MINOR: tileWrappingEnabled fixes (#1767)

- Added test
- Log warning when set and projection is spherical

@here/harp-mapview/lib/MapView.ts

@@ -1262,6 +1262,10 @@ export class MapView extends EventDispatcher {
     }
 
     set tileWrappingEnabled(enabled: boolean) {
+        if (this.projection.type === ProjectionType.Spherical) {
+            logger.warn("Setting this with spherical projection has no affect. Was this intended?");
+            return;
+        }
         if (enabled !== this.m_tileWrappingEnabled) {
             this.m_tileWrappingEnabled = enabled;
             this.m_visibleTiles = this.createVisibleTileSet();

@here/harp-mapview/test/MapViewTest.ts

@@ -622,6 +622,22 @@ describe("MapView", function() {
         }
     });
 
+    it("correctly set and get tile wrapping mode", function() {
+        mapView = new MapView({ canvas, projection: mercatorProjection });
+        const vts = mapView.visibleTileSet;
+        mapView.tileWrappingEnabled = false;
+        expect(mapView.tileWrappingEnabled).equal(false);
+        const vts2 = mapView.visibleTileSet;
+        // Ensure the VisibleTileSet was recreated
+        expect(vts).to.be.not.equal(vts2);
+    });
+
+    it("ignore set and get tile wrapping mode for sphere projection", function() {
+        mapView = new MapView({ canvas, projection: sphereProjection });
+        mapView.tileWrappingEnabled = false;
+        expect(mapView.tileWrappingEnabled).equal(true);
+    });
+
     it("supports #dispose", async function() {
         const dataSource = new FakeOmvDataSource({ name: "omv" });
         const dataSourceDisposeStub = sinon.stub(dataSource, "dispose");