stable/tests/test_configuration.py

# pragma pylint: disable=missing-docstring, protected-access, invalid-name
import json
import logging
import sys
import warnings
from copy import deepcopy
from pathlib import Path
from unittest.mock import MagicMock

import pytest
from jsonschema import ValidationError

from freqtrade.commands import Arguments
from freqtrade.configuration import Configuration, check_exchange, validate_config_consistency
from freqtrade.configuration.config_validation import validate_config_schema
from freqtrade.configuration.deprecated_settings import (check_conflicting_settings,
                                                         process_deprecated_setting,
                                                         process_removed_setting,
                                                         process_temporary_deprecated_settings)
from freqtrade.configuration.environment_vars import flat_vars_to_nested_dict
from freqtrade.configuration.load_config import load_config_file, load_file, log_config_error_range
from freqtrade.constants import DEFAULT_DB_DRYRUN_URL, DEFAULT_DB_PROD_URL, ENV_VAR_PREFIX
from freqtrade.enums import RunMode
from freqtrade.exceptions import OperationalException
from freqtrade.loggers import FTBufferingHandler, _set_loggers, setup_logging, setup_logging_pre
from tests.conftest import (CURRENT_TEST_STRATEGY, log_has, log_has_re,
                            patched_configuration_load_config_file)


@pytest.fixture(scope="function")
def all_conf():
    config_file = Path(__file__).parents[1] / "config_examples/config_full.example.json"
    conf = load_config_file(str(config_file))
    return conf


def test_load_config_missing_attributes(default_conf) -> None:
    conf = deepcopy(default_conf)
    conf.pop('exchange')

    with pytest.raises(ValidationError, match=r".*'exchange' is a required property.*"):
        validate_config_schema(conf)

    conf = deepcopy(default_conf)
    conf.pop('stake_currency')
    conf['runmode'] = RunMode.DRY_RUN
    with pytest.raises(ValidationError, match=r".*'stake_currency' is a required property.*"):
        validate_config_schema(conf)


def test_load_config_incorrect_stake_amount(default_conf) -> None:
    default_conf['stake_amount'] = 'fake'

    with pytest.raises(ValidationError, match=r".*'fake' does not match 'unlimited'.*"):
        validate_config_schema(default_conf)


def test_load_config_file(default_conf, mocker, caplog) -> None:
    del default_conf['user_data_dir']
    file_mock = mocker.patch('freqtrade.configuration.load_config.open', mocker.mock_open(
        read_data=json.dumps(default_conf)
    ))

    validated_conf = load_config_file('somefile')
    assert file_mock.call_count == 1
    assert validated_conf.items() >= default_conf.items()


def test_load_config_file_error(default_conf, mocker, caplog) -> None:
    del default_conf['user_data_dir']
    filedata = json.dumps(default_conf).replace(
        '"stake_amount": 0.001,', '"stake_amount": .001,')
    mocker.patch('freqtrade.configuration.load_config.open', mocker.mock_open(read_data=filedata))
    mocker.patch.object(Path, "read_text", MagicMock(return_value=filedata))

    with pytest.raises(OperationalException, match=r".*Please verify the following segment.*"):
        load_config_file('somefile')


def test_load_config_file_error_range(default_conf, mocker, caplog) -> None:
    del default_conf['user_data_dir']
    filedata = json.dumps(default_conf).replace(
        '"stake_amount": 0.001,', '"stake_amount": .001,')
    mocker.patch.object(Path, "read_text", MagicMock(return_value=filedata))

    x = log_config_error_range('somefile', 'Parse error at offset 64: Invalid value.')
    assert isinstance(x, str)
    assert (x == '{"max_open_trades": 1, "stake_currency": "BTC", '
            '"stake_amount": .001, "fiat_display_currency": "USD", '
            '"timeframe": "5m", "dry_run": true, "cance')

    filedata = json.dumps(default_conf, indent=2).replace(
        '"stake_amount": 0.001,', '"stake_amount": .001,')
    mocker.patch.object(Path, "read_text", MagicMock(return_value=filedata))

    x = log_config_error_range('somefile', 'Parse error at offset 4: Invalid value.')
    assert isinstance(x, str)
    assert (x == '  "max_open_trades": 1,\n  "stake_currency": "BTC",\n'
            '  "stake_amount": .001,')

    x = log_config_error_range('-', '')
    assert x == ''


def test_load_file_error(tmpdir):
    testpath = Path(tmpdir) / 'config.json'
    with pytest.raises(OperationalException, match=r"File .* not found!"):
        load_file(testpath)


def test__args_to_config(caplog):

    arg_list = ['trade', '--strategy-path', 'TestTest']
    args = Arguments(arg_list).get_parsed_arg()
    configuration = Configuration(args)
    config = {}
    with warnings.catch_warnings(record=True) as w:
        warnings.simplefilter("always")
        # No warnings ...
        configuration._args_to_config(config, argname="strategy_path", logstring="DeadBeef")
        assert len(w) == 0
        assert log_has("DeadBeef", caplog)
        assert config['strategy_path'] == "TestTest"

    configuration = Configuration(args)
    config = {}
    with warnings.catch_warnings(record=True) as w:
        warnings.simplefilter("always")
        # Deprecation warnings!
        configuration._args_to_config(config, argname="strategy_path", logstring="DeadBeef",
                                      deprecated_msg="Going away soon!")
        assert len(w) == 1
        assert issubclass(w[-1].category, DeprecationWarning)
        assert "DEPRECATED: Going away soon!" in str(w[-1].message)
        assert log_has("DeadBeef", caplog)
        assert config['strategy_path'] == "TestTest"


