audit combobox

crates/core/tests/combobox.rs

@@ -2,8 +2,8 @@ use std::cell::RefCell;
 use std::rc::Rc;
 
 use gpui::{
-    AppContext as _, Context, Entity, IntoElement, ParentElement as _, Render, SharedString,
-    Styled as _, TestAppContext, VisualTestContext, Window, div,
+    AppContext as _, Context, Entity, IntoElement, MouseButton, ParentElement as _, Render,
+    SharedString, Styled as _, TestAppContext, VisualTestContext, Window, div, point, px,
 };
 use gpui_native_core::combobox::{Combobox, ComboboxOption, ComboboxState};
 use gpui_native_core::init;
@@ -99,6 +99,31 @@ fn draw(visual: &mut VisualTestContext) {
     });
 }
 
+fn click(visual: &mut VisualTestContext, position: gpui::Point<gpui::Pixels>) {
+    visual.simulate_mouse_down(position, MouseButton::Left, gpui::Modifiers::default());
+    visual.simulate_mouse_up(position, MouseButton::Left, gpui::Modifiers::default());
+}
+
+/// Clicking into a valueless combobox field opens the options right away:
+/// no keystroke is needed to see the choices.
+#[test]
+fn clicking_the_empty_field_opens_the_popup() {
+    let mut host = combo_host(false, false);
+
+    // Inside the field, which sits at the top of the padded host.
+    click(&mut host.visual, point(px(100.), px(27.)));
+    draw(&mut host.visual);
+
+    assert!(
+        host.state.read_with(&host.cx, |state, _| state.is_open()),
+        "clicking the empty field should show the options"
+    );
+    assert!(
+        host.visual.debug_bounds("test-combo-panel").is_some(),
+        "the options panel should be rendered"
+    );
+}
+
 fn focus(host: &mut ComboHost) {
     let state = host.state.clone();
     host.visual.update(|window, cx| {