Organize tests

test/browser/spec/ol/style/iconimagecache.test.js

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+import IconImage from '../../../../../src/ol/style/IconImage.js';
+import {VOID} from '../../../../../src/ol/functions.js';
+import {shared as iconImageCache} from '../../../../../src/ol/style/IconImageCache.js';
+import {listen} from '../../../../../src/ol/events.js';
+
+describe('ol.style.IconImageCache', function () {
+  let originalMaxCacheSize;
+
+  beforeEach(function () {
+    iconImageCache.clear();
+    originalMaxCacheSize = iconImageCache.maxCacheSize;
+    iconImageCache.maxCacheSize_ = 4;
+  });
+
+  afterEach(function () {
+    iconImageCache.maxCacheSize_ = originalMaxCacheSize;
+    iconImageCache.clear();
+  });
+
+  describe('#expire', function () {
+    it('expires images when expected', function () {
+      let i, src, iconImage;
+
+      for (i = 0; i < 4; ++i) {
+        src = i + '';
+        iconImage = new IconImage(null, src);
+        iconImageCache.set(src, null, null, iconImage);
+      }
+
+      expect(iconImageCache.cacheSize_).to.eql(4);
+
+      iconImageCache.expire();
+      expect(iconImageCache.cacheSize_).to.eql(4);
+
+      src = '4';
+      iconImage = new IconImage(null, src);
+      iconImageCache.set(src, null, null, iconImage);
+      expect(iconImageCache.cacheSize_).to.eql(5);
+
+      iconImageCache.expire(); // remove '0' and '4'
+      expect(iconImageCache.cacheSize_).to.eql(3);
+
+      src = '0';
+      iconImage = new IconImage(null, src);
+      listen(iconImage, 'change', VOID, false);
+      iconImageCache.set(src, null, null, iconImage);
+      expect(iconImageCache.cacheSize_).to.eql(4);
+
+      src = '4';
+      iconImage = new IconImage(null, src);
+      listen(iconImage, 'change', VOID, false);
+      iconImageCache.set(src, null, null, iconImage);
+      expect(iconImageCache.cacheSize_).to.eql(5);
+
+      // check that '0' and '4' are not removed from the cache
+      iconImageCache.expire();
+      expect(iconImageCache.get('0', null, null)).to.not.be(null);
+      expect(iconImageCache.get('4', null, null)).to.not.be(null);
+    });
+  });
+
+  describe('#setSize', function () {
+    it('sets max cache size and expires cache', function () {
+      let i, src, iconImage;
+
+      for (i = 0; i < 3; ++i) {
+        src = i + '';
+        iconImage = new IconImage(null, src);
+        iconImageCache.set(src, null, null, iconImage);
+      }
+
+      expect(iconImageCache.cacheSize_).to.eql(3);
+
+      iconImageCache.setSize(2);
+
+      expect(iconImageCache.maxCacheSize_).to.eql(2);
+      expect(iconImageCache.cacheSize_).to.eql(2);
+    });
+  });
+});