def test_load_config_max_open_trades_zero(default_conf, mocker, caplog) -> None:
    default_conf['max_open_trades'] = 0
    patched_configuration_load_config_file(mocker, default_conf)

    args = Arguments(['trade']).get_parsed_arg()
    configuration = Configuration(args)
    validated_conf = configuration.load_config()

    assert validated_conf['max_open_trades'] == 0
    assert 'internals' in validated_conf


def test_load_config_combine_dicts(default_conf, mocker, caplog) -> None:
    conf1 = deepcopy(default_conf)
    conf2 = deepcopy(default_conf)
    del conf1['exchange']['key']
    del conf1['exchange']['secret']
    del conf2['exchange']['name']
    conf2['exchange']['pair_whitelist'] += ['NANO/BTC']

    config_files = [conf1, conf2]

    configsmock = MagicMock(side_effect=config_files)
    mocker.patch(
        'freqtrade.configuration.configuration.load_config_file',
        configsmock
    )

    arg_list = ['trade', '-c', 'test_conf.json', '--config', 'test2_conf.json', ]
    args = Arguments(arg_list).get_parsed_arg()
    configuration = Configuration(args)
    validated_conf = configuration.load_config()

    exchange_conf = default_conf['exchange']
    assert validated_conf['exchange']['name'] == exchange_conf['name']
    assert validated_conf['exchange']['key'] == exchange_conf['key']
    assert validated_conf['exchange']['secret'] == exchange_conf['secret']
    assert validated_conf['exchange']['pair_whitelist'] != conf1['exchange']['pair_whitelist']
    assert validated_conf['exchange']['pair_whitelist'] == conf2['exchange']['pair_whitelist']

    assert 'internals' in validated_conf


def test_from_config(default_conf, mocker, caplog) -> None:
    conf1 = deepcopy(default_conf)
    conf2 = deepcopy(default_conf)
    del conf1['exchange']['key']
    del conf1['exchange']['secret']
    del conf2['exchange']['name']
    conf2['exchange']['pair_whitelist'] += ['NANO/BTC']
    conf2['fiat_display_currency'] = "EUR"
    config_files = [conf1, conf2]
    mocker.patch('freqtrade.configuration.configuration.create_datadir', lambda c, x: x)

    configsmock = MagicMock(side_effect=config_files)
    mocker.patch('freqtrade.configuration.configuration.load_config_file', configsmock)

    validated_conf = Configuration.from_files(['test_conf.json', 'test2_conf.json'])

    exchange_conf = default_conf['exchange']
    assert validated_conf['exchange']['name'] == exchange_conf['name']
    assert validated_conf['exchange']['key'] == exchange_conf['key']
    assert validated_conf['exchange']['secret'] == exchange_conf['secret']
    assert validated_conf['exchange']['pair_whitelist'] != conf1['exchange']['pair_whitelist']
    assert validated_conf['exchange']['pair_whitelist'] == conf2['exchange']['pair_whitelist']
    assert validated_conf['fiat_display_currency'] == "EUR"
    assert 'internals' in validated_conf
    assert isinstance(validated_conf['user_data_dir'], Path)


def test_print_config(default_conf, mocker, caplog) -> None:
    conf1 = deepcopy(default_conf)
    # Delete non-json elements from default_conf
    del conf1['user_data_dir']
    config_files = [conf1]

    configsmock = MagicMock(side_effect=config_files)
    mocker.patch('freqtrade.configuration.configuration.create_datadir', lambda c, x: x)
    mocker.patch('freqtrade.configuration.configuration.load_config_file', configsmock)

    validated_conf = Configuration.from_files(['test_conf.json'])

    assert isinstance(validated_conf['user_data_dir'], Path)
    assert "user_data_dir" in validated_conf
    assert "original_config" in validated_conf
    assert isinstance(json.dumps(validated_conf['original_config']), str)


def test_load_config_max_open_trades_minus_one(default_conf, mocker, caplog) -> None:
    default_conf['max_open_trades'] = -1
    patched_configuration_load_config_file(mocker, default_conf)

    args = Arguments(['trade']).get_parsed_arg()
    configuration = Configuration(args)
    validated_conf = configuration.load_config()

    assert validated_conf['max_open_trades'] > 999999999
    assert validated_conf['max_open_trades'] == float('inf')
    assert "runmode" in validated_conf
    assert validated_conf['runmode'] == RunMode.DRY_RUN


def test_load_config_file_exception(mocker) -> None:
    mocker.patch(
        'freqtrade.configuration.configuration.open',
        MagicMock(side_effect=FileNotFoundError('File not found'))
    )

    with pytest.raises(OperationalException, match=r'.*Config file "somefile" not found!*'):
        load_config_file('somefile')


def test_load_config(default_conf, mocker) -> None:
    del default_conf['strategy_path']
    patched_configuration_load_config_file(mocker, default_conf)

    args = Arguments(['trade']).get_parsed_arg()
    configuration = Configuration(args)
    validated_conf = configuration.load_config()

    assert validated_conf.get('strategy_path') is None
    assert 'edge' not in validated_conf


def test_load_config_with_params(default_conf, mocker) -> None:
    patched_configuration_load_config_file(mocker, default_conf)

    arglist = [
        'trade',
        '--strategy', 'TestStrategy',
        '--strategy-path', '/some/path',
        '--db-url', 'sqlite:///someurl',
    ]
    args = Arguments(arglist).get_parsed_arg()
    configuration = Configuration(args)
    validated_conf = configuration.load_config()

    assert validated_conf.get('strategy') == 'TestStrategy'
    assert validated_conf.get('strategy_path') == '/some/path'
    assert validated_conf.get('db_url') == 'sqlite:///someurl'

