test: add more tests

tests/tui.rs

@@ -0,0 +1,14 @@
+use ratatui::backend::TestBackend;
+use ratatui::Terminal;
+use traxor::event::EventHandler;
+use traxor::tui::Tui;
+
+#[test]
+fn test_tui_new() {
+    let backend = TestBackend::new(10, 10);
+    let terminal = Terminal::new(backend).unwrap();
+    let events = EventHandler::new(250); // Dummy tick_rate
+    let _tui = Tui::new(terminal, events);
+    // Add assertions for initial state of Tui if applicable
+    // For example, if Tui has a field that should be initialized to a specific value
+}