@Test
public void smallRate() throws Exception {
ExchangeRateBase rate =
new ExchangeRateBase(Value.parse(BTC, "10000"), FiatValue.parse("XXX", "0.00001"));
assertEquals("0", rate.convert(oneBtc).toPlainString()); // Tiny value!
assertEquals("1000000000", rate.convert(FiatValue.parse("XXX", "1")).toPlainString());
}
@Test
public void bigRate() throws Exception {
ExchangeRateBase rate =
new ExchangeRateBase(Value.parse(BTC, "0.0001"), FiatValue.parse("BYR", "5320387.3"));
assertEquals("53203873000", rate.convert(oneBtc).toPlainString());
assertEquals("0", rate.convert(FiatValue.parse("BYR", "1")).toPlainString()); // Tiny value!
}
@Test
public void scalingAndRounding() throws Exception {
// 1BTC = 100.1234567890NBT
// This rate causes the BTC & NBT to overflow so it sets the correct scale and rounding
ExchangeRateBase rate = new ExchangeRateBase(BTC, NBT, "100.1234567890");
// Check the rate's internal state
assertEquals("100000", rate.value1.toPlainString());
assertEquals("10012345.6789", rate.value2.toPlainString());
// Make some conversions
assertEquals("0.00998767", rate.convert(oneNbt).toPlainString());
assertEquals("0.000001", rate.convert(Value.parse(NBT, "0.0001")).toPlainString());
assertEquals("0.0001", rate.convert(Value.parse(BTC, "0.00000099")).toPlainString());
assertEquals("0.0099", rate.convert(Value.parse(BTC, "0.000099")).toPlainString());
assertEquals("10012345.6789", rate.convert(oneBtc.multiply(100000)).toPlainString());
assertEquals("1001.2346", rate.convert(oneBtc.multiply(10)).toPlainString());
assertEquals("998766.95438852", rate.convert(oneNbt.multiply(100000000)).toPlainString());
// Check too precise rates
rate = new ExchangeRateBase(BTC, NBT, "100.12345678901999");
assertEquals("100000", rate.value1.toPlainString());
assertEquals("10012345.6789", rate.value2.toPlainString());
}
@Test(expected = ArithmeticException.class)
public void coinToFiatTooSmall() throws Exception {
ExchangeRateBase rate = new ExchangeRateBase(oneBtc, FiatValue.parse("XXX", "1000000000"));
rate.convert(Value.parse(BTC, "-1000000"));
}
