TestNG Looped test

How will I test multiple values using TestNG? for example a method that returns true for a parameter < 80 and false otherwise?

I find an answer on JUnit looped test

For your case you could repeat 100 times:

@ParameterizedTest
@MethodSource("args")
public void so(int argument)
{
   assertTrue((argument < 80) == someMethod(argument));
}

private static IntStream args()
{
   return IntStream.range(0, 100);
}