Minor test fixes.

builtin/providers/aws/resource_aws_vpn_gateway.go

@@ -115,7 +115,7 @@ func resourceAwsVpnGatewayUpdate(d *schema.ResourceData, meta interface{}) error
 
     d.SetPartial("tags")
 
-    return nil
+    return resourceAwsVpnGatewayRead(d, meta)
 }
 
 func resourceAwsVpnGatewayDelete(d *schema.ResourceData, meta interface{}) error {

builtin/providers/aws/resource_aws_vpn_gateway_test.go

@@ -98,6 +98,7 @@ func TestAccVpnGateway_tags(t *testing.T) {
 				Config: testAccCheckVpnGatewayConfigTags,
 				Check: resource.ComposeTestCheckFunc(
 					testAccCheckVpnGatewayExists("aws_vpn_gateway.foo", &v),
+					testAccCheckTagsSDK(&v.Tags, "foo", "bar"),
 				),
 			},