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test_main.py
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test_main.py
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#!/usr/bin/python
from decimal import Decimal
from datetime import datetime, date, timedelta
from io import StringIO
import pytest
from pytest import approx
from currency_converter import (
CurrencyConverter,
S3CurrencyConverter,
RateNotFoundError,
ECB_URL,
CURRENCY_FILE,
SINGLE_DAY_ECB_URL,
SINGLE_DAY_CURRENCY_FILE,
)
c0 = CurrencyConverter()
c1 = CurrencyConverter(fallback_on_missing_rate=True)
c2 = CurrencyConverter(fallback_on_wrong_date=True)
c3 = CurrencyConverter(
fallback_on_missing_rate=True,
fallback_on_wrong_date=True,
fallback_on_missing_rate_method="linear_interpolation",
)
c4 = CurrencyConverter(
fallback_on_missing_rate=True,
fallback_on_wrong_date=True,
fallback_on_missing_rate_method="last_known",
)
c5 = CurrencyConverter(CURRENCY_FILE)
converters = [c0, c1, c2, c3, c4, c5]
converters_with_missing_rate_fallback = [c1, c3, c4]
converters_with_wrong_date_fallback = [c2, c3, c4]
converters_without_missing_rate_fallback = [c0, c2, c5]
converters_without_wrong_date_fallback = [c0, c1, c5]
@pytest.fixture
def fallback_with_linear_interpolation():
return c3
@pytest.fixture
def fallback_with_last_known():
return c4
@pytest.fixture
def decimal_converter():
return CurrencyConverter(decimal=True)
HISTORY_CURRENCIES = {
"HUF",
"LVL",
"RON",
"ISK",
"SIT",
"CHF",
"DKK",
"MYR",
"PHP",
"KRW",
"HKD",
"IDR",
"HRK",
"MTL",
"LTL",
"CZK",
"CYP",
"NZD",
"ZAR",
"NOK",
"AUD",
"SGD",
"THB",
"CNY",
"SKK",
"GBP",
"TRL",
"TRY",
"JPY",
"BGN",
"USD",
"CAD",
"RUB",
"SEK",
"EUR",
"BRL",
"ROL",
"PLN",
"EEK",
"ILS",
"MXN",
"INR",
}
SINGLE_DAY_CURRENCIES = {
"BRL",
"CZK",
"PHP",
"THB",
"NOK",
"PLN",
"SGD",
"BGN",
"HKD",
"MYR",
"ISK",
"CAD",
"KRW",
"JPY",
"DKK",
"ZAR",
"RON",
"IDR",
"NZD",
"INR",
"MXN",
"TRY",
"USD",
"CNY",
"HUF",
"EUR",
"GBP",
"SEK",
"AUD",
"ILS",
"CHF",
}
class TestRates:
@pytest.mark.parametrize("c", converters)
def test_convert(self, c):
assert c.convert(10, "EUR", "USD", date(2013, 3, 21)) == approx(12.91)
assert c.convert(10, "EUR", "USD", date(2014, 3, 28)) == approx(13.758999)
assert c.convert(10, "USD", "EUR", date(2014, 3, 28)) == approx(7.26797)
@pytest.mark.parametrize("c", converters)
def test_convert_with_datetime(self, c):
assert c.convert(10, "EUR", "USD", datetime(2013, 3, 21)) == approx(12.91)
assert c.convert(10, "EUR", "USD", datetime(2014, 3, 28)) == approx(13.758999)
assert c.convert(10, "USD", "EUR", datetime(2014, 3, 28)) == approx(7.26797)
@pytest.mark.parametrize("c", converters)
def test_convert_to_ref_currency(self, c):
assert c.convert(10, "EUR") == 10.0
assert c.convert(10, "EUR", "EUR") == 10.0
def test_decimal_converter(self, decimal_converter):
dc = decimal_converter
assert dc.convert(10, "EUR", "USD", date(2013, 3, 21)) == Decimal("12.910")
assert dc.convert(10, "EUR", "USD", date(2014, 3, 28)) == Decimal("13.7590")
assert dc.convert(10, "USD", "EUR", date(2014, 3, 28)) == Decimal(
"7.267970055963369430917944618"
)
assert dc.convert(10, "EUR") == Decimal(10)
assert dc.convert(10, "EUR", "EUR") == Decimal(10)
class TestErrorCases:
@pytest.mark.parametrize("c", converters)
def test_wrong_currency(self, c):
with pytest.raises(ValueError):
c.convert(1, "AAA")
@pytest.mark.parametrize("c", converters_without_missing_rate_fallback)
def test_convert_with_missing_rate(self, c):
with pytest.raises(RateNotFoundError):
c.convert(10, "BGN", date=date(2010, 11, 21))
@pytest.mark.parametrize("c", converters_with_missing_rate_fallback)
def test_convert_fallback_on_missing_rate(self, c):
assert c1.convert(10, "BGN", date=date(2010, 11, 21)) == approx(5.112997238)
@pytest.mark.parametrize("c", converters_without_wrong_date_fallback)
def test_convert_with_wrong_date(self, c):
with pytest.raises(RateNotFoundError):
