//-------------------------------------------------------------------------
public virtual void test_crossRate()
{
FxRate gbpUsd = FxRate.of(GBP, USD, 5d / 4d);
FxRate usdGbp = FxRate.of(USD, GBP, 4d / 5d);
FxRate eurUsd = FxRate.of(EUR, USD, 8d / 7d);
FxRate usdEur = FxRate.of(USD, EUR, 7d / 8d);
FxRate eurGbp = FxRate.of(EUR, GBP, (8d / 7d) * (4d / 5d));
FxRate gbpGbp = FxRate.of(GBP, GBP, 1d);
FxRate usdUsd = FxRate.of(USD, USD, 1d);
assertEquals(eurUsd.crossRate(usdGbp), eurGbp);
assertEquals(eurUsd.crossRate(gbpUsd), eurGbp);
assertEquals(usdEur.crossRate(usdGbp), eurGbp);
assertEquals(usdEur.crossRate(gbpUsd), eurGbp);
assertEquals(gbpUsd.crossRate(usdEur), eurGbp);
assertEquals(gbpUsd.crossRate(eurUsd), eurGbp);
assertEquals(usdGbp.crossRate(usdEur), eurGbp);
assertEquals(usdGbp.crossRate(eurUsd), eurGbp);
assertThrowsIllegalArg(() => gbpGbp.crossRate(gbpUsd)); // identity
assertThrowsIllegalArg(() => usdUsd.crossRate(gbpUsd)); // identity
assertThrowsIllegalArg(() => gbpUsd.crossRate(gbpUsd)); // same currencies
assertThrowsIllegalArg(() => gbpUsd.crossRate(usdGbp)); // same currencies
assertThrowsIllegalArg(() => gbpUsd.crossRate(FxRate.of(EUR, CAD, 12d / 5d))); // no common currency
}
