def test_calculate_exchange_rate_by_inference(self):
# Arrange
converter = ExchangeRateCalculator()
bid_rates = {
"USD/JPY": Decimal("110.100"),
"AUD/USD": Decimal("0.80000"),
}
ask_rates = {
"USD/JPY": Decimal("110.130"),
"AUD/USD": Decimal("0.80010"),
}
# Act
result1 = converter.get_rate(
JPY,
AUD,
PriceType.BID,
bid_rates,
ask_rates,
)
result2 = converter.get_rate(
AUD,
JPY,
PriceType.ASK,
bid_rates,
ask_rates,
)
# Assert
assert Decimal("0.01135331516802906448683015441") == pytest.approx(
result1) # JPYAUD
assert Decimal("88.11501299999999999999999997") == pytest.approx(
result2) # AUDJPY
def test_get_rate_when_price_type_last_raises_value_error(self):
# Arrange
converter = ExchangeRateCalculator()
bid_rates = {"AUD/USD": Decimal("0.80000")}
ask_rates = {"AUD/USD": Decimal("0.80010")}
# Act, Assert
with pytest.raises(ValueError):
converter.get_rate(USD, JPY, PriceType.LAST, bid_rates, ask_rates)
def test_get_rate(self):
# Arrange
converter = ExchangeRateCalculator()
bid_rates = {"AUD/USD": Decimal("0.80000")}
ask_rates = {"AUD/USD": Decimal("0.80010")}
# Act
result = converter.get_rate(
AUD,
USD,
PriceType.BID,
bid_rates,
ask_rates,
)
# Assert
assert result == Decimal("0.80000")
def test_get_rate_when_no_currency_rate_returns_zero(self):
# Arrange
converter = ExchangeRateCalculator()
bid_rates = {"AUD/USD": Decimal("0.80000")}
ask_rates = {"AUD/USD": Decimal("0.80010")}
# Act
result = converter.get_rate(
USD,
JPY,
PriceType.BID,
bid_rates,
ask_rates,
)
# Assert
assert result == 0
def test_calculate_exchange_rate_for_mid_price_type2(self):
# Arrange
converter = ExchangeRateCalculator()
bid_rates = {"USD/JPY": Decimal("110.100")}
ask_rates = {"USD/JPY": Decimal("110.130")}
# Act
result = converter.get_rate(
USD,
JPY,
PriceType.MID,
bid_rates,
ask_rates,
)
# Assert
assert result == Decimal("110.115")
def test_calculate_exchange_rate_for_mid_price_type(self):
# Arrange
converter = ExchangeRateCalculator()
bid_rates = {"USD/JPY": Decimal("110.100")}
ask_rates = {"USD/JPY": Decimal("110.130")}
# Act
result = converter.get_rate(
JPY,
USD,
PriceType.MID,
bid_rates,
ask_rates,
)
# Assert
assert result == Decimal("0.009081414884438995595513781047")
def test_get_rate_for_inverse2(self):
# Arrange
converter = ExchangeRateCalculator()
bid_rates = {"USD/JPY": Decimal("110.100")}
ask_rates = {"USD/JPY": Decimal("110.130")}
# Act
result = converter.get_rate(
JPY,
USD,
PriceType.BID,
bid_rates,
ask_rates,
)
# Assert
assert Decimal("0.009082652") == pytest.approx(result)
def test_get_rate_for_inverse1(self):
# Arrange
converter = ExchangeRateCalculator()
bid_rates = {"BTC/USD": Decimal("10501.5")}
ask_rates = {"BTC/USD": Decimal("10500.0")}
# Act
result = converter.get_rate(
USD,
BTC,
PriceType.BID,
bid_rates,
ask_rates,
)
# Assert
assert result == Decimal("0.00009522449173927534161786411465")