    # Test conf provided db_url prod
    conf = default_conf.copy()
    conf["dry_run"] = False
    conf["db_url"] = "sqlite:///path/to/db.sqlite"
    patched_configuration_load_config_file(mocker, conf)

    arglist = [
        'trade',
        '--strategy', 'TestStrategy',
        '--strategy-path', '/some/path'
    ]
    args = Arguments(arglist).get_parsed_arg()

    configuration = Configuration(args)
    validated_conf = configuration.load_config()
    assert validated_conf.get('db_url') == "sqlite:///path/to/db.sqlite"

    # Test conf provided db_url dry_run
    conf = default_conf.copy()
    conf["dry_run"] = True
    conf["db_url"] = "sqlite:///path/to/db.sqlite"
    patched_configuration_load_config_file(mocker, conf)

    arglist = [
        'trade',
        '--strategy', 'TestStrategy',
        '--strategy-path', '/some/path'
    ]
    args = Arguments(arglist).get_parsed_arg()

    configuration = Configuration(args)
    validated_conf = configuration.load_config()
    assert validated_conf.get('db_url') == "sqlite:///path/to/db.sqlite"

    # Test args provided db_url prod
    conf = default_conf.copy()
    conf["dry_run"] = False
    del conf["db_url"]
    patched_configuration_load_config_file(mocker, conf)

    arglist = [
        'trade',
        '--strategy', 'TestStrategy',
        '--strategy-path', '/some/path'
    ]
    args = Arguments(arglist).get_parsed_arg()

    configuration = Configuration(args)
    validated_conf = configuration.load_config()
    assert validated_conf.get('db_url') == DEFAULT_DB_PROD_URL
    assert "runmode" in validated_conf
    assert validated_conf['runmode'] == RunMode.LIVE

    # Test args provided db_url dry_run
    conf = default_conf.copy()
    conf["dry_run"] = True
    conf["db_url"] = DEFAULT_DB_PROD_URL
    patched_configuration_load_config_file(mocker, conf)

    arglist = [
        'trade',
        '--strategy', 'TestStrategy',
        '--strategy-path', '/some/path'
    ]
    args = Arguments(arglist).get_parsed_arg()

    configuration = Configuration(args)
    validated_conf = configuration.load_config()
    assert validated_conf.get('db_url') == DEFAULT_DB_DRYRUN_URL


@pytest.mark.parametrize("config_value,expected,arglist", [
    (True, True, ['trade', '--dry-run']),  # Leave config untouched
    (False, True, ['trade', '--dry-run']),  # Override config untouched
    (False, False, ['trade']),  # Leave config untouched
    (True, True, ['trade']),  # Leave config untouched
])
def test_load_dry_run(default_conf, mocker, config_value, expected, arglist) -> None:

    default_conf['dry_run'] = config_value
    patched_configuration_load_config_file(mocker, default_conf)

    configuration = Configuration(Arguments(arglist).get_parsed_arg())
    validated_conf = configuration.load_config()

    assert validated_conf['dry_run'] is expected
    assert validated_conf['runmode'] == (RunMode.DRY_RUN if expected else RunMode.LIVE)


def test_load_custom_strategy(default_conf, mocker) -> None:
    default_conf.update({
        'strategy': 'CustomStrategy',
        'strategy_path': '/tmp/strategies',
    })
    patched_configuration_load_config_file(mocker, default_conf)

    args = Arguments(['trade']).get_parsed_arg()
    configuration = Configuration(args)
    validated_conf = configuration.load_config()

    assert validated_conf.get('strategy') == 'CustomStrategy'
    assert validated_conf.get('strategy_path') == '/tmp/strategies'


def test_show_info(default_conf, mocker, caplog) -> None:
    patched_configuration_load_config_file(mocker, default_conf)

    arglist = [
        'trade',
        '--strategy', 'TestStrategy',
        '--db-url', 'sqlite:///tmp/testdb',
    ]
    args = Arguments(arglist).get_parsed_arg()

    configuration = Configuration(args)
    configuration.get_config()

    assert log_has('Using DB: "sqlite:///tmp/testdb"', caplog)
    assert log_has('Dry run is enabled', caplog)


def test_setup_configuration_without_arguments(mocker, default_conf, caplog) -> None:
    patched_configuration_load_config_file(mocker, default_conf)

    arglist = [
        'backtesting',
        '--config', 'config.json',
        '--strategy', CURRENT_TEST_STRATEGY,
    ]

    args = Arguments(arglist).get_parsed_arg()

    configuration = Configuration(args)
    config = configuration.get_config()
    assert 'max_open_trades' in config
    assert 'stake_currency' in config
    assert 'stake_amount' in config
    assert 'exchange' in config
    assert 'pair_whitelist' in config['exchange']
    assert 'datadir' in config
    assert 'user_data_dir' in config
    assert log_has('Using data directory: {} ...'.format(config['datadir']), caplog)
    assert 'timeframe' in config
    assert not log_has('Parameter -i/--timeframe detected ...', caplog)

    assert 'position_stacking' not in config
    assert not log_has('Parameter --enable-position-stacking detected ...', caplog)

    assert 'timerange' not in config


def test_setup_configuration_with_arguments(mocker, default_conf, caplog) -> None:
    patched_configuration_load_config_file(mocker, default_conf)
    mocker.patch(
        'freqtrade.configuration.configuration.create_datadir',
        lambda c, x: x
    )
    mocker.patch(
        'freqtrade.configuration.configuration.create_userdata_dir',
        lambda x, *args, **kwargs: Path(x)
    )
    arglist = [
        'backtesting',
        '--config', 'config.json',
        '--strategy', CURRENT_TEST_STRATEGY,
        '--datadir', '/foo/bar',
        '--userdir', "/tmp/freqtrade",
        '--timeframe', '1m',
        '--enable-position-stacking',
        '--disable-max-market-positions',
        '--timerange', ':100',
        '--export', 'trades',
        '--stake-amount', 'unlimited'
    ]

