Organize tests

test/rendering/cases/source-raster/main.js

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+import ImageLayer from '../../../../src/ol/layer/Image.js';
+import Map from '../../../../src/ol/Map.js';
+import RasterSource from '../../../../src/ol/source/Raster.js';
+import View from '../../../../src/ol/View.js';
+import XYZ from '../../../../src/ol/source/XYZ.js';
+
+const raster = new RasterSource({
+  sources: [
+    new XYZ({
+      url: '/data/tiles/osm/{z}/{x}/{y}.png',
+      transition: 0,
+    }),
+  ],
+  threads: 0, // Avoid using workers to work with puppeteer
+  operation: function (pixels) {
+    const pixel = pixels[0];
+    const red = pixel[0];
+    pixel[0] = pixel[2];
+    pixel[2] = red;
+    return pixel;
+  },
+});
+
+new Map({
+  layers: [new ImageLayer({source: raster})],
+  target: 'map',
+  view: new View({
+    center: [0, 0],
+    zoom: 0,
+  }),
+});
+
+render();