Mock electron.ipcRenderer.on to prevent errors in React compoment test cases

Signed-off-by: Hung-Han (Henry) Chen <chenhungh@gmail.com>
Signed-off-by: Hung-Han (Henry) Chen <1474479+chenhunghan@users.noreply.github.com>

__mocks__/electron.ts

@@ -13,5 +13,8 @@ module.exports = {
       getPath: jest.fn()
     }
   },
-  dialog: jest.fn()
+  dialog: jest.fn(),
+  ipcRenderer: {
+    on: jest.fn()
+  }
 };