Replaces vector.tests.js with new tests

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

rendering/cases/layer-vector-polygon-partial/main.js

@@ -0,0 +1,54 @@
+import Map from '../../../src/ol/Map.js';
+import View from '../../../src/ol/View.js';
+import VectorLayer from '../../../src/ol/layer/Vector.js';
+import VectorSource from '../../../src/ol/source/Vector.js';
+import Feature from '../../../src/ol/Feature.js';
+import Polygon from '../../../src/ol/geom/Polygon.js';
+import Style from '../../../src/ol/style/Style.js';
+import Stroke from '../../../src/ol/style/Stroke.js';
+import Fill from '../../../src/ol/style/Fill.js';
+
+const src = new VectorSource({
+  features: [
+    new Feature(new Polygon([[
+      [-22, 18],
+      [-22, 78],
+      [-9, 78],
+      [-9, 18],
+      [-22, 18]
+    ]])),
+    new Feature(new Polygon([[
+      [-9, 18],
+      [-9, 78],
+      [4, 78],
+      [4, 18],
+      [-9, 18]
+    ]]))
+  ]
+});
+const layer = new VectorLayer({
+  renderBuffer: 0,
+  source: src,
+  style: new Style({
+    stroke: new Stroke({
+      color: [0, 0, 0, 1],
+      width: 2
+    }),
+    fill: new Fill({
+      color: [255, 0, 0, 1]
+    })
+  })
+});
+const view = new View({
+  center: [-9.5, 78],
+  zoom: 2,
+  projection: 'EPSG:4326'
+});
+new Map({
+  pixelRatio: 1,
+  layers: [layer],
+  target: 'map',
+  view: view
+});
+
+render();