public void test_expandAllSpecified() {
   ImmutableIborIborSwapConvention test =
       ImmutableIborIborSwapConvention.builder()
           .name(NAME)
           .spreadLeg(IBOR3M)
           .flatLeg(IBOR6M)
           .spotDateOffset(PLUS_ONE_DAY)
           .build()
           .expand();
   assertEquals(test.getSpreadLeg(), IBOR3M.expand());
   assertEquals(test.getFlatLeg(), IBOR6M.expand());
   assertEquals(test.getSpotDateOffset(), PLUS_ONE_DAY);
 }
 // -------------------------------------------------------------------------
 public void test_builder_notEnoughData() {
   assertThrowsIllegalArg(
       () -> ImmutableIborIborSwapConvention.builder().spotDateOffset(NEXT_SAME_BUS_DAY).build());
 }