Replaces reproj image.tests.js and tile.tests.js

Transforms the old rendering tests for
ReprojImage and ReprojTile to the new
rendering test approach.

rendering/cases/reproj-tile-northpole/main.js

@@ -0,0 +1,40 @@
+import Map from '../../../src/ol/Map.js';
+import View from '../../../src/ol/View.js';
+import XYZ from '../../../src/ol/source/XYZ.js';
+import TileLayer from '../../../src/ol/layer/Tile.js';
+import {get, transform} from '../../../src/ol/proj.js';
+import {register} from '../../../src/ol/proj/proj4.js';
+import proj4 from 'proj4';
+
+proj4.defs('EPSG:3413', '+proj=stere +lat_0=90 +lat_ts=70 +lon_0=-45 ' +
+          '+k=1 +x_0=0 +y_0=0 +datum=WGS84 +units=m +no_defs');
+
+register(proj4);
+const proj3413 = get('EPSG:3413');
+proj3413.setExtent([-4194304, -4194304, 4194304, 4194304]);
+
+const center4326 = [0, 90];
+const center = transform(center4326, 'EPSG:4326', 'EPSG:3413');
+
+const source = new XYZ({
+  maxZoom: 0,
+  projection: 'EPSG:4326',
+  url: '/data/tiles/4326/{z}/{x}/{y}.png'
+});
+
+new Map({
+  pixelRatio: 1,
+  target: 'map',
+  layers: [
+    new TileLayer({
+      source: source
+    })
+  ],
+  view: new View({
+    projection: 'EPSG:3413',
+    center: center,
+    zoom: 0
+  })
+});
+
+render();