    args = Arguments(arglist).get_parsed_arg()

    configuration = Configuration(args)
    config = configuration.get_config()
    assert 'max_open_trades' in config
    assert 'stake_currency' in config
    assert 'stake_amount' in config
    assert 'exchange' in config
    assert 'pair_whitelist' in config['exchange']
    assert 'datadir' in config
    assert log_has('Using data directory: {} ...'.format("/foo/bar"), caplog)
    assert log_has('Using user-data directory: {} ...'.format(Path("/tmp/freqtrade")), caplog)
    assert 'user_data_dir' in config

    assert 'timeframe' in config
    assert log_has('Parameter -i/--timeframe detected ... Using timeframe: 1m ...',
                   caplog)

    assert 'position_stacking' in config
    assert log_has('Parameter --enable-position-stacking detected ...', caplog)

    assert 'use_max_market_positions' in config
    assert log_has('Parameter --disable-max-market-positions detected ...', caplog)
    assert log_has('max_open_trades set to unlimited ...', caplog)

    assert 'timerange' in config
    assert log_has('Parameter --timerange detected: {} ...'.format(config['timerange']), caplog)

    assert 'export' in config
    assert log_has('Parameter --export detected: {} ...'.format(config['export']), caplog)
    assert 'stake_amount' in config
    assert config['stake_amount'] == 'unlimited'


def test_setup_configuration_with_stratlist(mocker, default_conf, caplog) -> None:
    """
    Test setup_configuration() function
    """
    patched_configuration_load_config_file(mocker, default_conf)

    arglist = [
        'backtesting',
        '--config', 'config.json',
        '--timeframe', '1m',
        '--export', 'trades',
        '--strategy-list',
        CURRENT_TEST_STRATEGY,
        'TestStrategy'
    ]

    args = Arguments(arglist).get_parsed_arg()

    configuration = Configuration(args, RunMode.BACKTEST)
    config = configuration.get_config()
    assert config['runmode'] == RunMode.BACKTEST
    assert 'max_open_trades' in config
    assert 'stake_currency' in config
    assert 'stake_amount' in config
    assert 'exchange' in config
    assert 'pair_whitelist' in config['exchange']
    assert 'datadir' in config
    assert log_has('Using data directory: {} ...'.format(config['datadir']), caplog)
    assert 'timeframe' in config
    assert log_has('Parameter -i/--timeframe detected ... Using timeframe: 1m ...',
                   caplog)

    assert 'strategy_list' in config
    assert log_has('Using strategy list of 2 strategies', caplog)

    assert 'position_stacking' not in config

    assert 'use_max_market_positions' not in config

    assert 'timerange' not in config

    assert 'export' in config
    assert log_has('Parameter --export detected: {} ...'.format(config['export']), caplog)


def test_hyperopt_with_arguments(mocker, default_conf, caplog) -> None:
    patched_configuration_load_config_file(mocker, default_conf)

    arglist = [
        'hyperopt',
        '--epochs', '10',
        '--spaces', 'all',
    ]
    args = Arguments(arglist).get_parsed_arg()

    configuration = Configuration(args, RunMode.HYPEROPT)
    config = configuration.get_config()

    assert 'epochs' in config
    assert int(config['epochs']) == 10
    assert log_has('Parameter --epochs detected ... Will run Hyperopt with for 10 epochs ...',
                   caplog)

    assert 'spaces' in config
    assert config['spaces'] == ['all']
    assert log_has("Parameter -s/--spaces detected: ['all']", caplog)
    assert "runmode" in config
    assert config['runmode'] == RunMode.HYPEROPT


def test_check_exchange(default_conf, caplog) -> None:
    # Test an officially supported by Freqtrade team exchange
    default_conf['runmode'] = RunMode.DRY_RUN
    default_conf.get('exchange').update({'name': 'BITTREX'})
    assert check_exchange(default_conf)
    assert log_has_re(r"Exchange .* is officially supported by the Freqtrade development team\.",
                      caplog)
    caplog.clear()

    # Test an officially supported by Freqtrade team exchange
    default_conf.get('exchange').update({'name': 'binance'})
    assert check_exchange(default_conf)
    assert log_has_re(r"Exchange .* is officially supported by the Freqtrade development team\.",
                      caplog)
    caplog.clear()

    # Test an available exchange, supported by ccxt
    default_conf.get('exchange').update({'name': 'huobipro'})
    assert check_exchange(default_conf)
    assert log_has_re(r"Exchange .* is known to the the ccxt library, available for the bot, "
                      r"but not officially supported "
                      r"by the Freqtrade development team\. .*", caplog)
    caplog.clear()

    # Test a 'bad' exchange, which known to have serious problems
    default_conf.get('exchange').update({'name': 'bitmex'})
    with pytest.raises(OperationalException,
                       match=r"Exchange .* will not work with Freqtrade\..*"):
        check_exchange(default_conf)
    caplog.clear()

    # Test a 'bad' exchange with check_for_bad=False
    default_conf.get('exchange').update({'name': 'bitmex'})
    assert check_exchange(default_conf, False)
    assert log_has_re(r"Exchange .* is known to the the ccxt library, available for the bot, "
                      r"but not officially supported "
                      r"by the Freqtrade development team\. .*", caplog)
    caplog.clear()

    # Test an invalid exchange
    default_conf.get('exchange').update({'name': 'unknown_exchange'})
    with pytest.raises(
        OperationalException,
        match=r'Exchange "unknown_exchange" is not known to the ccxt library '
              r'and therefore not available for the bot.*'
    ):
        check_exchange(default_conf)

