stable/freqtrade/tests/test_backtesting.py

# pragma pylint: disable=missing-docstring
import json
import logging
import os

import pytest
import arrow
from pandas import DataFrame

from freqtrade import exchange
from freqtrade.analyze import analyze_ticker
from freqtrade.exchange import Bittrex
from freqtrade.main import should_sell
from freqtrade.persistence import Trade

logging.disable(logging.DEBUG)  # disable debug logs that slow backtesting a lot


def format_results(results):
    return 'Made {} buys. Average profit {:.2f}%. Total profit was {:.3f}. Average duration {:.1f} mins.'.format(
        len(results.index),
        results.profit.mean() * 100.0,
        results.profit.sum(),
        results.duration.mean() * 5
    )


def print_pair_results(pair, results):
    print('For currency {}:'.format(pair))
    print(format_results(results[results.currency == pair]))


@pytest.fixture
def pairs():
    return ['btc-neo', 'btc-eth', 'btc-omg', 'btc-edg', 'btc-pay',
            'btc-pivx', 'btc-qtum', 'btc-mtl', 'btc-etc', 'btc-ltc']


@pytest.fixture
def conf():
    return {
        "minimal_roi": {
            "50":  0.0,
            "40":  0.01,
            "30":  0.02,
            "0":  0.045
        },
        "stoploss": -0.40
    }


def backtest(conf, pairs, mocker):
    trades = []
    exchange._API = Bittrex({'key': '', 'secret': ''})
    mocked_history = mocker.patch('freqtrade.analyze.get_ticker_history')
    mocker.patch.dict('freqtrade.main._CONF', conf)
    mocker.patch('arrow.utcnow', return_value=arrow.get('2017-08-20T14:50:00'))
    for pair in pairs:
        with open('freqtrade/tests/testdata/'+pair+'.json') as data_file:
            mocked_history.return_value = json.load(data_file)
            ticker = analyze_ticker(pair)[['close', 'date', 'buy']].copy()
            # for each buy point
            for row in ticker[ticker.buy == 1].itertuples(index=True):
                trade = Trade(
                    open_rate=row.close,
                    open_date=row.date,
                    amount=1,
                    fee=exchange.get_fee()*2
                )
                # calculate win/lose forwards from buy point
                for row2 in ticker[row.Index:].itertuples(index=True):
                    if should_sell(trade, row2.close, row2.date):
                        current_profit = trade.calc_profit(row2.close)

                        trades.append((pair, current_profit, row2.Index - row.Index))
                        break
    labels = ['currency', 'profit', 'duration']
    results = DataFrame.from_records(trades, columns=labels)
    return results


@pytest.mark.skipif(not os.environ.get('BACKTEST', False), reason="BACKTEST not set")
def test_backtest(conf, pairs, mocker, report=True):
    results = backtest(conf, pairs, mocker)

    print('====================== BACKTESTING REPORT ================================')
    for pair in pairs:
        print_pair_results(pair, results)
    print('TOTAL OVER ALL TRADES:')
    print(format_results(results))