[tests] Improve unit test coverage for plugins

[cbentejac]

Description

This pull request adds comprehensive tests for plugin configuration loading and environment variable handling in the plugin system. It introduces a new test class for verifying how plugin configuration files and environment variables interact, and adds a utility context manager to simplify plugin registration and cleanup during tests.

New plugin configuration tests:

• Added TestPluginsConfiguration class in tests/test_plugins.py with tests to verify that plugin configuration files are loaded correctly, and that environment variables override or coexist with config file values as expected. The tests cover scenarios with all, some, or none of the relevant environment variables set.

Test utilities:

• Introduced registeredPlugins context manager in tests/utils.py to handle loading and cleanup of plugins from a test folder, streamlining the setup and teardown of plugin-related tests.
• Updated imports in tests/test_plugins.py and tests/utils.py to use the new registeredPlugins utility and ensure necessary modules are available. [1] [2]

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.04%. Comparing base (5dda2ac) to head (4a2f540).
⚠️ Report is 118 commits behind head on develop.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2866      +/-   ##
===========================================
+ Coverage    77.46%   78.04%   +0.58%     
===========================================
  Files           48       48              
  Lines         6735     6809      +74     
===========================================
+ Hits          5217     5314      +97     
+ Misses        1518     1495      -23     

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[Copilot]

Pull Request Overview

This pull request enhances test coverage for the plugin system by adding comprehensive tests for plugin configuration loading and environment variable handling. It introduces a new test class to verify plugin configuration behavior and provides test utilities to simplify plugin testing.

• Added TestPluginsConfiguration class with tests covering configuration file loading and environment variable interactions
• Introduced registeredPlugins context manager for streamlined plugin setup/teardown in tests
• Created test configuration file to support plugin configuration testing scenarios

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 5 comments.

File	Description
tests/utils.py	Added registeredPlugins context manager and necessary imports for plugin testing utilities
tests/test_plugins.py	Added comprehensive plugin configuration tests and updated imports to use new utilities
tests/plugins/meshroom/config.json	Created test configuration file with sample plugin configuration data

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