【fix】UT

Author: songyumeng

src/common/commontypes/geometry/LinearRing.js

@@ -43,7 +43,7 @@ export class LinearRing extends LineString {
             components = [components];
         }
         let len = components.length;
-        if (components[0].equals(components[components.length - 1])) {
+        if (len > 1 && components[0].equals(components[components.length - 1])) {
             len = components.length - 1;
         }
         for (var i = 0; i < len; i++) {

test/openlayers/core/UtilSpec.js

@@ -116,7 +116,7 @@ describe('openlayers_Util', () => {
         var lineString = polygon.components[0];
         expect(lineString instanceof LinearRing).toBeTruthy();
         expect(lineString.components).not.toBeNull();
-        expect(lineString.components.length).toBe(3);
+        expect(lineString.components.length).toBe(4);
         var point = lineString.components[0];
         expect(point instanceof Point).toBeTruthy();
         expect(point.x).toBe(-2);