Created comprehensive tests for cross-project Kanban functionality: 1. Unit Tests (dashboard_controller_spec.rb): - Tests for all_projects=true parameter handling - Tests for project_id parameter handling - Tests for archived projects exclusion - Tests for project associations loading - Tests for empty states 2. Integration Tests (kanban_cross_project_spec.rb): - Tests for single project view - Tests for all projects view - Tests for project switching functionality - Tests for project selector dropdown - Tests for project badge display on cards - Tests for proper column organization across projects - Tests for empty states - Tests for priority indicators and agent display 3. Performance Tests (kanban_performance_spec.rb): - Query count tests for single and all-projects modes - N+1 query prevention tests - Scalability tests with many tickets - Database index usage verification - Memory usage tests NOTE: All test files need to be manually copied from /tmp/ to their respective locations due to file permission issues.