Avoid firing duplicate change events in ol.layer.Layer

test/spec/ol/layer/layer.test.js

@@ -210,6 +210,13 @@ describe('ol.layer.Layer', function() {
       expect(layer.getBrightness()).to.be(-0.7);
     });
 
+    it('triggers a change event', function() {
+      var listener = sinon.spy();
+      layer.on(ol.ObjectEventType.CHANGE, listener);
+      layer.setBrightness(0.5);
+      expect(listener.calledOnce).to.be(true);
+    });
+
   });
 
   describe('#setContrast', function() {
@@ -238,6 +245,13 @@ describe('ol.layer.Layer', function() {
       expect(layer.getContrast()).to.be(42);
     });
 
+    it('triggers a change event', function() {
+      var listener = sinon.spy();
+      layer.on(ol.ObjectEventType.CHANGE, listener);
+      layer.setContrast(43);
+      expect(listener.calledOnce).to.be(true);
+    });
+
   });
 
 
@@ -277,6 +291,13 @@ describe('ol.layer.Layer', function() {
       expect(layer.getHue()).to.be(-100);
     });
 
+    it('triggers a change event', function() {
+      var listener = sinon.spy();
+      layer.on(ol.ObjectEventType.CHANGE, listener);
+      layer.setHue(0.5);
+      expect(listener.calledOnce).to.be(true);
+    });
+
   });
 
 
@@ -301,6 +322,13 @@ describe('ol.layer.Layer', function() {
       expect(layer.getOpacity()).to.be(0.3);
     });
 
+    it('triggers a change event', function() {
+      var listener = sinon.spy();
+      layer.on(ol.ObjectEventType.CHANGE, listener);
+      layer.setOpacity(0.4);
+      expect(listener.calledOnce).to.be(true);
+    });
+
   });
 
 
@@ -330,6 +358,13 @@ describe('ol.layer.Layer', function() {
       expect(layer.getSaturation()).to.be(42);
     });
 
+    it('triggers a change event', function() {
+      var listener = sinon.spy();
+      layer.on(ol.ObjectEventType.CHANGE, listener);
+      layer.setSaturation(42);
+      expect(listener.calledOnce).to.be(true);
+    });
+
   });
 
 
@@ -356,6 +391,7 @@ describe('ol.layer.Layer', function() {
 });
 
 goog.require('goog.dispose');
+goog.require('ol.ObjectEventType');
 goog.require('ol.layer.Layer');
 goog.require('ol.proj');
 goog.require('ol.source.Source');