test: Add a browser based test harness (#2641)

tests/card-controller/automations-manager.browser.test.ts

@@ -0,0 +1,55 @@
+import { describe, expect, it } from 'vitest';
+
+import { MountedCard } from '../browser/mounted-card';
+import {
+  createStillCameraHASS,
+  createStillImageCardConfig,
+} from '../browser/test-utils';
+
+const TRIGGER_ENTITY = 'input_boolean.zoom';
+
+const mount = async (): Promise<MountedCard> => {
+  const hass = createStillCameraHASS({ entities: { [TRIGGER_ENTITY]: 'off' } });
+  return await MountedCard.create(
+    createStillImageCardConfig({
+      automations: [
+        {
+          triggers: [{ trigger: 'state', entity: TRIGGER_ENTITY, to: 'on' }],
+          actions: [
+            {
+              action: 'fire-dom-event',
+              advanced_camera_card_action: 'ptz_digital',
+              absolute: { zoom: 2 },
+            },
+          ],
+        },
+      ],
+    }),
+    hass,
+  );
+};
+
+describe('AutomationsManager', () => {
+  it('should run an automation only when a watched entity changes', async () => {
+    const card = await mount();
+
+    const zoomer = await card.waitForSelector('advanced-camera-card-zoomer');
+    expect(zoomer.hasAttribute('zoomed')).toBe(false);
+
+    // A new `hass` carrying no change at all. A card that acted on this would
+    // be reacting to the object rather than to what is in it.
+    card.renewHASS();
+    await card.card.updateComplete;
+
+    expect(zoomer.hasAttribute('zoomed')).toBe(false);
+
+    // The zoom is the far end of a chain that starts at the configuration: an
+    // entity the card was told to watch changed, the trigger matched, and the
+    // action it named actually ran. It also proves the assertion above was
+    // reporting a card that did nothing rather than a probe that never moves.
+    card.setEntityState(TRIGGER_ENTITY, 'on');
+    await card.events.waitForFirst('advanced-camera-card:zoom:zoomed');
+
+    expect(zoomer.hasAttribute('zoomed')).toBe(true);
+  });
+});