Add test to check that Style is not added a feature property

test/spec/ol/format/kml/style.kml

@@ -0,0 +1,37 @@
+<kml xmlns="http://www.opengis.net/kml/2.2" xmlns:gx="http://www.google.com/kml/ext/2.2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.opengis.net/kml/2.2 https://developers.google.com/kml/schema/kml22gx.xsd">
+    <Document>
+        <name>Drawing</name>
+        <Placemark id="linepolygon_1436780794279">
+            <Style>
+                <LineStyle>
+                    <color>ff0000ff</color>
+                    <width>3</width>
+                </LineStyle>
+                <PolyStyle>
+                    <color>660000ff</color>
+                </PolyStyle>
+            </Style>
+            <LineString>
+                <coordinates>7.282103855735575,47.252335388740185 7.286372432423239,47.23794977574282 7.353199702540651,47.23711986131712 7.287223923345992,47.26352553438413</coordinates>
+            </LineString>
+        </Placemark>
+        <Placemark id="linepolygon_1436780799384">
+            <Style>
+                <LineStyle>
+                    <color>ff0000ff</color>
+                    <width>3</width>
+                </LineStyle>
+                <PolyStyle>
+                    <color>660000ff</color>
+                </PolyStyle>
+            </Style>
+            <Polygon>
+                <outerBoundaryIs>
+                    <LinearRing>
+                        <coordinates>7.227134983319887,47.25587491183515 7.23801833800725,47.242582453518516 7.260803078150167,47.2619584739595 7.239912047946697,47.265971706882716 7.227134983319887,47.25587491183515</coordinates>
+                    </LinearRing>
+                </outerBoundaryIs>
+            </Polygon>
+        </Placemark>
+    </Document>
+</kml>

test/spec/ol/format/kmlformat.test.js

@@ -2474,6 +2474,31 @@ describe('ol.format.KML', function() {
 
   });
 
+  describe('#JSONExport', function() {
+
+    var features;
+    before(function(done) {
+      afterLoadText('spec/ol/format/kml/style.kml', function(xml) {
+        try {
+          features = format.readFeatures(xml);
+        } catch (e) {
+          done(e);
+        }
+        done();
+      });
+    });
+
+    it('feature must not have a properties property', function() {
+      var geojsonFormat = new ol.format.GeoJSON();
+      features.forEach(function(feature) {
+        var geojsonFeature = geojsonFormat.writeFeatureObject(feature);
+        expect(geojsonFeature.properties).to.be(null);
+        JSON.stringify(geojsonFeature);
+      });
+    });
+
+  });
+
   describe('#readName', function() {
 
     it('returns undefined if there is no name', function() {
@@ -2578,6 +2603,7 @@ describe('ol.format.KML', function() {
 goog.require('goog.array');
 goog.require('goog.dom.xml');
 goog.require('ol.Feature');
+goog.require('ol.format.GeoJSON');
 goog.require('ol.format.KML');
 goog.require('ol.geom.GeometryCollection');
 goog.require('ol.geom.GeometryLayout');