Organize tests

test/rendering/cases/reproj-tile-dateline-merc/main.js

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+import Map from '../../../../src/ol/Map.js';
+import TileLayer from '../../../../src/ol/layer/Tile.js';
+import View from '../../../../src/ol/View.js';
+import XYZ from '../../../../src/ol/source/XYZ.js';
+import proj4 from 'proj4';
+import {get, transform} from '../../../../src/ol/proj.js';
+import {register} from '../../../../src/ol/proj/proj4.js';
+
+proj4.defs('merc_180', '+proj=merc +lon_0=180 +units=m +no_defs');
+
+register(proj4);
+const merc = get('merc_180');
+merc.setExtent([-20026376.39, -20048966.1, 20026376.39, 20048966.1]);
+
+const center4326 = [180, 0];
+const center = transform(center4326, 'EPSG:4326', 'merc_180');
+
+const source = new XYZ({
+  projection: 'EPSG:4326',
+  minZoom: 0,
+  maxZoom: 0,
+  url: '/data/tiles/4326/{z}/{x}/{y}.png',
+});
+
+new Map({
+  pixelRatio: 1,
+  target: 'map',
+  layers: [
+    new TileLayer({
+      source: source,
+    }),
+  ],
+  view: new View({
+    projection: 'merc_180',
+    center: center,
+    zoom: 0,
+  }),
+});
+
+render();