tests: Add missing tests

[fsbraun]

Summary by Sourcery

Add missing tests for plugin actions and HTML sanitization, and introduce Jest for JavaScript testing. Update package.json with Jest dependencies and configure GitHub Actions to run tests and upload coverage reports.

New Features:

• Introduce Jest testing framework with configurations for running tests, watching changes, and generating coverage reports.
• Add new JavaScript tests for CMS editor functionalities, including initialization, destruction, and plugin form handling.

Enhancements:

• Refactor test strings to use consistent double quotes for better readability and consistency.

Build:

• Update package.json to include Jest and related dependencies for testing.

CI:

• Modify GitHub Actions workflow to include running Jest tests and uploading coverage reports to Codecov.

Tests:

• Add missing tests for plugin actions and HTML sanitization, ensuring comprehensive coverage of existing functionalities.
• Introduce tests for dynamic attributes in HTML, verifying correct attribute setting and error handling.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request adds missing tests to the project, focusing on JavaScript unit tests for the CMS editor functionality and improving test coverage. The changes include setting up Jest testing infrastructure, adding new test files, and making minor code style improvements to existing Python tests.

Class diagram for new test classes

classDiagram
    class TestGetChildPluginCandidates {
        +test_get_child_plugin_candidates_whitelist()
        +test_get_child_plugin_candidates_blacklist()
        +test_get_child_plugin_candidates_no_whitelist_blacklist()
    }
    class DynamicAttributesTestCase {
        +test_dynamic_href_sets_correct_attribute()
        +test_dynamic_src_sets_correct_attribute()
        +test_render_dynamic_attributes_changes_html()
        +test_render_dynamic_attributes_fails()
        +test_render_dynamic_attributes_handles_no_dynamic_attributes()
    }
    class DjangoCMSPictureIntegrationTestCase {
        +setUp()
        +test_extract_images()
    }
    class HtmlSanitizerAdditionalProtocolsTests {
        +test_default_tag_escaping()
        +test_custom_tag_enabled()
        +test_default_attribute_escaping()
        +test_custom_attribute_enabled()
        +test_default_protocol_escaping()
        +test_custom_protocol_enabled()
        +test_clean_html_with_sanitize_enabled()
        +test_invalid_dynamic_link()
    }

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File-Level Changes

Change	Details	Files
Added Jest testing infrastructure and configuration	Added Jest and related testing dependencies to package.json Created Jest configuration file with test environment and coverage settings Added Babel configuration for modern JavaScript support Created test setup files and mock files for handling assets	package.json jest.config.js babel.config.js tests/js/setup-tests.js tests/js/__mocks__/fileMock.js tests/js/__mocks__/styleMock.js
Added JavaScript unit tests for CMS editor functionality	Created test file for CMS editor with comprehensive test cases Added tests for editor initialization and destruction Added tests for plugin form loading and markup requests Added tests for inline editor management	tests/js/cms.editor.test.js tests/js/example.test.js
Updated CI workflow to include JavaScript testing	Added Jest test execution step to frontend workflow Added coverage reporting to Codecov	.github/workflows/frontend.yml
Code style improvements in Python tests	Converted string quotes from single to double quotes Fixed line wrapping and indentation Improved code formatting consistency	tests/test_plugin.py tests/test_html.py

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