add sanity test for all combination of key inputs

src/highlight.rs

@@ -275,7 +275,7 @@ mod tests {
 
     #[test]
     #[rustfmt::skip]
-    fn test_line_display_text() {
+    fn line_display_text() {
         assert_eq!(&build(      "",  0,      None),                  "");
         assert_eq!(&build(      "",  4,      None),                  "");
         assert_eq!(&build(      "",  8,      None),                  "");

tests/input.rs

@@ -0,0 +1,75 @@
+use tui_textarea::{Input, Key, TextArea};
+
+// Sanity test for checking textarea does not crash against all combination of inputs
+#[test]
+fn test_input_all_combinations_sanity() {
+    use Key::*;
+
+    fn push_all_modifiers_combination(inputs: &mut Vec<Input>, key: Key) {
+        for ctrl in [true, false] {
+            for alt in [true, false] {
+                for shift in [true, false] {
+                    inputs.push(Input {
+                        key,
+                        ctrl,
+                        alt,
+                        shift,
+                    });
+                }
+            }
+        }
+    }
+
+    let mut inputs = vec![];
+
+    for c in ' '..='~' {
+        push_all_modifiers_combination(&mut inputs, Char(c));
+    }
+    for i in 0..=15 {
+        push_all_modifiers_combination(&mut inputs, F(i));
+    }
+    for k in [
+        Null,
+        Char('あ'),
+        Char('🐶'),
+        Backspace,
+        Enter,
+        Left,
+        Right,
+        Up,
+        Down,
+        Tab,
+        Delete,
+        Home,
+        End,
+        PageUp,
+        PageDown,
+        Esc,
+        MouseScrollDown,
+        MouseScrollUp,
+    ] {
+        push_all_modifiers_combination(&mut inputs, k);
+    }
+
+    let mut t = TextArea::from(["abc", "def", "ghi", "jkl", "mno", "pqr"]);
+
+    for input in inputs {
+        t.input(input.clone());
+        t.input_without_shortcuts(input);
+    }
+}
+
+#[test]
+fn test_insert_multi_code_unit_emoji() {
+    let mut t = TextArea::default();
+    for c in "👨‍👩‍👧‍👦".chars() {
+        let input = Input {
+            key: Key::Char(c),
+            ctrl: false,
+            alt: false,
+            shift: false,
+        };
+        assert!(t.input(input), "{c:?}");
+    }
+    assert_eq!(t.lines(), ["👨‍👩‍👧‍👦"]);
+}