Add state_class to Nuki battery sensor

[victor-gurbani]

Proposed change

This PR fixes the Nuki battery level sensor missing long-term statistics by setting the sensor’s state_class to "measurement".

Battery percentage is a value that benefits from being stored long-term. Without a state_class, the sensor is not eligible for long-term statistics, and users need to resort to manually customised overrides.

Type of change

• Bugfix (non-breaking change which fixes an issue)

Additional information

• This PR fixes or closes issue: N/A (no issue)
• This PR is related to issue: N/A
• Link to documentation pull request: N/A
• Link to developer documentation pull request: N/A
• Link to frontend pull request: N/A

Checklist

• I understand the code I am submitting and can explain how it works.
• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the [development checklist][dev-checklist]
• I have followed the [perfect PR recommendations][perfect-pr]
• The code has been formatted using Ruff (ruff format homeassistant tests)
• Tests have been added to verify that the new code works.
• Any generated code has been carefully reviewed for correctness and compliance with project standards.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for [www.home-assistant.io][docs-repository] (not needed)

If the code communicates with devices, web services, or third-party tools:

• The [manifest file][manifest-docs] has all fields filled out correctly. (not needed as manifest has not changed)
  Updated and included derived files by running: python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt. (not needed)
  Updated by running python3 -m script.gen_requirements_all.
• For the updated dependencies - a link to the changelog, or at minimum a diff between library versions is added to the PR description. (not needed)

To help with the load of incoming pull requests:

• I have reviewed two other open pull requests in this repository.

Commands I ran locally:

python -m ruff format homeassistant/components/nuki/sensor.py
python -m pytest tests/components/nuki

[home-assistant]

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[home-assistant]

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[home-assistant]

Hey there @pschmitt, @pvizeli, @pree, mind taking a look at this pull request as it has been labeled with an integration (nuki) you are listed as a code owner for? Thanks!

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Stale

[Copilot]

Pull request overview

This pull request adds the state_class attribute to the Nuki battery sensor to enable long-term statistics collection in Home Assistant. Battery level is a measurement that users want to track over time, and without a state_class, the sensor is not eligible for long-term statistics.

Key Changes

• Added SensorStateClass.MEASUREMENT to the Nuki battery sensor
• Updated test snapshots to reflect the new capability

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
homeassistant/components/nuki/sensor.py	Imported SensorStateClass and added _attr_state_class = SensorStateClass.MEASUREMENT to the NukiBatterySensor class
tests/components/nuki/snapshots/test_sensor.ambr	Updated test snapshots to include the new state_class capability in both entity registry and state attributes

The changes are well-implemented and follow Home Assistant patterns. The addition of SensorStateClass.MEASUREMENT to battery sensors is a common pattern used across many integrations in Home Assistant (e.g., August, Yale, and others). The test snapshots have been properly updated to reflect the new capability. No issues identified.

[jbouwh]

LGTM,
Thanks @victor-gurbani 👍