@Test
/** Tests the present value long/short parity. */
public void presentValueLongShort() {
final ForexOptionDigitalDefinition forexOptionShortDefinition =
new ForexOptionDigitalDefinition(FOREX_DEFINITION, OPTION_EXP_DATE, IS_CALL, !IS_LONG);
final InstrumentDerivative forexOptionShort =
forexOptionShortDefinition.toDerivative(REFERENCE_DATE, CURVES_NAME);
final MultipleCurrencyAmount pvShort =
METHOD_DIGITAL_SPREAD.presentValue(forexOptionShort, SMILE_BUNDLE);
final MultipleCurrencyAmount pvLong =
METHOD_DIGITAL_SPREAD.presentValue(FOREX_CALL_OPTION, SMILE_BUNDLE);
assertEquals(
"Forex Digital option: present value long/short parity",
pvLong.getAmount(USD),
-pvShort.getAmount(USD),
1E-2);
final MultipleCurrencyAmount ceShort =
METHOD_DIGITAL_SPREAD.currencyExposure(forexOptionShort, SMILE_BUNDLE);
final MultipleCurrencyAmount ceLong =
METHOD_DIGITAL_SPREAD.currencyExposure(FOREX_CALL_OPTION, SMILE_BUNDLE);
assertEquals(
"Forex Digital option: currency exposure long/short parity",
ceLong.getAmount(USD),
-ceShort.getAmount(USD),
1E-2);
assertEquals(
"Forex Digital option: currency exposure long/short parity",
ceLong.getAmount(EUR),
-ceShort.getAmount(EUR),
1E-2);
}
@Test
/** Tests the currency exposure against the present value. */
public void currencyExposureVsPresentValue() {
MultipleCurrencyAmount pv = METHOD_DIGITAL_SPREAD.presentValue(FOREX_CALL_OPTION, SMILE_BUNDLE);
MultipleCurrencyAmount ce =
METHOD_DIGITAL_SPREAD.currencyExposure(FOREX_CALL_OPTION, SMILE_BUNDLE);
assertEquals(
"Forex Digital option: call spread method - currency exposure vs present value",
ce.getAmount(USD) + ce.getAmount(EUR) * SPOT,
pv.getAmount(USD),
TOLERANCE_PRICE);
}
@Test
/** Tests the put/call parity currency exposure. */
public void currencyExposurePutCallParity() {
final double strike = 1.45;
final boolean isCall = true;
final boolean isLong = true;
final double notional = 100000000;
final ZonedDateTime payDate =
ScheduleCalculator.getAdjustedDate(
REFERENCE_DATE, Period.ofMonths(9), BUSINESS_DAY, CALENDAR);
final ZonedDateTime expDate =
ScheduleCalculator.getAdjustedDate(payDate, -SETTLEMENT_DAYS, CALENDAR);
final ForexDefinition forexUnderlyingDefinition =
new ForexDefinition(EUR, USD, payDate, notional, strike);
final ForexOptionDigitalDefinition forexOptionDefinitionCall =
new ForexOptionDigitalDefinition(forexUnderlyingDefinition, expDate, isCall, isLong);
final ForexOptionDigitalDefinition forexOptionDefinitionPut =
new ForexOptionDigitalDefinition(forexUnderlyingDefinition, expDate, !isCall, isLong);
final ForexOptionDigital forexOptionCall =
forexOptionDefinitionCall.toDerivative(REFERENCE_DATE, CURVES_NAME);
final ForexOptionDigital forexOptionPut =
forexOptionDefinitionPut.toDerivative(REFERENCE_DATE, CURVES_NAME);
final MultipleCurrencyAmount currencyExposureCall =
METHOD_DIGITAL_SPREAD.currencyExposure(forexOptionCall, SMILE_BUNDLE);
final MultipleCurrencyAmount currencyExposurePut =
METHOD_DIGITAL_SPREAD.currencyExposure(forexOptionPut, SMILE_BUNDLE);
final Double pvCash =
PVC.visit(forexOptionPut.getUnderlyingForex().getPaymentCurrency2(), CURVES);
assertEquals(
