diff --git a/src/ol/Collection.js b/src/ol/Collection.js
index a4c97d06b3..d57fc2e831 100644
--- a/src/ol/Collection.js
+++ b/src/ol/Collection.js
@@ -17,6 +17,33 @@ const Property = {
 };
 
 
+/**
+ * @classdesc
+ * Events emitted by {@link ol.Collection} instances are instances of this
+ * type.
+ *
+ * @constructor
+ * @extends {ol.events.Event}
+ * @implements {oli.CollectionEvent}
+ * @param {ol.CollectionEventType} type Type.
+ * @param {*=} opt_element Element.
+ */
+export const CollectionEvent = function(type, opt_element) {
+
+  Event.call(this, type);
+
+  /**
+   * The element that is added to or removed from the collection.
+   * @type {*}
+   * @api
+   */
+  this.element = opt_element;
+
+};
+
+inherits(CollectionEvent, Event);
+
+
 /**
  * @typedef {{unique: (boolean|undefined)}}
  */
@@ -33,7 +60,7 @@ export let CollectionOptions;
  *
  * @constructor
  * @extends {ol.Object}
- * @fires ol.Collection.Event
+ * @fires ol.CollectionEvent
  * @param {Array.<T>=} opt_array Array.
  * @param {CollectionOptions=} opt_options Collection options.
  * @param {boolean|undefined} opt_options.unique Disallow the same item from
@@ -162,7 +189,7 @@ Collection.prototype.insertAt = function(index, elem) {
   this.array_.splice(index, 0, elem);
   this.updateLength_();
   this.dispatchEvent(
-    new Collection.Event(CollectionEventType.ADD, elem));
+    new CollectionEvent(CollectionEventType.ADD, elem));
 };
 
 
@@ -222,7 +249,7 @@ Collection.prototype.removeAt = function(index) {
   const prev = this.array_[index];
   this.array_.splice(index, 1);
   this.updateLength_();
-  this.dispatchEvent(new Collection.Event(CollectionEventType.REMOVE, prev));
+  this.dispatchEvent(new CollectionEvent(CollectionEventType.REMOVE, prev));
   return prev;
 };
 
@@ -242,9 +269,9 @@ Collection.prototype.setAt = function(index, elem) {
     const prev = this.array_[index];
     this.array_[index] = elem;
     this.dispatchEvent(
-      new Collection.Event(CollectionEventType.REMOVE, prev));
+      new CollectionEvent(CollectionEventType.REMOVE, prev));
     this.dispatchEvent(
-      new Collection.Event(CollectionEventType.ADD, elem));
+      new CollectionEvent(CollectionEventType.ADD, elem));
   } else {
     let j;
     for (j = n; j < index; ++j) {
@@ -276,29 +303,4 @@ Collection.prototype.assertUnique_ = function(elem, opt_except) {
   }
 };
 
