[fix]UT

Author: luoxiao-supermap

test/openlayers/overlay/GraphicSpec.js

@@ -683,7 +683,20 @@ describe('openlayers_GraphicLayer', () => {
             })
         });
         map.addLayer(graphicLayer);
+        const source = graphicLayer.getSource();
+        source._forEachFeatureAtCoordinate([0, 0], 1, (result) => {
+            expect(result).not.toBeNull();
+        });
+        const res = source.findGraphicByPixel({pixel: [0,0]}, source);
+        expect(res).toBeUndefined();
+        const res1 = source.getDeckglArguments(source, {pixel: [0,0]}, graphics[0]);
+        expect(res1).not.toBeNull();
+        let pixel = map.getPixelFromCoordinate([0, 0]);
+        map.forEachFeatureAtPixel(pixel, (graphic, layer) => {
+            expect(graphic).toBe(graphics[0]);
+            expect(layer).toBe(graphicLayer);
+        });
         done();
-      })
+      });
     })
 });