    # Test no exchange...
    default_conf.get('exchange').update({'name': ''})
    default_conf['runmode'] = RunMode.PLOT
    assert check_exchange(default_conf)

    # Test no exchange...
    default_conf.get('exchange').update({'name': ''})
    default_conf['runmode'] = RunMode.UTIL_EXCHANGE
    with pytest.raises(OperationalException,
                       match=r'This command requires a configured exchange.*'):
        check_exchange(default_conf)


def test_cli_verbose_with_params(default_conf, mocker, caplog) -> None:
    patched_configuration_load_config_file(mocker, default_conf)

    # Prevent setting loggers
    mocker.patch('freqtrade.loggers._set_loggers', MagicMock)
    arglist = ['trade', '-vvv']
    args = Arguments(arglist).get_parsed_arg()

    configuration = Configuration(args)
    validated_conf = configuration.load_config()

    assert validated_conf.get('verbosity') == 3
    assert log_has('Verbosity set to 3', caplog)


def test_set_loggers() -> None:
    # Reset Logging to Debug, otherwise this fails randomly as it's set globally
    logging.getLogger('requests').setLevel(logging.DEBUG)
    logging.getLogger("urllib3").setLevel(logging.DEBUG)
    logging.getLogger('ccxt.base.exchange').setLevel(logging.DEBUG)
    logging.getLogger('telegram').setLevel(logging.DEBUG)

    previous_value1 = logging.getLogger('requests').level
    previous_value2 = logging.getLogger('ccxt.base.exchange').level
    previous_value3 = logging.getLogger('telegram').level

    _set_loggers()

    value1 = logging.getLogger('requests').level
    assert previous_value1 is not value1
    assert value1 is logging.INFO

    value2 = logging.getLogger('ccxt.base.exchange').level
    assert previous_value2 is not value2
    assert value2 is logging.INFO

    value3 = logging.getLogger('telegram').level
    assert previous_value3 is not value3
    assert value3 is logging.INFO

    _set_loggers(verbosity=2)

    assert logging.getLogger('requests').level is logging.DEBUG
    assert logging.getLogger('ccxt.base.exchange').level is logging.INFO
    assert logging.getLogger('telegram').level is logging.INFO
    assert logging.getLogger('werkzeug').level is logging.INFO

    _set_loggers(verbosity=3, api_verbosity='error')

    assert logging.getLogger('requests').level is logging.DEBUG
    assert logging.getLogger('ccxt.base.exchange').level is logging.DEBUG
    assert logging.getLogger('telegram').level is logging.INFO
    assert logging.getLogger('werkzeug').level is logging.ERROR


@pytest.mark.skipif(sys.platform == "win32", reason="does not run on windows")
def test_set_loggers_syslog():
    logger = logging.getLogger()
    orig_handlers = logger.handlers
    logger.handlers = []

    config = {'verbosity': 2,
              'logfile': 'syslog:/dev/log',
              }

    setup_logging_pre()
    setup_logging(config)
    assert len(logger.handlers) == 3
    assert [x for x in logger.handlers if type(x) == logging.handlers.SysLogHandler]
    assert [x for x in logger.handlers if type(x) == logging.StreamHandler]
    assert [x for x in logger.handlers if type(x) == FTBufferingHandler]
    # setting up logging again should NOT cause the loggers to be added a second time.
    setup_logging(config)
    assert len(logger.handlers) == 3
    # reset handlers to not break pytest
    logger.handlers = orig_handlers


@pytest.mark.skipif(sys.platform == "win32", reason="does not run on windows")
def test_set_loggers_Filehandler(tmpdir):
    logger = logging.getLogger()
    orig_handlers = logger.handlers
    logger.handlers = []
    logfile = Path(tmpdir) / 'ft_logfile.log'
    config = {'verbosity': 2,
              'logfile': str(logfile),
              }

    setup_logging_pre()
    setup_logging(config)
    assert len(logger.handlers) == 3
    assert [x for x in logger.handlers if type(x) == logging.handlers.RotatingFileHandler]
    assert [x for x in logger.handlers if type(x) == logging.StreamHandler]
    assert [x for x in logger.handlers if type(x) == FTBufferingHandler]
    # setting up logging again should NOT cause the loggers to be added a second time.
    setup_logging(config)
    assert len(logger.handlers) == 3
    # reset handlers to not break pytest
    if logfile.exists:
        logfile.unlink()
    logger.handlers = orig_handlers


@pytest.mark.skip(reason="systemd is not installed on every system, so we're not testing this.")
def test_set_loggers_journald(mocker):
    logger = logging.getLogger()
    orig_handlers = logger.handlers
    logger.handlers = []

    config = {'verbosity': 2,
              'logfile': 'journald',
              }

    setup_logging(config)
    assert len(logger.handlers) == 2
    assert [x for x in logger.handlers if type(x).__name__ == "JournaldLogHandler"]
    assert [x for x in logger.handlers if type(x) == logging.StreamHandler]
    # reset handlers to not break pytest
    logger.handlers = orig_handlers


def test_set_loggers_journald_importerror(mocker, import_fails):
    logger = logging.getLogger()
    orig_handlers = logger.handlers
    logger.handlers = []

    config = {'verbosity': 2,
              'logfile': 'journald',
              }
    with pytest.raises(OperationalException,
                       match=r'You need the systemd python package.*'):
        setup_logging(config)
    logger.handlers = orig_handlers


def test_set_logfile(default_conf, mocker, tmpdir):
    patched_configuration_load_config_file(mocker, default_conf)
    f = Path(tmpdir / "test_file.log")
    assert not f.is_file()
    arglist = [
        'trade', '--logfile', str(f),
    ]
    args = Arguments(arglist).get_parsed_arg()
    configuration = Configuration(args)
    validated_conf = configuration.load_config()

