Organize tests

test/rendering/cases/linestring-style/main.js

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+import Feature from '../../../../src/ol/Feature.js';
+import LineString from '../../../../src/ol/geom/LineString.js';
+import Map from '../../../../src/ol/Map.js';
+import Stroke from '../../../../src/ol/style/Stroke.js';
+import Style from '../../../../src/ol/style/Style.js';
+import VectorLayer from '../../../../src/ol/layer/Vector.js';
+import VectorSource from '../../../../src/ol/source/Vector.js';
+import View from '../../../../src/ol/View.js';
+
+const vectorSource = new VectorSource();
+let feature;
+
+feature = new Feature({
+  geometry: new LineString([
+    [-60, 60],
+    [45, 60],
+  ]),
+});
+vectorSource.addFeature(feature);
+
+feature = new Feature({
+  geometry: new LineString([
+    [-60, -50],
+    [30, 10],
+  ]),
+});
+feature.setStyle(
+  new Style({
+    stroke: new Stroke({color: '#f00', width: 3}),
+  })
+);
+vectorSource.addFeature(feature);
+
+feature = new Feature({
+  geometry: new LineString([
+    [-110, -100],
+    [0, 100],
+    [100, -90],
+  ]),
+});
+feature.setStyle(
+  new Style({
+    stroke: new Stroke({
+      color: 'rgba(55, 55, 55, 0.75)',
+      width: 5,
+      lineCap: 'square',
+      lineDash: [4, 8],
+      lineJoin: 'round',
+    }),
+  })
+);
+vectorSource.addFeature(feature);
+
+feature = new Feature({
+  geometry: new LineString([
+    [-80, 80],
+    [80, 80],
+    [-40, -90],
+  ]),
+});
+feature.setStyle([
+  new Style({
+    stroke: new Stroke({color: '#F2F211', width: 5}),
+  }),
+  new Style({
+    stroke: new Stroke({color: '#292921', width: 1}),
+  }),
+]);
+vectorSource.addFeature(feature);
+
+new Map({
+  pixelRatio: 1,
+  layers: [
+    new VectorLayer({
+      source: vectorSource,
+    }),
+  ],
+  target: 'map',
+  view: new View({
+    center: [0, 0],
+    resolution: 1,
+  }),
+});
+
+render();