Improve tests in WLED

[mik-laj]

Breaking change

This PR address a few problem discussed in #155482

And besides that, it consolidated error handling tests using parametrization (config_flow, button, light)

Proposed change

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)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
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Hey there @frenck, mind taking a look at this pull request as it has been labeled with an integration (wled) you are listed as a code owner for? Thanks!

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[Copilot]

Pull request overview

This PR improves test quality and coverage in the WLED integration by:

• Migrating to snapshot-based testing across multiple platform test files
• Using pytest.mark.parametrize to consolidate duplicate error handling tests
• Replacing manual time mocking with the freezer fixture from freezegun
• Adding platform override fixtures to ensure only relevant platforms are loaded during tests
• Updating quality_scale.yaml to mark test coverage improvements as complete

Key Changes

• Consolidated error handling tests using parametrization (config_flow, button, light)
• Replaced verbose attribute assertions with snapshot comparisons
• Added override_platforms fixtures to limit platform loading during tests
• Updated coordinator tests to use freezer.tick() instead of dt_util.utcnow()

Reviewed changes

Copilot reviewed 17 out of 17 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
test_update.py	Added snapshot testing, platform override fixture, removed redundant assertions
test_switch.py	Added snapshot test, platform override, removed duplicate state/entity/device assertions from behavior tests
test_sensor.py	Converted to snapshot testing, added platform override, removed 100+ lines of manual assertions
test_select.py	Added snapshot test, platform override fixture
test_number.py	Added snapshot test, platform override fixture
test_light.py	Added comprehensive snapshot tests, parametrized error tests to consolidate duplicates
test_button.py	Added snapshot tests, parametrized error tests, separated device snapshot test
test_coordinator.py	Replaced dt_util.utcnow() with freezer.tick() for time manipulation
test_config_flow.py	Parametrized error tests, introduced CONFIG constant for reusability
quality_scale.yaml	Marked config-flow-test-coverage and test-coverage as done
snapshots/*.ambr	Added comprehensive snapshot files for all platforms