Webgl / add rendering tests for the vector layer renderer

test/rendering/cases/webgl-vector/main.js

@@ -0,0 +1,44 @@
+import GeoJSON from '../../../../src/ol/format/GeoJSON.js';
+import Layer from '../../../../src/ol/layer/Layer.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 WebGLVectorLayerRenderer from '../../../../src/ol/renderer/webgl/VectorLayer.js';
+import XYZ from '../../../../src/ol/source/XYZ.js';
+
+class WebGLLayer extends Layer {
+  createRenderer() {
+    return new WebGLVectorLayerRenderer(this, {
+      className: this.getClassName(),
+    });
+  }
+}
+
+const vector = new WebGLLayer({
+  source: new VectorSource({
+    url: '/data/countries.json',
+    format: new GeoJSON(),
+  }),
+});
+
+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: 1,
+  }),
+});
+
+render({
+  message:
+    'Countries are rendered as grey polygons using webgl and default shaders',
+});