message: Fized iOS integration test
diff: }
  - (void)testOpenPoolLedgerWorksForIncompatibleProtocolVersion {
  + NSError *ret = [[PoolUtils sharedInstance] setProtocolVersion:@(1)];
  + XCTAssertEqual(ret.code, Success, @"PoolUtils::setProtocolVersion() failed!");
  +
  NSString *txnFilePath = [[PoolUtils sharedInstance] createGenesisTxnFileForTestPool:[TestUtils pool]
  nodesCount:nil
  txnFilePath:nil];
  NSString *poolConfig = [[PoolUtils sharedInstance] poolConfigJsonForTxnFilePath:txnFilePath];
  // 1. Create pool ledger config
  - NSError *ret = [[PoolUtils sharedInstance] createPoolLedgerConfigWithPoolName:[TestUtils pool]
  + ret = [[PoolUtils sharedInstance] createPoolLedgerConfigWithPoolName:[TestUtils pool]
  poolConfig:poolConfig];
  XCTAssertEqual(ret.code, Success, @"PoolUtils::createPoolLedgerConfigWithPoolName() failed!");
  