TestNg - How to merge two dataproviders horizontally

Question

Can you please let me know if we can merge the below 2 dataproviders

public Object[][] dp1() {
   User user = new User(1L, "Arun");
   Transaction trx = new Transaction(1L, "atm");   
  return new Object[][] {
      new Object[] { user , trx, true  }

  };
}

public Object[][] dp2() {
  return new Object[][] {
      new Object[] { "e", "f" }
  };
}

I want to merge them horizontally, after merge the following output is desired in the merged dataprovider { user , trx, true, "e", "f" }

Answer 1

there is no way to set multiple data provider in testNG, so i am using a utility method to merge as below.

@DataProvider(name = "myDataProvider")
public Object[][] myDataProvider() {
    return mergeDataProviders(myDataProvider1(),myDataProvider2());
}

@DataProvider(name = "myDataProvider1")
public Object[][] myDataProvider1() {
    return new Object[][]{};
}

@DataProvider(name = "myDataProvider2")
public Object[][] myDataProvider2() {
    return new Object[][]{};
}

private static  Object[][]  mergeDataProviders(Object[][] ... dataProviders) {
    return Arrays.stream(args)
            .map(Arrays::asList)
            .flatMap(List::stream).toArray(Object[][]::new);
}