    assert validated_conf['logfile'] == str(f)
    assert f.is_file()
    try:
        f.unlink()
    except Exception:
        pass


def test_load_config_warn_forcebuy(default_conf, mocker, caplog) -> None:
    default_conf['forcebuy_enable'] = True
    patched_configuration_load_config_file(mocker, default_conf)

    args = Arguments(['trade']).get_parsed_arg()
    configuration = Configuration(args)
    validated_conf = configuration.load_config()

    assert validated_conf.get('forcebuy_enable')
    assert log_has('`forcebuy` RPC message enabled.', caplog)


def test_validate_default_conf(default_conf) -> None:
    # Validate via our validator - we allow setting defaults!
    validate_config_schema(default_conf)


def test_validate_max_open_trades(default_conf):
    default_conf['max_open_trades'] = float('inf')
    default_conf['stake_amount'] = 'unlimited'
    with pytest.raises(OperationalException, match='`max_open_trades` and `stake_amount` '
                                                   'cannot both be unlimited.'):
        validate_config_consistency(default_conf)


def test_validate_price_side(default_conf):
    default_conf['order_types'] = {
        "entry": "limit",
        "exit": "limit",
        "stoploss": "limit",
        "stoploss_on_exchange": False,
    }
    # Default should pass
    validate_config_consistency(default_conf)

    conf = deepcopy(default_conf)
    conf['order_types']['entry'] = 'market'
    with pytest.raises(OperationalException,
                       match='Market buy orders require bid_strategy.price_side = "ask".'):
        validate_config_consistency(conf)

    conf = deepcopy(default_conf)
    conf['order_types']['exit'] = 'market'
    with pytest.raises(OperationalException,
                       match='Market sell orders require ask_strategy.price_side = "bid".'):
        validate_config_consistency(conf)

    # Validate inversed case
    conf = deepcopy(default_conf)
    conf['order_types']['exit'] = 'market'
    conf['order_types']['entry'] = 'market'
    conf['ask_strategy']['price_side'] = 'bid'
    conf['bid_strategy']['price_side'] = 'ask'

    validate_config_consistency(conf)


def test_validate_tsl(default_conf):
    default_conf['stoploss'] = 0.0
    with pytest.raises(OperationalException, match='The config stoploss needs to be different '
                                                   'from 0 to avoid problems with sell orders.'):
        validate_config_consistency(default_conf)
    default_conf['stoploss'] = -0.10

    default_conf['trailing_stop'] = True
    default_conf['trailing_stop_positive'] = 0
    default_conf['trailing_stop_positive_offset'] = 0

    default_conf['trailing_only_offset_is_reached'] = True
    with pytest.raises(OperationalException,
                       match=r'The config trailing_only_offset_is_reached needs '
                       'trailing_stop_positive_offset to be more than 0 in your config.'):
        validate_config_consistency(default_conf)

    default_conf['trailing_stop_positive_offset'] = 0.01
    default_conf['trailing_stop_positive'] = 0.015
    with pytest.raises(OperationalException,
                       match=r'The config trailing_stop_positive_offset needs '
                       'to be greater than trailing_stop_positive in your config.'):
        validate_config_consistency(default_conf)

    default_conf['trailing_stop_positive'] = 0.01
    default_conf['trailing_stop_positive_offset'] = 0.015
    validate_config_consistency(default_conf)

    # 0 trailing stop positive - results in "Order would trigger immediately"
    default_conf['trailing_stop_positive'] = 0
    default_conf['trailing_stop_positive_offset'] = 0.02
    default_conf['trailing_only_offset_is_reached'] = False
    with pytest.raises(OperationalException,
                       match='The config trailing_stop_positive needs to be different from 0 '
                       'to avoid problems with sell orders'):
        validate_config_consistency(default_conf)


def test_validate_edge2(edge_conf):
    edge_conf.update({
        "use_sell_signal": True,
    })
    # Passes test
    validate_config_consistency(edge_conf)

    edge_conf.update({
        "use_sell_signal": False,
    })
    with pytest.raises(OperationalException, match="Edge requires `use_sell_signal` to be True, "
                       "otherwise no sells will happen."):
        validate_config_consistency(edge_conf)


def test_validate_whitelist(default_conf):
    default_conf['runmode'] = RunMode.DRY_RUN
    # Test regular case - has whitelist and uses StaticPairlist
    validate_config_consistency(default_conf)
    conf = deepcopy(default_conf)
    del conf['exchange']['pair_whitelist']
    # Test error case
    with pytest.raises(OperationalException,
                       match="StaticPairList requires pair_whitelist to be set."):

        validate_config_consistency(conf)

    conf = deepcopy(default_conf)

    conf.update({"pairlists": [{
        "method": "VolumePairList",
    }]})
    # Dynamic whitelist should not care about pair_whitelist
    validate_config_consistency(conf)
    del conf['exchange']['pair_whitelist']

    validate_config_consistency(conf)