-/**
- * @classdesc
- * Events emitted by {@link ol.Collection} instances are instances of this
- * type.
- *
- * @constructor
- * @extends {ol.events.Event}
- * @implements {oli.Collection.Event}
- * @param {ol.CollectionEventType} type Type.
- * @param {*=} opt_element Element.
- */
-Collection.Event = function(type, opt_element) {
-
-  Event.call(this, type);
-
-  /**
-   * The element that is added to or removed from the collection.
-   * @type {*}
-   * @api
-   */
-  this.element = opt_element;
-
-};
-inherits(Collection.Event, Event);
-
 export default Collection;
diff --git a/src/ol/CollectionEventType.js b/src/ol/CollectionEventType.js
index 1649783d30..a3f93ae83b 100644
--- a/src/ol/CollectionEventType.js
+++ b/src/ol/CollectionEventType.js
@@ -8,13 +8,13 @@
 export default {
   /**
    * Triggered when an item is added to the collection.
-   * @event ol.Collection.Event#add
+   * @event ol.CollectionEvent#add
    * @api
    */
   ADD: 'add',
   /**
    * Triggered when an item is removed from the collection.
-   * @event ol.Collection.Event#remove
+   * @event ol.CollectionEvent#remove
    * @api
    */
   REMOVE: 'remove'
diff --git a/src/ol/PluggableMap.js b/src/ol/PluggableMap.js
index 17394eec2b..5cc9b07e4c 100644
--- a/src/ol/PluggableMap.js
+++ b/src/ol/PluggableMap.js
@@ -18,7 +18,7 @@ import ViewHint from './ViewHint.js';
 import {assert} from './asserts.js';
 import {removeNode} from './dom.js';
 import {listen, unlistenByKey, unlisten} from './events.js';
-import Event from './events/Event.js';
+import {stopPropagation} from './events/Event.js';
 import EventType from './events/EventType.js';
 import {createEmpty, clone, createOrUpdateEmpty, equals, getForViewAndSize, isEmpty} from './extent.js';
 import {TRUE} from './functions.js';
@@ -248,8 +248,7 @@ const PluggableMap = function(options) {
     EventType.WHEEL
   ];
   for (let i = 0, ii = overlayEvents.length; i < ii; ++i) {
-    listen(this.overlayContainerStopEvent_, overlayEvents[i],
-      Event.stopPropagation);
+    listen(this.overlayContainerStopEvent_, overlayEvents[i], stopPropagation);
   }
   this.viewport_.appendChild(this.overlayContainerStopEvent_);
 
@@ -371,7 +370,7 @@ const PluggableMap = function(options) {
 
   listen(this.controls, CollectionEventType.ADD,
     /**
-       * @param {ol.Collection.Event} event Collection event.
+       * @param {ol.CollectionEvent} event CollectionEvent.
        */
     function(event) {
       event.element.setMap(this);
@@ -379,7 +378,7 @@ const PluggableMap = function(options) {
 
   listen(this.controls, CollectionEventType.REMOVE,
     /**
-       * @param {ol.Collection.Event} event Collection event.
+       * @param {ol.CollectionEvent} event CollectionEvent.
        */
     function(event) {
       event.element.setMap(null);
@@ -396,7 +395,7 @@ const PluggableMap = function(options) {
 
   listen(this.interactions, CollectionEventType.ADD,
     /**
-       * @param {ol.Collection.Event} event Collection event.
+       * @param {ol.CollectionEvent} event CollectionEvent.
        */
     function(event) {
       event.element.setMap(this);
@@ -404,7 +403,7 @@ const PluggableMap = function(options) {
 
   listen(this.interactions, CollectionEventType.REMOVE,
     /**
-       * @param {ol.Collection.Event} event Collection event.
+       * @param {ol.CollectionEvent} event CollectionEvent.
        */
     function(event) {
       event.element.setMap(null);
@@ -414,7 +413,7 @@ const PluggableMap = function(options) {
 
   listen(this.overlays_, CollectionEventType.ADD,
     /**
-       * @param {ol.Collection.Event} event Collection event.
+       * @param {ol.CollectionEvent} event CollectionEvent.
        */
     function(event) {
       this.addOverlayInternal_(/** @type {ol.Overlay} */ (event.element));
@@ -422,7 +421,7 @@ const PluggableMap = function(options) {
 
   listen(this.overlays_, CollectionEventType.REMOVE,
     /**
-       * @param {ol.Collection.Event} event Collection event.
+       * @param {ol.CollectionEvent} event CollectionEvent.
        */
     function(event) {
       const overlay = /** @type {ol.Overlay} */ (event.element);
diff --git a/src/ol/control/Attribution.js b/src/ol/control/Attribution.js
index b7b36c823c..a6633d8ba3 100644
--- a/src/ol/control/Attribution.js
+++ b/src/ol/control/Attribution.js
@@ -97,11 +97,9 @@ const Attribution = function(opt_options) {
   element.appendChild(this.ulElement_);
   element.appendChild(button);
 
