Add unit tests for WorkspaceUsersManagement component

Created by: Copilot

Overview

This PR implements comprehensive unit tests for the WorkspaceUsersManagement component, which was previously only containing a placeholder test.todo.

Changes

Added 7 unit tests covering the core functionality of the WorkspaceUsersManagement component:

• Component rendering: Tests verify the component renders successfully with workspaces and displays both the toolbar and workspace users sections
• State management: Tests validate that the selected workspace state is properly initialized and displayed
• Props propagation: Tests ensure correct props (workspace ID and active user) are passed to child components
• User interactions: Tests simulate workspace selection changes and verify the UI updates accordingly
• Edge cases: Tests handle scenarios like empty workspace arrays and conditional rendering logic

Testing Approach

The tests follow existing patterns in the codebase:

• Mock the useWorkspaces hook to control test data
• Mock child components (WorkspaceUsersToolbar and WorkspaceUsers) to isolate the component under test
• Use @testing-library/react for rendering and assertions
• Use @testing-library/user-event for simulating user interactions
• Leverage existing test utilities (providersRender, getMockedUser, getMockedWorkspace)

Validation

✅ All 7 tests pass
✅ Linting passes with no errors
✅ Type checking passes
✅ Follows existing test conventions in the repository

Test Coverage

The tests provide good coverage of the component's behavior:

• Initial rendering and default workspace selection
• Workspace toolbar display
• Workspace users display with correct props
• Interactive workspace switching
• Empty state handling
• Conditional rendering logic

This ensures the component's core functionality is well-tested and future changes can be validated against expected behavior.

Original prompt

Implement simple unit tests for web_ui/src/pages/user-management/workspaces/workspace-users-management.test.tsx

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