fin-defs/test/test_exchange_rate_sample.py

import datetime
from decimal import Decimal

import fin_defs

NOW = datetime.datetime.now()
THEN = NOW - datetime.timedelta(days=1)

SAMPLE_AVERAGE = fin_defs.ExchangeRateSample(
    NOW, (fin_defs.FiatCurrency.DKK, fin_defs.FiatCurrency.USD), _average=Decimal(1),
)

SAMPLE_HIGH_LOW = fin_defs.ExchangeRateSample(
    NOW,
    (fin_defs.FiatCurrency.DKK, fin_defs.FiatCurrency.USD),
    high=Decimal(1),
    low=Decimal('0.5'),
)


def test_sample_average():
    assert SAMPLE_AVERAGE.average == 1
    assert SAMPLE_HIGH_LOW.average == Decimal('0.75')


def test_invert_sample():
    inverted = SAMPLE_HIGH_LOW.invert_exchange_rate()
    assert inverted.asset_pair == (fin_defs.FiatCurrency.USD, fin_defs.FiatCurrency.DKK)
    assert inverted.high == 2
    assert inverted.low == 1
    assert inverted.average == 1.5


def test_replace_timestamp():
    assert SAMPLE_HIGH_LOW.replace_timestamp(THEN).timestamp == THEN