-  const render = options.render ? options.render : Attribution.render;
-
   Control.call(this, {
     element: element,
-    render: render,
+    render: options.render || render,
     target: options.target
   });
 
@@ -189,9 +187,9 @@ Attribution.prototype.getSourceAttributions_ = function(frameState) {
  * @this {ol.control.Attribution}
  * @api
  */
-Attribution.render = function(mapEvent) {
+export function render(mapEvent) {
   this.updateElement_(mapEvent.frameState);
-};
+}
 
 
 /**
diff --git a/src/ol/control/FullScreen.js b/src/ol/control/FullScreen.js
index 70ed0e3bef..18e40839f7 100644
--- a/src/ol/control/FullScreen.js
+++ b/src/ol/control/FullScreen.js
@@ -80,7 +80,7 @@ const FullScreen = function(opt_options) {
 
   const tipLabel = options.tipLabel ? options.tipLabel : 'Toggle full-screen';
   const button = document.createElement('button');
-  button.className = this.cssClassName_ + '-' + FullScreen.isFullScreen();
+  button.className = this.cssClassName_ + '-' + isFullScreen();
   button.setAttribute('type', 'button');
   button.title = tipLabel;
   button.appendChild(this.labelNode_);
@@ -90,7 +90,7 @@ const FullScreen = function(opt_options) {
 
   const cssClasses = this.cssClassName_ + ' ' + CLASS_UNSELECTABLE +
       ' ' + CLASS_CONTROL + ' ' +
-      (!FullScreen.isFullScreenSupported() ? CLASS_UNSUPPORTED : '');
+      (!isFullScreenSupported() ? CLASS_UNSUPPORTED : '');
   const element = document.createElement('div');
   element.className = cssClasses;
   element.appendChild(button);
@@ -131,15 +131,15 @@ FullScreen.prototype.handleClick_ = function(event) {
  * @private
  */
 FullScreen.prototype.handleFullScreen_ = function() {
-  if (!FullScreen.isFullScreenSupported()) {
+  if (!isFullScreenSupported()) {
     return;
   }
   const map = this.getMap();
   if (!map) {
     return;
   }
-  if (FullScreen.isFullScreen()) {
-    FullScreen.exitFullScreen();
+  if (isFullScreen()) {
+    exitFullScreen();
   } else {
     let element;
     if (this.source_) {
@@ -150,10 +150,10 @@ FullScreen.prototype.handleFullScreen_ = function() {
       element = map.getTargetElement();
     }
     if (this.keys_) {
-      FullScreen.requestFullScreenWithKeys(element);
+      requestFullScreenWithKeys(element);
 
     } else {
-      FullScreen.requestFullScreen(element);
+      requestFullScreen(element);
     }
   }
 };
@@ -165,7 +165,7 @@ FullScreen.prototype.handleFullScreen_ = function() {
 FullScreen.prototype.handleFullScreenChange_ = function() {
   const button = this.element.firstElementChild;
   const map = this.getMap();
-  if (FullScreen.isFullScreen()) {
+  if (isFullScreen()) {
     button.className = this.cssClassName_ + '-true';
     replaceNode(this.labelActiveNode_, this.labelNode_);
   } else {
@@ -195,7 +195,7 @@ FullScreen.prototype.setMap = function(map) {
 /**
  * @return {boolean} Fullscreen is supported by the current platform.
  */
-FullScreen.isFullScreenSupported = function() {
+function isFullScreenSupported() {
   const body = document.body;
   return !!(
     body.webkitRequestFullscreen ||
@@ -203,23 +203,23 @@ FullScreen.isFullScreenSupported = function() {
     (body.msRequestFullscreen && document.msFullscreenEnabled) ||
     (body.requestFullscreen && document.fullscreenEnabled)
   );
-};
+}
 
 /**
  * @return {boolean} Element is currently in fullscreen.
  */
-FullScreen.isFullScreen = function() {
+function isFullScreen() {
   return !!(
     document.webkitIsFullScreen || document.mozFullScreen ||
     document.msFullscreenElement || document.fullscreenElement
   );
-};
+}
 
