Full grapheme support (#45)

* Add full grapheme support

Continuing the work of @cammeresi ...

* Refactor tests

Author: sayanarijit

src/backend/crossterm.rs

@@ -128,37 +128,4 @@ impl EventHandler for Input {
 }
 
 #[cfg(test)]
-mod tests {
-    use super::*;
-    use ratatui::crossterm::event::{
-        Event, KeyCode, KeyEvent, KeyEventKind, KeyEventState, KeyModifiers,
-    };
-
-    #[test]
-    fn handle_tab() {
-        let evt = Event::Key(KeyEvent {
-            code: KeyCode::Tab,
-            modifiers: KeyModifiers::NONE,
-            kind: KeyEventKind::Press,
-            state: KeyEventState::NONE,
-        });
-
-        let req = to_input_request(&evt);
-
-        assert!(req.is_none());
-    }
-
-    #[test]
-    fn handle_repeat() {
-        let evt = Event::Key(KeyEvent {
-            code: KeyCode::Char('a'),
-            modifiers: KeyModifiers::NONE,
-            kind: KeyEventKind::Repeat,
-            state: KeyEventState::NONE,
-        });
-
-        let req = to_input_request(&evt);
-
-        assert_eq!(req, Some(InputRequest::InsertChar('a')));
-    }
-}
+mod tests;

src/backend/crossterm/tests.rs

@@ -0,0 +1,32 @@
+use super::*;
+use ratatui::crossterm::event::{
+    Event, KeyCode, KeyEvent, KeyEventKind, KeyEventState, KeyModifiers,
+};
+
+#[test]
+fn handle_tab() {
+    let evt = Event::Key(KeyEvent {
+        code: KeyCode::Tab,
+        modifiers: KeyModifiers::NONE,
+        kind: KeyEventKind::Press,
+        state: KeyEventState::NONE,
+    });
+
+    let req = to_input_request(&evt);
+
+    assert!(req.is_none());
+}
+
+#[test]
+fn handle_repeat() {
+    let evt = Event::Key(KeyEvent {
+        code: KeyCode::Char('a'),
+        modifiers: KeyModifiers::NONE,
+        kind: KeyEventKind::Repeat,
+        state: KeyEventState::NONE,
+    });
+
+    let req = to_input_request(&evt);
+
+    assert_eq!(req, Some(InputRequest::InsertChar('a')));
+}

src/backend/termion.rs

@@ -84,15 +84,4 @@ impl EventHandler for Input {
 }
 
 #[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn handle_tab() {
-        let evt = Event::Key(Key::Char('\t'));
-
-        let req = to_input_request(&evt);
-
-        assert!(req.is_none());
-    }
-}
+mod tests;

src/backend/termion/tests.rs

@@ -0,0 +1,10 @@
+use super::*;
+
+#[test]
+fn handle_tab() {
+    let evt = Event::Key(Key::Char('\t'));
+
+    let req = to_input_request(&evt);
+
+    assert!(req.is_none());
+}