     XCTAssert(
       RxUIApplicationTestCase
       .statesFromCall {
-        $0.application(
+        $0.application!(
           UIApplication.shared,
           handleEventsForBackgroundURLSession: "x",
           completionHandler: {}

    XCTAssert(
      RxUIApplicationTestCase
      .statesFromCall {
        $0.application(
          UIApplication.shared,
          shouldRestoreApplicationState: CoderStub(id: "x")
        )

    XCTAssert(
      RxUIApplicationTestCase
      .statesFromCall {
        $0.application!(
          UIApplication.shared,
          didFailToRegisterForRemoteNotificationsWithError: ErrorStub(id: "x")
        )
