Organize tests

test/rendering/cases/immediate-geographic/main.js

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+import TileLayer from '../../../../src/ol/layer/Tile.js';
+import XYZ from '../../../../src/ol/source/XYZ.js';
+import {Circle, Fill, Style} from '../../../../src/ol/style.js';
+import {Map, View} from '../../../../src/ol/index.js';
+import {Point} from '../../../../src/ol/geom.js';
+import {getVectorContext} from '../../../../src/ol/render.js';
+import {useGeographic} from '../../../../src/ol/proj.js';
+
+useGeographic();
+
+const center = [8.6, 50.1];
+
+const layer = new TileLayer({
+  source: new XYZ({
+    url: '/data/tiles/satellite/{z}/{x}/{y}.jpg',
+    transition: 0,
+  }),
+});
+
+layer.on('postrender', (event) => {
+  const context = getVectorContext(event);
+  context.setStyle(
+    new Style({
+      image: new Circle({
+        radius: 5,
+        fill: new Fill({color: 'red'}),
+      }),
+    })
+  );
+  context.drawGeometry(new Point(center));
+});
+
+new Map({
+  target: 'map',
+  layers: [layer],
+  view: new View({
+    center: center,
+    zoom: 3,
+  }),
+});
+
+render();