@pytest.mark.parametrize('protconf,expected', [
    ([], None),
    ([{"method": "StoplossGuard", "lookback_period": 2000, "stop_duration_candles": 10}], None),
    ([{"method": "StoplossGuard", "lookback_period_candles": 20, "stop_duration": 10}], None),
    ([{"method": "StoplossGuard", "lookback_period_candles": 20, "lookback_period": 2000,
       "stop_duration": 10}], r'Protections must specify either `lookback_period`.*'),
    ([{"method": "StoplossGuard", "lookback_period": 20, "stop_duration": 10,
       "stop_duration_candles": 10}], r'Protections must specify either `stop_duration`.*'),
])
def test_validate_protections(default_conf, protconf, expected):
    conf = deepcopy(default_conf)
    conf['protections'] = protconf
    if expected:
        with pytest.raises(OperationalException, match=expected):
            validate_config_consistency(conf)
    else:
        validate_config_consistency(conf)


def test_validate_ask_orderbook(default_conf, caplog) -> None:
    conf = deepcopy(default_conf)
    conf['ask_strategy']['use_order_book'] = True
    conf['ask_strategy']['order_book_min'] = 2
    conf['ask_strategy']['order_book_max'] = 2

    validate_config_consistency(conf)
    assert log_has_re(r"DEPRECATED: Please use `order_book_top` instead of.*", caplog)
    assert conf['ask_strategy']['order_book_top'] == 2

    conf['ask_strategy']['order_book_max'] = 5

    with pytest.raises(OperationalException,
                       match=r"Using order_book_max != order_book_min in ask_strategy.*"):
        validate_config_consistency(conf)


def test_validate_time_in_force(default_conf, caplog) -> None:
    conf = deepcopy(default_conf)
    conf['order_time_in_force'] = {
        'buy': 'gtc',
        'sell': 'gtc',
    }
    validate_config_consistency(conf)
    assert log_has_re(r"DEPRECATED: Using 'buy' and 'sell' for time_in_force is.*", caplog)
    assert conf['order_time_in_force']['entry'] == 'gtc'
    assert conf['order_time_in_force']['exit'] == 'gtc'

    conf = deepcopy(default_conf)
    conf['order_time_in_force'] = {
        'buy': 'gtc',
        'sell': 'gtc',
    }
    conf['trading_mode'] = 'futures'
    with pytest.raises(OperationalException,
                       match=r"Please migrate your time_in_force settings .* 'entry' and 'exit'\."):
        validate_config_consistency(conf)


def test_validate_order_types(default_conf, caplog) -> None:
    conf = deepcopy(default_conf)
    conf['order_types'] = {
        'buy': 'limit',
        'sell': 'market',
        'forcesell': 'market',
        'forcebuy': 'limit',
        'stoploss': 'market',
        'stoploss_on_exchange': False,
    }
    validate_config_consistency(conf)
    assert log_has_re(r"DEPRECATED: Using 'buy' and 'sell' for order_types is.*", caplog)
    assert conf['order_types']['entry'] == 'limit'
    assert conf['order_types']['exit'] == 'market'
    assert conf['order_types']['forceentry'] == 'limit'
    assert 'buy' not in conf['order_types']
    assert 'sell' not in conf['order_types']
    assert 'forcebuy' not in conf['order_types']
    assert 'forcesell' not in conf['order_types']

    conf = deepcopy(default_conf)
    conf['order_types'] = {
        'buy': 'limit',
        'sell': 'market',
        'forcesell': 'market',
        'forcebuy': 'limit',
        'stoploss': 'market',
        'stoploss_on_exchange': False,
    }
    conf['trading_mode'] = 'futures'
    with pytest.raises(OperationalException,
                       match=r"Please migrate your order_types settings to use the new wording\."):
        validate_config_consistency(conf)


def test_load_config_test_comments() -> None:
    """
    Load config with comments
    """
    config_file = Path(__file__).parents[0] / "config_test_comments.json"
    conf = load_config_file(str(config_file))

    assert conf


def test_load_config_default_exchange(all_conf) -> None:
    """
    config['exchange'] subtree has required options in it
    so it cannot be omitted in the config
    """
    del all_conf['exchange']

    assert 'exchange' not in all_conf

    with pytest.raises(ValidationError,
                       match=r"'exchange' is a required property"):
        validate_config_schema(all_conf)


def test_load_config_default_exchange_name(all_conf) -> None:
    """
    config['exchange']['name'] option is required
    so it cannot be omitted in the config
    """
    del all_conf['exchange']['name']

    assert 'name' not in all_conf['exchange']

    with pytest.raises(ValidationError,
                       match=r"'name' is a required property"):
        validate_config_schema(all_conf)


def test_load_config_stoploss_exchange_limit_ratio(all_conf) -> None:
    all_conf['order_types']['stoploss_on_exchange_limit_ratio'] = 1.15

    with pytest.raises(ValidationError,
                       match=r"1.15 is greater than the maximum"):
        validate_config_schema(all_conf)


@pytest.mark.parametrize("keys", [("exchange", "sandbox", False),
                                  ("exchange", "key", ""),
                                  ("exchange", "secret", ""),
                                  ("exchange", "password", ""),
                                  ])
def test_load_config_default_subkeys(all_conf, keys) -> None:
    """
    Test for parameters with default values in sub-paths
    so they can be omitted in the config and the default value
    should is added to the config.
    """
    # Get first level key
    key = keys[0]
    # get second level key
    subkey = keys[1]

    del all_conf[key][subkey]

    assert subkey not in all_conf[key]

    validate_config_schema(all_conf)
    assert subkey in all_conf[key]
    assert all_conf[key][subkey] == keys[2]


def test_pairlist_resolving():
    arglist = [
        'download-data',
        '--pairs', 'ETH/BTC', 'XRP/BTC',
        '--exchange', 'binance'
    ]

    args = Arguments(arglist).get_parsed_arg()

    configuration = Configuration(args, RunMode.OTHER)
    config = configuration.get_config()

    assert config['pairs'] == ['ETH/BTC', 'XRP/BTC']
    assert config['exchange']['pair_whitelist'] == ['ETH/BTC', 'XRP/BTC']
    assert config['exchange']['name'] == 'binance'


def test_pairlist_resolving_with_config(mocker, default_conf):
    patched_configuration_load_config_file(mocker, default_conf)
    arglist = [
        'download-data',
        '--config', 'config.json',
    ]

    args = Arguments(arglist).get_parsed_arg()

    configuration = Configuration(args)
    config = configuration.get_config()

    assert config['pairs'] == default_conf['exchange']['pair_whitelist']
    assert config['exchange']['name'] == default_conf['exchange']['name']

