Add tests for ol.style.IconImageCache

src/ol/style/iconstyle.js

@@ -437,6 +437,15 @@ ol.style.IconImageCache.getKey = function(src, crossOrigin) {
 };
 
 
+/**
+ * FIXME empty description for jsdoc
+ */
+ol.style.IconImageCache.prototype.clear = function() {
+  this.cache_ = {};
+  this.cacheSize_ = 0;
+};
+
+
 /**
  * FIXME empty description for jsdoc
  */

test/spec/ol/style/iconstyle.test.js

@@ -0,0 +1,71 @@
+goog.provide('ol.test.style.IconImageCache');
+
+describe('ol.style.IconImageCache', function() {
+  var originalMaxCacheSize;
+
+  beforeEach(function() {
+    var cache = ol.style.IconImageCache.getInstance();
+    cache.clear();
+    originalMaxCacheSize = cache.maxCacheSize;
+    cache.maxCacheSize_ = 4;
+  });
+
+  afterEach(function() {
+    var cache = ol.style.IconImageCache.getInstance();
+    cache.maxCacheSize_ = originalMaxCacheSize;
+    cache.clear();
+  });
+
+  describe('#expire', function() {
+    it('expires images when expected', function() {
+      var cache = ol.style.IconImageCache.getInstance();
+
+      var i, src, iconImage, key;
+
+      for (i = 0; i < 4; ++i) {
+        src = i + '';
+        iconImage = new ol.style.IconImage_(src, null);
+        cache.set(src, null, iconImage);
+      }
+
+      expect(cache.cacheSize_).to.eql(4);
+
+      cache.expire();
+      expect(cache.cacheSize_).to.eql(4);
+
+      src = '4';
+      iconImage = new ol.style.IconImage_(src, null);
+      cache.set(src, null, iconImage);
+      expect(cache.cacheSize_).to.eql(5);
+
+      cache.expire(); // remove '0' and '4'
+      expect(cache.cacheSize_).to.eql(3);
+
+      src = '0';
+      iconImage = new ol.style.IconImage_(src, null);
+      goog.events.listen(iconImage, goog.events.EventType.CHANGE,
+          goog.nullFunction, false);
+      cache.set(src, null, iconImage);
+      expect(cache.cacheSize_).to.eql(4);
+
+      src = '4';
+      iconImage = new ol.style.IconImage_(src, null);
+      goog.events.listen(iconImage, goog.events.EventType.CHANGE,
+          goog.nullFunction, false);
+      cache.set(src, null, iconImage);
+      expect(cache.cacheSize_).to.eql(5);
+
+      // check that '0' and '4' are not removed from the cache
+      cache.expire();
+      key = ol.style.IconImageCache.getKey('0', null);
+      expect(key in cache.cache_).to.be.ok();
+      key = ol.style.IconImageCache.getKey('4', null);
+      expect(key in cache.cache_).to.be.ok();
+
+    });
+  });
+});
+
+goog.require('goog.events');
+goog.require('goog.events.EventType');
+goog.require('ol.style.IconImageCache');