Organize tests

test/browser/spec/ol/layer/tile.test.js

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+import TileLayer from '../../../../../src/ol/layer/Tile.js';
+import {Map, View} from '../../../../../src/ol/index.js';
+import {OSM, XYZ} from '../../../../../src/ol/source.js';
+
+describe('ol.layer.Tile', function () {
+  describe('constructor (defaults)', function () {
+    let layer;
+
+    beforeEach(function () {
+      layer = new TileLayer({
+        source: new OSM(),
+      });
+    });
+
+    afterEach(function () {
+      layer.dispose();
+    });
+
+    it('creates an instance', function () {
+      expect(layer).to.be.a(TileLayer);
+    });
+
+    it('provides default preload', function () {
+      expect(layer.getPreload()).to.be(0);
+    });
+
+    it('provides default useInterimTilesOnError', function () {
+      expect(layer.getUseInterimTilesOnError()).to.be(true);
+    });
+  });
+
+  describe('frameState.animate after tile transition with layer opacity', function () {
+    let target, map;
+
+    beforeEach(function (done) {
+      target = document.createElement('div');
+      Object.assign(target.style, {
+        position: 'absolute',
+        left: '-1000px',
+        top: '-1000px',
+        width: '256px',
+        height: '256px',
+      });
+      document.body.appendChild(target);
+
+      map = new Map({
+        target: target,
+        view: new View({center: [0, 0], zoom: 1}),
+      });
+
+      map.once('rendercomplete', function () {
+        done();
+      });
+    });
+
+    afterEach(function () {
+      map.dispose();
+      document.body.removeChild(target);
+    });
+
+    it('sets frameState.animate to false when opacity is 1', function (done) {
+      let lastFrameState;
+      const layer = new TileLayer({
+        opacity: 1,
+        source: new XYZ({
+          url: 'spec/ol/data/osm-0-0-0.png',
+        }),
+      });
+      layer.on('postrender', function (event) {
+        lastFrameState = event.frameState;
+      });
+
+      map.once('rendercomplete', function () {
+        expect(lastFrameState.animate).to.be(false);
+        done();
+      });
+
+      map.addLayer(layer);
+    });
+
+    it('sets frameState.animate to false when opacity is 0.5', function (done) {
+      let lastFrameState;
+      const layer = new TileLayer({
+        opacity: 0.5,
+        source: new XYZ({
+          url: 'spec/ol/data/osm-0-0-0.png',
+        }),
+      });
+      layer.on('postrender', function (event) {
+        lastFrameState = event.frameState;
+      });
+
+      map.once('rendercomplete', function () {
+        expect(lastFrameState.animate).to.be(false);
+        done();
+      });
+
+      map.addLayer(layer);
+    });
+  });
+});