 /**
  * Request to fullscreen an element.
  * @param {Node} element Element to request fullscreen
  */
-FullScreen.requestFullScreen = function(element) {
+function requestFullScreen(element) {
   if (element.requestFullscreen) {
     element.requestFullscreen();
   } else if (element.msRequestFullscreen) {
@@ -229,26 +229,26 @@ FullScreen.requestFullScreen = function(element) {
   } else if (element.webkitRequestFullscreen) {
     element.webkitRequestFullscreen();
   }
-};
+}
 
 /**
  * Request to fullscreen an element with keyboard input.
  * @param {Node} element Element to request fullscreen
  */
-FullScreen.requestFullScreenWithKeys = function(element) {
+function requestFullScreenWithKeys(element) {
   if (element.mozRequestFullScreenWithKeys) {
     element.mozRequestFullScreenWithKeys();
   } else if (element.webkitRequestFullscreen) {
     element.webkitRequestFullscreen(Element.ALLOW_KEYBOARD_INPUT);
   } else {
-    FullScreen.requestFullScreen(element);
+    requestFullScreen(element);
   }
-};
+}
 
 /**
  * Exit fullscreen.
  */
-FullScreen.exitFullScreen = function() {
+function exitFullScreen() {
   if (document.exitFullscreen) {
     document.exitFullscreen();
   } else if (document.msExitFullscreen) {
@@ -258,6 +258,6 @@ FullScreen.exitFullScreen = function() {
   } else if (document.webkitExitFullscreen) {
     document.webkitExitFullscreen();
   }
-};
+}
 
 export default FullScreen;
diff --git a/src/ol/control/MousePosition.js b/src/ol/control/MousePosition.js
index 4cacf7de63..d7311769f9 100644
--- a/src/ol/control/MousePosition.js
+++ b/src/ol/control/MousePosition.js
@@ -41,12 +41,9 @@ const MousePosition = function(opt_options) {
   const element = document.createElement('DIV');
   element.className = options.className !== undefined ? options.className : 'ol-mouse-position';
 
-  const render = options.render ?
-    options.render : MousePosition.render;
-
   Control.call(this, {
     element: element,
-    render: render,
+    render: options.render || render,
     target: options.target
   });
 
@@ -102,7 +99,7 @@ inherits(MousePosition, Control);
  * @this {ol.control.MousePosition}
  * @api
  */
-MousePosition.render = function(mapEvent) {
+export function render(mapEvent) {
   const frameState = mapEvent.frameState;
   if (!frameState) {
     this.mapProjection_ = null;
@@ -113,7 +110,7 @@ MousePosition.render = function(mapEvent) {
     }
   }
   this.updateHTML_(this.lastMouseMovePixel_);
-};
+}
 
 
 /**
diff --git a/src/ol/control/OverviewMap.js b/src/ol/control/OverviewMap.js
index a0042c2064..e052e0d6bb 100644
--- a/src/ol/control/OverviewMap.js
+++ b/src/ol/control/OverviewMap.js
@@ -157,11 +157,9 @@ const OverviewMap = function(opt_options) {
   element.appendChild(this.ovmapDiv_);
   element.appendChild(button);
 
-  const render = options.render ? options.render : OverviewMap.render;
-
   Control.call(this, {
     element: element,
-    render: render,
+    render: options.render || render,
     target: options.target
   });
 
@@ -306,10 +304,10 @@ OverviewMap.prototype.handleRotationChanged_ = function() {
  * @this {ol.control.OverviewMap}
  * @api
  */
-OverviewMap.render = function(mapEvent) {
+export function render(mapEvent) {
   this.validateExtent_();
   this.updateBox_();
-};
+}
 
 
 /**
diff --git a/src/ol/control/Rotate.js b/src/ol/control/Rotate.js
index bb702b2748..328d388902 100644
--- a/src/ol/control/Rotate.js
+++ b/src/ol/control/Rotate.js
@@ -59,13 +59,11 @@ const Rotate = function(opt_options) {
   element.className = cssClasses;
   element.appendChild(button);
 
