Use websocket fixture in deCONZ sensor tests

[Kane610]

Breaking change

Proposed change

Depends on #47738
Use new websocket fixture
Localize test fixtures
Improve asserts

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Example entry for configuration.yaml:

# Example configuration.yaml

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue: Deconz websocket fixture #47738
• Link to documentation pull request:

Checklist

• 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
• The code has been formatted using Black (black --fast homeassistant tests)
• Tests have been added to verify that the new code works.

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

• Documentation added/updated for www.home-assistant.io

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

• The manifest file has all fields filled out correctly.
  Updated and included derived files by running: python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt.
  Updated by running python3 -m script.gen_requirements_all.
• Untested files have been added to .coveragerc.

The integration reached or maintains the following Integration Quality Scale:

• No score or internal
• 🥈 Silver
• 🥇 Gold
• 🏆 Platinum

To help with the load of incoming pull requests:

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

[frenck]

Nice! 👍

One line missing, would be nice to address that in a future PR

----------- coverage: platform linux, python 3.9.2-final-0 -----------
Name                                                Stmts   Miss  Cover   Missing
---------------------------------------------------------------------------------
homeassistant/components/deconz/sensor.py             140      1    99%   172

[Kane610]

Nice! 👍

One line missing, would be nice to address that in a future PR

----------- coverage: platform linux, python 3.9.2-final-0 -----------
Name                                                Stmts   Miss  Cover   Missing
---------------------------------------------------------------------------------
homeassistant/components/deconz/sensor.py             140      1    99%   172

Its on my ToDo :)

[Kane610]

Thanks @frenck 🎉