Fix more Shelly tests for Python 3.14.3

[epenet]

Proposed change

Linked to https://github.com/home-assistant/core/actions/runs/24982630534/job/73149424430?pr=162263

Follow-up to #169301

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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[home-assistant]

Hey there @bieniu, @thecode, @chemelli74, @bdraco, mind taking a look at this pull request as it has been labeled with an integration (shelly) you are listed as a code owner for? Thanks!

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[Copilot]

Pull request overview

Adjusts Shelly integration tests to be robust under Python 3.14.3 by ensuring config entry setup completes (including background tasks) while simulating connection failures during device initialization.

Changes:

• Wrap selected config entry setups in a temporary initialize() failure to exercise “sleeping device” late-setup paths.
• Switch several hass.async_block_till_done() calls to wait_background_tasks=True to avoid leftover background tasks during/after test execution.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 5 comments.

File	Description
tests/components/shelly/test_coordinator.py	Updates a sleeping-device coordinator test to patch initialization failure and wait for background tasks during setup.
tests/components/shelly/test_config_flow.py	Updates multiple sleeping-device config flow tests to patch initialization failure and wait for background tasks during setup.

[Copilot]

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated no new comments.