new test

test/rendering/cases/heatmap-layer-opacity/main.js

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+import KML from '../../../../src/ol/format/KML.js';
+import Map from '../../../../src/ol/Map.js';
+import TileLayer from '../../../../src/ol/layer/Tile.js';
+import VectorSource from '../../../../src/ol/source/Vector.js';
+import View from '../../../../src/ol/View.js';
+import XYZ from '../../../../src/ol/source/XYZ.js';
+import {Heatmap as HeatmapLayer} from '../../../../src/ol/layer.js';
+
+const vector = new HeatmapLayer({
+  source: new VectorSource({
+    url: '/data/2012_Earthquakes_Mag5.kml',
+    format: new KML({
+      extractStyles: false,
+    }),
+  }),
+  blur: 3,
+  radius: 3,
+  opacity: 0.5,
+});
+
+vector.getSource().on('addfeature', function (event) {
+  const name = event.feature.get('name');
+  const magnitude = parseFloat(name.substr(2));
+  event.feature.set('weight', magnitude - 5);
+});
+
+const raster = new TileLayer({
+  source: new XYZ({
+    url: '/data/tiles/satellite/{z}/{x}/{y}.jpg',
+    transition: 0,
+  }),
+});
+
+new Map({
+  layers: [raster, vector],
+  target: 'map',
+  view: new View({
+    center: [0, 0],
+    zoom: 0,
+  }),
+});
+
+render({
+  message: 'Heatmap layer with opacity renders properly using webgl',
+});