"Forex Digital option: currency exposure put/call parity foreign",
0,
currencyExposureCall.getAmount(EUR) + currencyExposurePut.getAmount(EUR),
TOLERANCE_PRICE);
assertEquals(
"Forex Digital option: currency exposure put/call parity domestic",
Math.abs(pvCash),
currencyExposureCall.getAmount(USD) + currencyExposurePut.getAmount(USD),
TOLERANCE_PRICE);
}
@Test
/** Tests the currency exposure in a flat smile case. */
public void currencyExposureFlat() {
MultipleCurrencyAmount ceSpread =
METHOD_DIGITAL_SPREAD.currencyExposure(FOREX_CALL_OPTION, SMILE_BUNDLE_FLAT);
MultipleCurrencyAmount ceBlack =
METHOD_DIGITAL_BLACK.currencyExposure(FOREX_CALL_OPTION, SMILE_BUNDLE_FLAT);
assertEquals(
"Forex Digital option: call spread method - currency exposure",
ceBlack.getAmount(USD),
ceSpread.getAmount(USD),
TOLERANCE_CE_FLAT);
assertEquals(
"Forex Digital option: call spread method - currency exposure",
ceBlack.getAmount(EUR),
ceSpread.getAmount(EUR),
TOLERANCE_CE_FLAT);
}
@Test
/** Tests the currency exposure. Method vs Calculator. */
public void currencyExposureMethodVCalculator() {
MultipleCurrencyAmount ceMethod =
METHOD_DIGITAL_SPREAD.currencyExposure(FOREX_CALL_OPTION, SMILE_BUNDLE);
CurrencyExposureCallSpreadBlackForexCalculator calculator =
new CurrencyExposureCallSpreadBlackForexCalculator(STANDARD_SPREAD);
MultipleCurrencyAmount ceCalculator = calculator.visit(FOREX_CALL_OPTION, SMILE_BUNDLE);
assertEquals(
"Forex Digital option: call spread method - currency exposure",
ceMethod.getAmount(USD),
ceCalculator.getAmount(USD),
TOLERANCE_PRICE);
assertEquals(
"Forex Digital option: call spread method - currency exposure",
ceMethod.getAmount(EUR),
ceCalculator.getAmount(EUR),
TOLERANCE_PRICE);
}
@Test
/** Tests the currency exposure with an explicit computation. */
public void currencyExposure() {
double spread = 0.0001; // Relative spread.
double strikeM = STRIKE * (1 - spread);
double strikeP = STRIKE * (1 + spread);
Forex forexM =
new Forex(
FOREX.getPaymentCurrency1().withAmount(1.0),
FOREX.getPaymentCurrency2().withAmount(-strikeM));
Forex forexP =
new Forex(
FOREX.getPaymentCurrency1().withAmount(1.0),
FOREX.getPaymentCurrency2().withAmount(-strikeP));
ForexOptionVanilla vanillaM =
new ForexOptionVanilla(forexM, FOREX_CALL_OPTION.getExpirationTime(), IS_CALL, IS_LONG);
ForexOptionVanilla vanillaP =
new ForexOptionVanilla(forexP, FOREX_CALL_OPTION.getExpirationTime(), IS_CALL, IS_LONG);
MultipleCurrencyAmount ceP = METHOD_VANILLA_BLACK.currencyExposure(vanillaP, SMILE_BUNDLE);
MultipleCurrencyAmount ceM = METHOD_VANILLA_BLACK.currencyExposure(vanillaM, SMILE_BUNDLE);
MultipleCurrencyAmount ceExpected =
ceM.plus(ceP.multipliedBy(-1.0))
.multipliedBy(
1.0 / (strikeP - strikeM) * Math.abs(FOREX.getPaymentCurrency2().getAmount()));
MultipleCurrencyAmount ceComputed =
METHOD_DIGITAL_SPREAD.currencyExposure(FOREX_CALL_OPTION, SMILE_BUNDLE);
assertEquals(
"Forex Digital option: call spread method - currency exposure",
ceExpected.getAmount(USD),
ceComputed.getAmount(USD),
TOLERANCE_PRICE);
assertEquals(
"Forex Digital option: call spread method - currency exposure",
ceExpected.getAmount(EUR),
ceComputed.getAmount(EUR),
TOLERANCE_PRICE);
}