-  const render = options.render ? options.render : Rotate.render;
-
   this.callResetNorth_ = options.resetNorth ? options.resetNorth : undefined;
 
   Control.call(this, {
     element: element,
-    render: render,
+    render: options.render || render,
     target: options.target
   });
 
@@ -141,7 +139,7 @@ Rotate.prototype.resetNorth_ = function() {
  * @this {ol.control.Rotate}
  * @api
  */
-Rotate.render = function(mapEvent) {
+export function render(mapEvent) {
   const frameState = mapEvent.frameState;
   if (!frameState) {
     return;
@@ -162,5 +160,6 @@ Rotate.render = function(mapEvent) {
     this.label_.style.transform = transform;
   }
   this.rotation_ = rotation;
-};
+}
+
 export default Rotate;
diff --git a/src/ol/control/ScaleLine.js b/src/ol/control/ScaleLine.js
index 404c431b57..00091a8eb0 100644
--- a/src/ol/control/ScaleLine.js
+++ b/src/ol/control/ScaleLine.js
@@ -91,11 +91,9 @@ const ScaleLine = function(opt_options) {
    */
   this.renderedHTML_ = '';
 
-  const render = options.render ? options.render : ScaleLine.render;
-
   Control.call(this, {
     element: this.element_,
-    render: render,
+    render: options.render || render,
     target: options.target
   });
 
@@ -129,7 +127,7 @@ ScaleLine.prototype.getUnits = function() {
  * @this {ol.control.ScaleLine}
  * @api
  */
-ScaleLine.render = function(mapEvent) {
+export function render(mapEvent) {
   const frameState = mapEvent.frameState;
   if (!frameState) {
     this.viewState_ = null;
@@ -137,7 +135,7 @@ ScaleLine.render = function(mapEvent) {
     this.viewState_ = frameState.viewState;
   }
   this.updateElement_();
-};
+}
 
 
 /**
diff --git a/src/ol/control/ZoomSlider.js b/src/ol/control/ZoomSlider.js
index 26556cceaa..b5b2ff460e 100644
--- a/src/ol/control/ZoomSlider.js
+++ b/src/ol/control/ZoomSlider.js
@@ -7,7 +7,7 @@ import Control from '../control/Control.js';
 import {CLASS_CONTROL, CLASS_UNSELECTABLE} from '../css.js';
 import {easeOut} from '../easing.js';
 import {listen} from '../events.js';
-import Event from '../events/Event.js';
+import {stopPropagation} from '../events/Event.js';
 import EventType from '../events/EventType.js';
 import {clamp} from '../math.js';
 import PointerEventType from '../pointer/EventType.js';
@@ -130,16 +130,12 @@ const ZoomSlider = function(opt_options) {
   listen(this.dragger_, PointerEventType.POINTERUP,
     this.handleDraggerEnd_, this);
 
-  listen(containerElement, EventType.CLICK,
-    this.handleContainerClick_, this);
-  listen(thumbElement, EventType.CLICK,
-    Event.stopPropagation);
-
-  const render = options.render ? options.render : ZoomSlider.render;
+  listen(containerElement, EventType.CLICK, this.handleContainerClick_, this);
+  listen(thumbElement, EventType.CLICK, stopPropagation);
 
   Control.call(this, {
     element: containerElement,
-    render: render
+    render: options.render || render
   });
 };
 
@@ -206,7 +202,7 @@ ZoomSlider.prototype.initSlider_ = function() {
  * @this {ol.control.ZoomSlider}
  * @api
  */
-ZoomSlider.render = function(mapEvent) {
+export function render(mapEvent) {
   if (!mapEvent.frameState) {
     return;
   }
@@ -218,7 +214,7 @@ ZoomSlider.render = function(mapEvent) {
     this.currentResolution_ = res;
     this.setThumbPosition_(res);
   }
-};
+}
 
