Organize tests

test/rendering/cases/circle-style/main.js

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+import Circle from '../../../../src/ol/style/Circle.js';
+import Feature from '../../../../src/ol/Feature.js';
+import Map from '../../../../src/ol/Map.js';
+import Point from '../../../../src/ol/geom/Point.js';
+import Stroke from '../../../../src/ol/style/Stroke.js';
+import Style from '../../../../src/ol/style/Style.js';
+import VectorLayer from '../../../../src/ol/layer/Vector.js';
+import VectorSource from '../../../../src/ol/source/Vector.js';
+import View from '../../../../src/ol/View.js';
+
+const ellipse = new Feature(new Point([-50, -50]));
+
+ellipse.setStyle(
+  new Style({
+    image: new Circle({
+      radius: 30,
+      scale: [1, 0.5],
+      stroke: new Stroke({
+        color: '#00f',
+        width: 3,
+      }),
+    }),
+  })
+);
+
+const vectorSource = new VectorSource();
+
+vectorSource.addFeatures([
+  new Feature({
+    geometry: new Point([-50, 50]),
+    radius: 10,
+  }),
+  new Feature({
+    geometry: new Point([50, -50]),
+    radius: 20,
+  }),
+  new Feature({
+    geometry: new Point([50, 50]),
+    radius: 30,
+  }),
+  ellipse,
+]);
+
+const style = new Style({
+  image: new Circle({
+    radius: 1,
+    stroke: new Stroke({
+      color: '#00f',
+      width: 3,
+    }),
+  }),
+});
+
+new Map({
+  pixelRatio: 2,
+  layers: [
+    new VectorLayer({
+      source: vectorSource,
+      style: function (feature) {
+        style.getImage().setRadius(feature.get('radius'));
+        return style;
+      },
+    }),
+  ],
+  target: 'map',
+  view: new View({
+    center: [0, 0],
+    resolution: 1,
+  }),
+});
+
+render();