c.convert(10, "EUR", "USD", date=date(1986, 2, 2))
@pytest.mark.parametrize("c", converters_with_wrong_date_fallback)
def test_convert_fallback_on_wrong_date(self, c):
assert c.convert(10, "EUR", "USD", date=date(1986, 2, 2)) == approx(11.789)
def test_fallback_methds(
self, fallback_with_linear_interpolation, fallback_with_last_known
):
li = fallback_with_linear_interpolation
ln = fallback_with_last_known
assert li.convert(10, "USD", date=date(2019, 12, 8)) == approx(9.02418)
assert ln.convert(10, "USD", date=date(2019, 12, 8)) == approx(9.01388)
def last_n_days(n):
return [date.today() - timedelta(days=d) for d in reversed(range(n + 1))]
class TestAttributes:
@pytest.mark.parametrize("c", converters)
def test_bounds(self, c):
assert c.bounds["USD"][0] == date(1999, 1, 4)
assert c.bounds["BGN"][0] == date(2000, 7, 19)
assert c.bounds["EUR"][0] == date(1999, 1, 4)
assert c.bounds["USD"][1] in last_n_days(7)
assert c.bounds["BGN"][1] in last_n_days(7)
assert c.bounds["EUR"][1] in last_n_days(7)
@pytest.mark.parametrize("c", converters)
def test_currencies(self, c):
assert "EUR" in c.currencies
assert c.currencies == HISTORY_CURRENCIES
class TestCustomObject:
c = CurrencyConverter(
currency_file=None, fallback_on_wrong_date=True, fallback_on_missing_rate=True
)
c.load_lines(
StringIO(
"""\
Date,USD,AAA,
2014-03-29,2,N/A
2014-03-27,6,0
2014-03-23,18,N/A
2014-03-22,N/A,0"""
)
)
def test_convert(self):
assert self.c.convert(10, "EUR", "USD") == approx(20)
assert self.c.convert(10, "USD", "EUR") == approx(5)
def test_fallback_date(self):
# Fallback to 2014-03-29 rate of 2
assert self.c.convert(10, "EUR", "USD", date(2015, 1, 1)) == approx(20)
assert self.c.convert(10, "USD", "EUR", date(2015, 1, 1)) == approx(5)
# Fallback to 2014-03-23 rate of 18
assert self.c.convert(10, "EUR", "USD", date(2012, 1, 1)) == approx(180)
assert self.c.convert(10, "USD", "EUR", date(2012, 1, 1)) == approx(0.55555555)
def test_fallback_rate(self):
# Fallback rate is the average between 2 and 6, so 4
assert self.c.convert(10, "EUR", "USD", date(2014, 3, 28)) == approx(40)
assert self.c.convert(10, "USD", "EUR", date(2014, 3, 28)) == approx(2.5)
# Fallback rate is the weighted mean between 6 (d:1) and 18 (d:3), so 9
assert self.c.convert(10, "EUR", "USD", date(2014, 3, 26)) == approx(90)
assert self.c.convert(10, "USD", "EUR", date(2014, 3, 26)) == approx(1.11111111)
def test_attributes(self):
assert self.c.currencies == {"EUR", "USD", "AAA"}
assert self.c.bounds == {
"USD": (date(2014, 3, 23), date(2014, 3, 29)),
"AAA": (date(2014, 3, 22), date(2014, 3, 27)),
# Max of previous ranges
"EUR": (date(2014, 3, 22), date(2014, 3, 29)),
}
@pytest.mark.parametrize(
"c",
[
CurrencyConverter(SINGLE_DAY_ECB_URL),
CurrencyConverter(SINGLE_DAY_CURRENCY_FILE),
],
)
def test_single_day_sources(c):
assert c.currencies == SINGLE_DAY_CURRENCIES
assert c.bounds["USD"][0] == c.bounds["USD"][1]
assert c.bounds["USD"][0] in last_n_days(7)
class TestCustomSource:
def test_local_zip_file(self):
c = CurrencyConverter(CURRENCY_FILE)
assert c.currencies == HISTORY_CURRENCIES
assert c.convert(10, "EUR", "USD", date(2013, 3, 21)) == approx(12.91)
def test_remote_zip_file(self):
c = CurrencyConverter(ECB_URL)
assert c.currencies == HISTORY_CURRENCIES
assert c.convert(10, "EUR", "USD", date(2013, 3, 21)) == approx(12.91)
def test_local_clear_file(self):
c = CurrencyConverter(SINGLE_DAY_CURRENCY_FILE)
assert c.currencies == SINGLE_DAY_CURRENCIES
def test_remote_clear_file(self):
c = CurrencyConverter(
"https://raw.githubusercontent.com/alexprengere"
"/currencyconverter/master/currency_converter/eurofxref.csv"
)
assert c.currencies == SINGLE_DAY_CURRENCIES
class TestS3:
def test_S3_currency_file_required(self):
with pytest.raises(TypeError):
S3CurrencyConverter()
def test_S3_currency_file_needs_get_contents_as_strings(self):
with pytest.raises(AttributeError):
S3CurrencyConverter("simple_string")