Cover public text editing behavior

tests/text_edit.rs

@@ -0,0 +1,67 @@
+use iris::prelude::*;
+
+fn editor(text: &str, mode: EditMode) -> (TextEdit, TextData) {
+    let view = TextView::new(TextBuffer::new(text), TextAttrs::default(), None);
+    (TextEdit::new(view, mode), TextData::default())
+}
+
+fn press(edit: &mut TextEditCtx<'_>, x: f32) {
+    edit.select(vec2(x, 10.0), vec2(400.0, 200.0), false, false);
+}
+
+#[test]
+fn pressing_an_empty_field_places_input() {
+    let (mut text, mut data) = editor("", EditMode::SingleLine);
+    let mut edit = TextEditCtx {
+        text: &mut text,
+        data: &mut data,
+    };
+
+    press(&mut edit, 40.0);
+    edit.insert("hello");
+
+    assert_eq!(edit.text.content(), "hello");
+}
+
+#[test]
+fn preedit_replaces_the_previous_composition() {
+    let (mut text, mut data) = editor("", EditMode::SingleLine);
+    let mut edit = TextEditCtx {
+        text: &mut text,
+        data: &mut data,
+    };
+
+    press(&mut edit, 0.0);
+    edit.replace(0, "に");
+    edit.replace(1, "日本");
+
+    assert_eq!(edit.text.content(), "日本");
+}
+
+#[test]
+fn backspace_respects_utf8_boundaries() {
+    let (mut text, mut data) = editor("aé", EditMode::SingleLine);
+    let mut edit = TextEditCtx {
+        text: &mut text,
+        data: &mut data,
+    };
+
+    press(&mut edit, f32::MAX);
+    edit.backspace(false);
+
+    assert_eq!(edit.text.content(), "a");
+}
+
+#[test]
+fn typing_replaces_the_selection() {
+    let (mut text, mut data) = editor("hello", EditMode::SingleLine);
+    let mut edit = TextEditCtx {
+        text: &mut text,
+        data: &mut data,
+    };
+
+    edit.select_all();
+    edit.insert("goodbye");
+
+    assert_eq!(edit.text.content(), "goodbye");
+}