 
 /**
diff --git a/src/ol/events/Event.js b/src/ol/events/Event.js
index 8756c1bca7..d998e624d1 100644
--- a/src/ol/events/Event.js
+++ b/src/ol/events/Event.js
@@ -61,15 +61,16 @@ Event.prototype.preventDefault =
 /**
  * @param {Event|ol.events.Event} evt Event
  */
-Event.stopPropagation = function(evt) {
+export function stopPropagation(evt) {
   evt.stopPropagation();
-};
+}
 
 
 /**
  * @param {Event|ol.events.Event} evt Event
  */
-Event.preventDefault = function(evt) {
+export function preventDefault(evt) {
   evt.preventDefault();
-};
+}
+
 export default Event;
diff --git a/src/ol/interaction/Modify.js b/src/ol/interaction/Modify.js
index d58c416b8c..e01300603e 100644
--- a/src/ol/interaction/Modify.js
+++ b/src/ol/interaction/Modify.js
@@ -355,7 +355,7 @@ Modify.prototype.handleSourceRemove_ = function(event) {
 
 
 /**
- * @param {ol.Collection.Event} evt Event.
+ * @param {ol.CollectionEvent} evt Event.
  * @private
  */
 Modify.prototype.handleFeatureAdd_ = function(evt) {
@@ -377,7 +377,7 @@ Modify.prototype.handleFeatureChange_ = function(evt) {
 
 
 /**
- * @param {ol.Collection.Event} evt Event.
+ * @param {ol.CollectionEvent} evt Event.
  * @private
  */
 Modify.prototype.handleFeatureRemove_ = function(evt) {
diff --git a/src/ol/interaction/Select.js b/src/ol/interaction/Select.js
index 593d4f3a7e..df425c54de 100644
--- a/src/ol/interaction/Select.js
+++ b/src/ol/interaction/Select.js
@@ -349,7 +349,7 @@ Select.getDefaultStyleFunction = function() {
 
 
 /**
- * @param {ol.Collection.Event} evt Event.
+ * @param {ol.CollectionEvent} evt Event.
  * @private
  */
 Select.prototype.addFeature_ = function(evt) {
@@ -361,7 +361,7 @@ Select.prototype.addFeature_ = function(evt) {
 
 
 /**
- * @param {ol.Collection.Event} evt Event.
+ * @param {ol.CollectionEvent} evt Event.
  * @private
  */
 Select.prototype.removeFeature_ = function(evt) {
diff --git a/src/ol/interaction/Snap.js b/src/ol/interaction/Snap.js
index 6c5fdf6663..0aaca4e09d 100644
--- a/src/ol/interaction/Snap.js
+++ b/src/ol/interaction/Snap.js
@@ -2,7 +2,7 @@
  * @module ol/interaction/Snap
  */
 import {getUid, inherits} from '../index.js';
-import Collection from '../Collection.js';
+import {CollectionEvent} from '../Collection.js';
 import CollectionEventType from '../CollectionEventType.js';
 import {distance as coordinateDistance, squaredDistance as squaredCoordinateDistance, closestOnCircle, closestOnSegment, squaredDistanceToSegment} from '../coordinate.js';
 import {listen, unlistenByKey} from '../events.js';
@@ -214,14 +214,14 @@ Snap.prototype.getFeatures_ = function() {
 
 
 /**
- * @param {ol.source.Vector.Event|ol.Collection.Event} evt Event.
+ * @param {ol.source.Vector.Event|ol.CollectionEvent} evt Event.
  * @private
  */
 Snap.prototype.handleFeatureAdd_ = function(evt) {
   let feature;
   if (evt instanceof VectorSource.Event) {
     feature = evt.feature;
-  } else if (evt instanceof Collection.Event) {
+  } else if (evt instanceof CollectionEvent) {
     feature = evt.element;
   }
   this.addFeature(/** @type {ol.Feature} */ (feature));
@@ -229,14 +229,14 @@ Snap.prototype.handleFeatureAdd_ = function(evt) {
 
