add tests for non-existent hints

parsing/src/autocomplete.rs

@@ -99,7 +99,7 @@ impl<'a> AutoComplete<'a> {
 					self.apply_hint(hint);
 				}
 			}
-			_ => unreachable!(),
+			Hint::None => {}
 		}
 	}
 

tests/autocomplete.rs

@@ -113,6 +113,29 @@ fn multi() {
 	]);
 }
 
+#[test]
+fn none() {
+	// string that should give no hints
+	let random = "qwert987gybhj";
+
+	ac_tester(&[
+		Action::SetString(random),
+		Action::AssertHint(""),
+		Action::Move(Movement::Up),
+		Action::AssertIndex(0),
+		Action::AssertString(random),
+		Action::AssertHint(""),
+		Action::Move(Movement::Down),
+		Action::AssertIndex(0),
+		Action::AssertString(random),
+		Action::AssertHint(""),
+		Action::Move(Movement::Complete),
+		Action::AssertString(random),
+		Action::AssertHint(""),
+		Action::AssertIndex(0),
+	]);
+}
+
 #[test]
 fn parens() {
 	ac_tester(&[