Organize tests

test/rendering/cases/source-vectortile-declutter/main.js

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+import Feature from '../../../../src/ol/Feature.js';
+import Map from '../../../../src/ol/Map.js';
+import Point from '../../../../src/ol/geom/Point.js';
+import VectorTileLayer from '../../../../src/ol/layer/VectorTile.js';
+import VectorTileSource from '../../../../src/ol/source/VectorTile.js';
+import View from '../../../../src/ol/View.js';
+import {Circle, Fill, Stroke, Style} from '../../../../src/ol/style.js';
+import {createXYZ} from '../../../../src/ol/tilegrid.js';
+
+const points = [[0, 0]];
+
+const vectorTileSource = new VectorTileSource({
+  tileGrid: createXYZ({
+    extent: [-20000000, -10000000, 10000000, 20000000],
+    tileSize: 512,
+  }),
+  tileUrlFunction: (tileCoord) => tileCoord,
+  tileLoadFunction(tile, tileCoord) {
+    const features = points.map(
+      (corner) =>
+        new Feature({
+          geometry: new Point(corner),
+          tileCoord,
+        })
+    );
+    tile.setFeatures(features);
+  },
+});
+
+const vectorTileLayer = new VectorTileLayer({
+  declutter: true,
+  source: vectorTileSource,
+  style: new Style({
+    image: new Circle({
+      radius: 100,
+      fill: new Fill({
+        color: 'rgba(255, 0, 0, 0.5)',
+      }),
+      stroke: new Stroke({
+        width: 1,
+        color: 'black',
+      }),
+    }),
+  }),
+});
+
+new Map({
+  target: 'map',
+  layers: [vectorTileLayer],
+  view: new View({
+    center: [0, 0],
+    zoom: 4,
+    multiWorld: true,
+  }),
+});
+
+render({
+  message:
+    'Vector tile source tile grid different from render tile grid, with decluttering',
+});