【UT】 fix openlayers TurfSpec.js UT review by songym

liqian7 · liqian7 · commit f54379adcb05 · 2019-12-21T18:36:16.000+08:00
diff --git a/test/openlayers/overlay/TurfSpec.js b/test/openlayers/overlay/TurfSpec.js
@@ -1,12 +1,15 @@
 import { Turf } from '../../../src/openlayers/overlay/Turf';
 import * as turf from '@turf/turf';
+import Collection from 'ol/Collection';
+
 describe('openlayers_Turf', () => {
     var opt_options;
     var serviceResult;
 
     it('parse,parseOption,rocess_Measurement.along,', (done) => {
         opt_options = {
             attributions: " ",
+            features: new Collection(),
             features: " ",
             format: "",
             logo: "",
