Added test case to DialogServiceSpec

platform/commonUI/dialog/test/DialogServiceSpec.js

@@ -121,6 +121,17 @@ define(
                 );
             });
 
+            it("invokes the overlay service with the correct parameters when" +
+                " a blocking dialog is requested", function() {
+                var dialogModel = {};
+                expect(dialogService.showBlockingMessage(dialogModel)).toBe(true);
+                expect(mockOverlayService.createOverlay).toHaveBeenCalledWith(
+                    "overlay-blocking-message",
+                    dialogModel,
+                    "t-dialog-sm"
+                );
+            });
+
         });
     }
 );