Integration tests - TreeDataProvider + VSCode API (90% coverage)

[johnproblems]

Task: Integration tests - TreeDataProvider + VSCode API (90% coverage)

Description

Create integration tests for the TreeDataProvider that validate the complete Epic/Task hierarchy rendering in the VSCode tree view. Test the interaction between TreeDataProvider, TreeItem nodes, and VSCode's tree view APIs with 90% minimum coverage.

Acceptance Criteria

• Tests verify TreeDataProvider getChildren() returns correct hierarchy
• Tests validate TreeItem creation for Epic and Task nodes
• Tests check tree view registration and lifecycle
• Tests verify refresh behavior and onDidChangeTreeData events
• Tests validate tree expansion and collapse states
• Tests check context menu command availability
• Code coverage reaches minimum 90% (lines, branches, functions)
• All tests pass consistently

Technical Details

• Create test file: test/integration/treeview/treeDataProvider.test.ts
• Test scenarios:
  • Tree view registration with VSCode window API
  • getChildren() with null (root), Epic node, Task node
  • getTreeItem() returns properly configured TreeItem
  • Epic nodes have correct collapsible state
  • Task nodes have click commands configured
  • Tree refresh triggers onDidChangeTreeData
  • Empty epic handling (no tasks)
  • Invalid file path handling
  • Tree view reveal() functionality
• Use @vscode/test-electron for VSCode API integration
• Create test fixtures: sample epic/task files
• Test with actual VSCode tree view rendering
• Mock file system with test data
• Files affected: test/integration/treeview/*.test.ts (new)

Dependencies

• Task 13 - TreeDataProvider implementation completed
• Task 14 - TreeItem classes implemented
• Task 3 - Testing infrastructure configured

Effort Estimate

• Size: M
• Hours: 8
• Parallel: true

Definition of Done

• Code implemented
• Tests written and passing
• Documentation updated
• Code reviewed
• Coverage report shows 90%+ coverage
• Integration with VSCode API validated