//-------------------------------------------------------------------------
public virtual void test_rate()
{
ImmutableRatesProvider prov = createProvider(RATE_START, RATE_END);
InflationMonthlyRateComputation ro = InflationMonthlyRateComputation.of(GB_RPIX, REFERENCE_START_MONTH, REFERENCE_END_MONTH);
ForwardInflationMonthlyRateComputationFn obsFn = ForwardInflationMonthlyRateComputationFn.DEFAULT;
double rateExpected = RATE_END / RATE_START - 1.0;
assertEquals(obsFn.rate(ro, DUMMY_ACCRUAL_START_DATE, DUMMY_ACCRUAL_END_DATE, prov), rateExpected, EPS);
// explain
ExplainMapBuilder builder = ExplainMap.builder();
assertEquals(obsFn.explainRate(ro, DUMMY_ACCRUAL_START_DATE, DUMMY_ACCRUAL_END_DATE, prov, builder), rateExpected, EPS);
ExplainMap built = builder.build();
assertEquals(built.get(ExplainKey.OBSERVATIONS).Present, true);
assertEquals(built.get(ExplainKey.OBSERVATIONS).get().size(), 2);
ExplainMap explain0 = built.get(ExplainKey.OBSERVATIONS).get().get(0);
assertEquals(explain0.get(ExplainKey.FIXING_DATE), REFERENCE_START_MONTH.atEndOfMonth());
assertEquals(explain0.get(ExplainKey.INDEX), GB_RPIX);
assertEquals(explain0.get(ExplainKey.INDEX_VALUE), RATE_START);
ExplainMap explain1 = built.get(ExplainKey.OBSERVATIONS).get().get(1);
assertEquals(explain1.get(ExplainKey.FIXING_DATE), REFERENCE_END_MONTH.atEndOfMonth());
assertEquals(explain1.get(ExplainKey.INDEX), GB_RPIX);
assertEquals(explain1.get(ExplainKey.INDEX_VALUE), RATE_END);
assertEquals(built.get(ExplainKey.COMBINED_RATE).Value.doubleValue(), rateExpected, EPS);
}
//-------------------------------------------------------------------------
public virtual void test_rateSensitivity()
{
ImmutableRatesProvider prov = createProvider(RATE_START, RATE_END);
ImmutableRatesProvider provStartUp = createProvider(RATE_START + EPS_FD, RATE_END);
ImmutableRatesProvider provStartDw = createProvider(RATE_START - EPS_FD, RATE_END);
ImmutableRatesProvider provEndUp = createProvider(RATE_START, RATE_END + EPS_FD);
ImmutableRatesProvider provEndDw = createProvider(RATE_START, RATE_END - EPS_FD);
InflationMonthlyRateComputation ro = InflationMonthlyRateComputation.of(GB_RPIX, REFERENCE_START_MONTH, REFERENCE_END_MONTH);
ForwardInflationMonthlyRateComputationFn obsFn = ForwardInflationMonthlyRateComputationFn.DEFAULT;
double rateSrtUp = obsFn.rate(ro, DUMMY_ACCRUAL_START_DATE, DUMMY_ACCRUAL_END_DATE, provStartUp);
double rateSrtDw = obsFn.rate(ro, DUMMY_ACCRUAL_START_DATE, DUMMY_ACCRUAL_END_DATE, provStartDw);
double rateEndUp = obsFn.rate(ro, DUMMY_ACCRUAL_START_DATE, DUMMY_ACCRUAL_END_DATE, provEndUp);
double rateEndDw = obsFn.rate(ro, DUMMY_ACCRUAL_START_DATE, DUMMY_ACCRUAL_END_DATE, provEndDw);
PointSensitivityBuilder sensiStr = InflationRateSensitivity.of(PriceIndexObservation.of(GB_RPIX, REFERENCE_START_MONTH), 0.5 * (rateSrtUp - rateSrtDw) / EPS_FD);
PointSensitivityBuilder sensiEnd = InflationRateSensitivity.of(PriceIndexObservation.of(GB_RPIX, REFERENCE_END_MONTH), 0.5 * (rateEndUp - rateEndDw) / EPS_FD);
PointSensitivityBuilder sensiExpected = sensiStr.combinedWith(sensiEnd);
PointSensitivityBuilder sensiComputed = obsFn.rateSensitivity(ro, DUMMY_ACCRUAL_START_DATE, DUMMY_ACCRUAL_END_DATE, prov);
assertTrue(sensiComputed.build().normalized().equalWithTolerance(sensiExpected.build().normalized(), EPS_FD));
}
