Wait for full animation preview duration

test/region-layout.test.js

@@ -383,7 +383,13 @@ test('slide advanced popup applies changes, cancels drafts and preserves the par
   };
   const modalInstances = new Map();
   const scrollBarCalls = [];
-  const context = { window: { innerWidth: 1200, setTimeout() { return 1; }, clearTimeout() {}, pulseModal: {
+  const previewTimers = [];
+  const context = { window: { innerWidth: 1200,
+    setTimeout(_callback, delay) { previewTimers.push(delay); return previewTimers.length; }, clearTimeout() {},
+    getComputedStyle() {
+      return { animationDuration: '400ms' };
+    },
+    pulseModal: {
     show(modal) { this.getOrCreate(modal)._scrollBar.hide(); modal.shown = true; },
     hide(modal) { this.getOrCreate(modal)._scrollBar.reset(); modal.shown = false; modal.handlers['hidden.bs.modal'](); },
     getOrCreate(modal) {
@@ -410,7 +416,7 @@ test('slide advanced popup applies changes, cancels drafts and preserves the par
     getTemplate() { return { regions: [
       { region_key: 'hero', animation_json: { intro: { preset: 'bounceIn' }, outro: { preset: 'fadeOut' } } },
       { region_key: 'fixed_brand', read_only: true, animation_json: {
-        outro: { preset: 'fadeOut', duration_ms: 200, delay_ms: 500 },
+        outro: { preset: 'hinge', duration_ms: 200, delay_ms: 500 },
         loop: { preset: 'pulse', duration_ms: 200, delay_ms: 240, iterations: 1 }
       } },
       { region_key: 'fixed_brand_second', read_only: true, animation_json: { loop: { preset: 'pulse', duration_ms: 200, iterations: 1 } } }
@@ -432,6 +438,7 @@ test('slide advanced popup applies changes, cancels drafts and preserves the par
   animationPreviewButtons[1].handlers.click();
   assert.equal(readonlyPreviewRegion.style.values['animation-delay'], '0ms');
   animationPreviewButtons[1].handlers.click();
+  assert.equal(previewTimers[previewTimers.length - 1], 580);
   const resetRegion = ids['slide-animation-reset-region'];
   const resetAll = ids['slide-animation-reset-all'];
   assert.equal(resetRegion.disabled, true);