Replaces image.tests.js with new tests

Transforms the old rendering tests for the ImageLayer
to the new rendering test approach.

rendering/cases/layer-image/main.js

@@ -0,0 +1,28 @@
+import Map from '../../../src/ol/Map.js';
+import View from '../../../src/ol/View.js';
+import Static from '../../../src/ol/source/ImageStatic.js';
+import {
+  get as getProjection,
+  transform,
+  transformExtent
+} from '../../../src/ol/proj';
+import ImageLayer from '../../../src/ol/layer/Image.js';
+const center = transform([-122.416667, 37.783333], 'EPSG:4326', 'EPSG:3857');
+
+new Map({
+  pixelRatio: 1,
+  target: 'map',
+  layers: [new ImageLayer({
+    source: new Static({
+      url: '/data/tiles/osm/5/5/12.png',
+      imageExtent: transformExtent([-123, 37, -122, 38], 'EPSG:4326', 'EPSG:3857'),
+      projection: getProjection('EPSG:3857')
+    })
+  })],
+  view: new View({
+    center,
+    zoom: 8
+  })
+});
+
+render();