Unit Tests: Tree Building & Navigation

[gorbach]

internal/jobs/tree_test.go

• buildTree() - Converts flat job list to hierarchical tree
  • Test: single job, nested folders, level assignment, parent references
• flattenVisibleNodes() - Returns visible nodes respecting expand/collapse
  • Test: all expanded, collapsed folders hide children, mixed states
• expandPathToNode() - Expands all ancestors of target node
  • Test: deeply nested collapsed folders, already expanded paths
• collectAllNodes() - Returns all nodes (for search)
  • Test: excludes root, includes all descendants, maintains order
• toggleExpand() / expandNode() / collapseNode() - State management
  • Test: toggle behavior, non-folders don't expand, state persistence

Why: Complex recursive algorithm controlling UI rendering and navigation
Pattern: Table-driven tests using t.Run()