Organize tests

test/browser/spec/ol/tilecache.test.js

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+import Tile from '../../../../src/ol/Tile.js';
+import TileCache from '../../../../src/ol/TileCache.js';
+import {getKey} from '../../../../src/ol/tilecoord.js';
+
+describe('ol.TileCache', function () {
+  describe('#pruneExceptNewestZ()', function () {
+    it('gets rid of all entries that are not at the newest z', function () {
+      const tiles = [
+        new Tile([0, 0, 0]),
+        new Tile([1, 0, 0]),
+        new Tile([1, 1, 0]),
+        new Tile([2, 0, 0]),
+        new Tile([2, 1, 0]),
+        new Tile([2, 2, 0]),
+        new Tile([2, 3, 0]), // newest tile at z: 2
+      ];
+      const cache = new TileCache();
+
+      sinon.spy(tiles[0], 'dispose');
+
+      tiles.forEach(function (tile) {
+        cache.set(getKey(tile.tileCoord), tile);
+      });
+
+      cache.pruneExceptNewestZ();
+
+      expect(cache.getKeys()).to.eql(['2/3/0', '2/2/0', '2/1/0', '2/0/0']);
+    });
+  });
+});