### Question:
NoPointSensitivity implements PointSensitivityBuilder { @Override public PointSensitivityBuilder combinedWith(PointSensitivityBuilder other) { return ArgChecker.notNull(other, "other"); } private  NoPointSensitivity(); @Override PointSensitivityBuilder withCurrency(Currency currency); @Override PointSensitivityBuilder mapSensitivity(DoubleUnaryOperator operator); @Override PointSensitivityBuilder combinedWith(PointSensitivityBuilder other); @Override NoPointSensitivity normalize(); @Override MutablePointSensitivities buildInto(MutablePointSensitivities combination); @Override NoPointSensitivity cloned(); @Override String toString();  }### Answer:
@Test public void test_combinedWith() { PointSensitivityBuilder base = PointSensitivityBuilder.none(); PointSensitivityBuilder ibor = DummyPointSensitivity.of(GBP, date(2015, 6, 30), 2.0d); assertThat(base.combinedWith(ibor)).isSameAs(ibor); }