Refactor Measurement Units to Use Constants in Mammotion Sensor

[mikey0000]

Description

• Refactored measurement units in MammotionSensorEntityDescription to use constants from homeassistant.const.
• Improved code maintainability and readability by replacing hardcoded unit strings with constants.

---

Changes walkthrough 📝

	Relevant files
Enhancement	sensor.py Refactor Measurement Units to Use Constants                            custom_components/mammotion/sensor.py Updated measurement units to use constants from homeassistant.const. Replaced string literals for units with appropriate constants for better clarity and maintainability. Enhanced the readability of the code by using predefined unit constants. +10/-9

[penify-dev]

PR Review 🔍

⏱️ Estimated effort to review [1-5]	2, because the changes are straightforward and primarily involve replacing string literals with constants, which is a common refactoring practice.
🧪 Relevant tests	No
⚡ Possible issues	No
🔒 Security concerns	No

[penify-dev]

PR Code Suggestions ✨

Category	Suggestion	Score
Best practice	Verify that all constants for unit measurements are properly defined and imported Ensure that all constants used for native_unit_of_measurement are defined and imported correctly to avoid runtime errors. custom_components/mammotion/sensor.py [66] -native_unit_of_measurement=UnitOfLength.MILLIMETERS, +native_unit_of_measurement=UnitOfLength.MILLIMETERS, # Ensure this constant is defined Suggestion importance[1-10]: 8 Why: This suggestion is crucial as it addresses the potential for runtime errors if constants are not properly defined, which can lead to significant issues in functionality.	8
Possible issue	Add error handling to the lambda functions to prevent potential attribute access errors Ensure that the value_fn lambda functions handle potential exceptions that may arise from accessing mower_data attributes. custom_components/mammotion/sensor.py [46] -value_fn=lambda mower_data: mower_data.connect.ble_rssi, +value_fn=lambda mower_data: getattr(mower_data.connect, 'ble_rssi', None), Suggestion importance[1-10]: 7 Why: This suggestion addresses potential runtime errors by adding error handling, which is important for robustness, but it may not be strictly necessary if the data structure is guaranteed.	7
	Validate the output of the value functions to ensure they fall within expected ranges Consider validating the values returned by the value_fn lambdas to ensure they are within expected ranges. custom_components/mammotion/sensor.py [74] -value_fn=lambda mower_data: mower_data.work.area & 65535, +value_fn=lambda mower_data: max(0, min(mower_data.work.area & 65535, MAX_AREA)), Suggestion importance[1-10]: 6 Why: Validating the output of the value functions is a good practice, but the suggestion does not address a major issue and is more about improving data integrity.	6
Maintainability	Replace hardcoded key values with constants for better maintainability Consider using a constant for the key values to avoid potential typos and improve maintainability. custom_components/mammotion/sensor.py [42] -key="ble_rssi", +key=KEY_BLE_RSSI, Suggestion importance[1-10]: 5 Why: While using constants for keys can improve maintainability, the suggestion does not address a critical issue in the code and is more of a stylistic improvement.	5