 
 /**
- * @param {ol.source.Vector.Event|ol.Collection.Event} evt Event.
+ * @param {ol.source.Vector.Event|ol.CollectionEvent} evt Event.
  * @private
  */
 Snap.prototype.handleFeatureRemove_ = function(evt) {
   let feature;
   if (evt instanceof VectorSource.Event) {
     feature = evt.feature;
-  } else if (evt instanceof Collection.Event) {
+  } else if (evt instanceof CollectionEvent) {
     feature = evt.element;
   }
   this.removeFeature(/** @type {ol.Feature} */ (feature));
diff --git a/src/ol/layer/Group.js b/src/ol/layer/Group.js
index a986ee894c..3a4c516e53 100644
--- a/src/ol/layer/Group.js
+++ b/src/ol/layer/Group.js
@@ -121,7 +121,7 @@ LayerGroup.prototype.handleLayersChanged_ = function(event) {
 
 
 /**
- * @param {ol.Collection.Event} collectionEvent Collection event.
+ * @param {ol.CollectionEvent} collectionEvent CollectionEvent.
  * @private
  */
 LayerGroup.prototype.handleLayersAdd_ = function(collectionEvent) {
@@ -136,7 +136,7 @@ LayerGroup.prototype.handleLayersAdd_ = function(collectionEvent) {
 
 
 /**
- * @param {ol.Collection.Event} collectionEvent Collection event.
+ * @param {ol.CollectionEvent} collectionEvent CollectionEvent.
  * @private
  */
 LayerGroup.prototype.handleLayersRemove_ = function(collectionEvent) {
diff --git a/test/spec/ol/control/scaleline.test.js b/test/spec/ol/control/scaleline.test.js
index f8396f2eb9..5ae93b2f44 100644
--- a/test/spec/ol/control/scaleline.test.js
+++ b/test/spec/ol/control/scaleline.test.js
@@ -1,6 +1,6 @@
 import Map from '../../../../src/ol/Map.js';
 import View from '../../../../src/ol/View.js';
-import ScaleLine from '../../../../src/ol/control/ScaleLine.js';
+import ScaleLine, {render} from '../../../../src/ol/control/ScaleLine.js';
 import {fromLonLat} from '../../../../src/ol/proj.js';
 import Projection from '../../../../src/ol/proj/Projection.js';
 
@@ -67,12 +67,10 @@ describe('ol.control.ScaleLine', function() {
     describe('render', function() {
       it('defaults to `ol.control.ScaleLine.render`', function() {
         const ctrl = new ScaleLine();
-        expect(ctrl.render).to.be(ScaleLine.render);
+        expect(ctrl.render).to.be(render);
       });
       it('can be configured', function() {
-        const myRender = function() {
-
-        };
+        const myRender = function() {};
         const ctrl = new ScaleLine({
           render: myRender
         });
diff --git a/test/spec/ol/events/event.test.js b/test/spec/ol/events/event.test.js
index 7ac8974fe3..c308dedb88 100644
--- a/test/spec/ol/events/event.test.js
+++ b/test/spec/ol/events/event.test.js
@@ -1,4 +1,4 @@
-import Event from '../../../../src/ol/events/Event.js';
+import Event, {preventDefault, stopPropagation} from '../../../../src/ol/events/Event.js';
 
 describe('ol.events.Event', function() {
 
@@ -30,7 +30,7 @@ describe('ol.events.Event', function() {
       const event = {
         preventDefault: sinon.spy()
       };
-      Event.preventDefault(event);
+      preventDefault(event);
       expect(event.preventDefault.called).to.be(true);
     });
   });
@@ -40,7 +40,7 @@ describe('ol.events.Event', function() {
       const event = {
         stopPropagation: sinon.spy()
       };
-      Event.stopPropagation(event);
+      stopPropagation(event);
       expect(event.stopPropagation.called).to.be(true);
     });
   });