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//! Integration tests for lex binary
//!
//! These tests verify the full application workflow using TestApp infrastructure
// The tests module is defined in the binary crate
// We access it through the binary's module structure
// For now, we'll document what integration tests we want to write:
//
// 1. FileViewer Arrow Key Navigation
// - Create app with content
// - Send arrow keys
// - Verify cursor position changes
// - Verify SelectPosition events update model
//
// 2. Focus Switching
// - Start in FileViewer
// - Press Tab
// - Verify TreeViewer now focused
// - Verify UI shows [FOCUSED] indicator
//
// 3. Tree Node Expansion (Step 8)
// - Select file position
// - Verify corresponding tree node is identified
// - Verify node is auto-expanded so it's visible
//
// 4. Tree Navigation (Step 9)
// - Navigate tree with arrow keys
// - Expand/collapse with Left/Right
// - Verify selection synchronizes between viewers
//
// 5. Full Render Output Verification
// - Use insta snapshots to verify UI layout
// - Verify title bar shows file name
// - Verify tree viewer width is 30 chars
// - Verify file viewer fills remaining space
// - Verify info panel at bottom
// Note: Integration tests will be written here once TestApp is accessible
// from the binary module. Current placeholder keeps file structure in place.