorHelper to allow testing of log messages and added log messages in startMeasuring and stopMeasuring

Files changed

• pi4micronaut-utils/src/test/java/com/opensourcewithslu/inputdevices/UltraSonicSensorHelperTest.java
• pi4micronaut-utils/src/main/com/opensourcewithslu/inputdevices/UltraSonicSensorHelper.java

How to test

• Run locally: ./gradlew test
• Confirm all unit tests pass in CI.

[CLAassistant]

All committers have signed the CLA.

[leandrumartin]

Great work on figuring out how to set up the testing and mocking! You still need to verify that appropriate log messages are being outputted and that errors are handled with appropriate error messages.

[leandrumartin]

Maybe your PR description is outdated, but under "Files Changed" it only lists one file, when in fact two are changed as you write elsewhere in the description. Always check LLM output carefully.

[leandrumartin]

Congrats on your first PR merge! 🎉