From 314b04df7ab29cd68d34fba66289427d3f18bc81 Mon Sep 17 00:00:00 2001
From: geonux <gaudissart@gmail.com>
Date: Mon, 6 Jul 2015 13:49:42 +0200
Subject: [PATCH] Add assertions to pass the validation step.

---
 src/ol/interaction/drawinteraction.js | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/ol/interaction/drawinteraction.js b/src/ol/interaction/drawinteraction.js
index 7c1729feb4..7b9c950664 100644
--- a/src/ol/interaction/drawinteraction.js
+++ b/src/ol/interaction/drawinteraction.js
@@ -623,6 +623,8 @@ ol.interaction.Draw.prototype.addToDrawing_ = function(event) {
  */
 ol.interaction.Draw.prototype.removeLastPoint = function() {
   var geometry = this.sketchFeature_.getGeometry();
+  goog.asserts.assertInstanceof(geometry, ol.geom.SimpleGeometry,
+      'geometry must be an ol.geom.SimpleGeometry');
   var coordinates, sketchLineGeom;
   if (this.mode_ === ol.interaction.DrawMode.LINE_STRING) {
     coordinates = this.sketchCoords_;
@@ -632,6 +634,8 @@ ol.interaction.Draw.prototype.removeLastPoint = function() {
     coordinates = this.sketchCoords_[0];
     coordinates.splice(-2, 1);
     sketchLineGeom = this.sketchLine_.getGeometry();
+    goog.asserts.assertInstanceof(sketchLineGeom, ol.geom.LineString,
+        'sketchLineGeom must be an ol.geom.LineString');
     sketchLineGeom.setCoordinates(coordinates);
     this.geometryFunction_(this.sketchCoords_, geometry);
   }