function assertSignInSuccessWithAuthResultCallbackInvoked(
    authResult, opt_redirectUrl) {
  assertObjectEquals(authResult.user, signInCallbackUser);
  assertObjectEquals(authResult.credential, signInCallbackCredential);
  assertObjectEquals(authResult.additionalUserInfo,
                     signInCallbackAdditionalUserInfo);
  assertEquals(authResult.operationType, signInCallbackOperationType);
  assertEquals(opt_redirectUrl, signInCallbackRedirectUrl);
}
@param {!fireabaseui.auth.AuthResult} authResult The returned auth result.
@param {string=} opt_redirectUrl The redirect URL if available.