    # Override pairs
    arglist = [
        'download-data',
        '--config', 'config.json',
        '--pairs', 'ETH/BTC', 'XRP/BTC',
    ]

    args = Arguments(arglist).get_parsed_arg()

    configuration = Configuration(args)
    config = configuration.get_config()

    assert config['pairs'] == ['ETH/BTC', 'XRP/BTC']
    assert config['exchange']['name'] == default_conf['exchange']['name']


def test_pairlist_resolving_with_config_pl(mocker, default_conf):
    patched_configuration_load_config_file(mocker, default_conf)

    arglist = [
        'download-data',
        '--config', 'config.json',
        '--pairs-file', 'tests/testdata/pairs.json',
    ]

    args = Arguments(arglist).get_parsed_arg()

    configuration = Configuration(args)
    config = configuration.get_config()
    assert len(config['pairs']) == 23
    assert 'ETH/BTC' in config['pairs']
    assert 'XRP/BTC' in config['pairs']
    assert config['exchange']['name'] == default_conf['exchange']['name']


def test_pairlist_resolving_with_config_pl_not_exists(mocker, default_conf):
    patched_configuration_load_config_file(mocker, default_conf)

    arglist = [
        'download-data',
        '--config', 'config.json',
        '--pairs-file', 'tests/testdata/pairs_doesnotexist.json',
    ]

    args = Arguments(arglist).get_parsed_arg()

    with pytest.raises(OperationalException, match=r"No pairs file found with path.*"):
        configuration = Configuration(args)
        configuration.get_config()


def test_pairlist_resolving_fallback(mocker):
    mocker.patch.object(Path, "exists", MagicMock(return_value=True))
    mocker.patch.object(Path, "open", MagicMock(return_value=MagicMock()))
    mocker.patch("freqtrade.configuration.configuration.load_file",
                 MagicMock(return_value=['XRP/BTC', 'ETH/BTC']))
    arglist = [
        'download-data',
        '--exchange', 'binance'
    ]

    args = Arguments(arglist).get_parsed_arg()
    # Fix flaky tests if config.json exists
    args['config'] = None

    configuration = Configuration(args, RunMode.OTHER)
    config = configuration.get_config()

    assert config['pairs'] == ['ETH/BTC', 'XRP/BTC']
    assert config['exchange']['name'] == 'binance'
    assert config['datadir'] == Path.cwd() / "user_data/data/binance"


@pytest.mark.parametrize("setting", [
    ("ask_strategy", "use_sell_signal", True,
     None, "use_sell_signal", False),
    ("ask_strategy", "sell_profit_only", True,
     None, "sell_profit_only", False),
    ("ask_strategy", "sell_profit_offset", 0.1,
     None, "sell_profit_offset", 0.01),
    ("ask_strategy", "ignore_roi_if_buy_signal", True,
     None, "ignore_roi_if_buy_signal", False),
    ("ask_strategy", "ignore_buying_expired_candle_after", 5,
     None, "ignore_buying_expired_candle_after", 6),
])
def test_process_temporary_deprecated_settings(mocker, default_conf, setting, caplog):
    patched_configuration_load_config_file(mocker, default_conf)

    # Create sections for new and deprecated settings
    # (they may not exist in the config)
    default_conf[setting[0]] = {}
    default_conf[setting[3]] = {}

    # Assign deprecated setting
    default_conf[setting[0]][setting[1]] = setting[2]
    # Assign new setting
    if setting[3]:
        default_conf[setting[3]][setting[4]] = setting[5]
    else:
        default_conf[setting[4]] = setting[5]

    # New and deprecated settings are conflicting ones
    with pytest.raises(OperationalException, match=r'DEPRECATED'):
        process_temporary_deprecated_settings(default_conf)

    caplog.clear()

    # Delete new setting
    if setting[3]:
        del default_conf[setting[3]][setting[4]]
    else:
        del default_conf[setting[4]]

    process_temporary_deprecated_settings(default_conf)
    assert log_has_re('DEPRECATED', caplog)
    # The value of the new setting shall have been set to the
    # value of the deprecated one
    if setting[3]:
        assert default_conf[setting[3]][setting[4]] == setting[2]
    else:
        assert default_conf[setting[4]] == setting[2]


@pytest.mark.parametrize("setting", [
    ("experimental", "use_sell_signal", False),
    ("experimental", "sell_profit_only", True),
    ("experimental", "ignore_roi_if_buy_signal", True),
])
def test_process_removed_settings(mocker, default_conf, setting):
    patched_configuration_load_config_file(mocker, default_conf)

    # Create sections for new and deprecated settings
    # (they may not exist in the config)
    default_conf[setting[0]] = {}
    # Assign removed setting
    default_conf[setting[0]][setting[1]] = setting[2]

    # New and deprecated settings are conflicting ones
    with pytest.raises(OperationalException,
                       match=r'Setting .* has been moved'):
        process_temporary_deprecated_settings(default_conf)


def test_process_deprecated_setting_edge(mocker, edge_conf):
    patched_configuration_load_config_file(mocker, edge_conf)
    edge_conf.update({'edge': {
        'enabled': True,
        'capital_available_percentage': 0.5,
    }})

    with pytest.raises(OperationalException,
                       match=r"DEPRECATED.*Using 'edge.capital_available_percentage'*"):
        process_temporary_deprecated_settings(edge_conf)


def test_check_conflicting_settings(mocker, default_conf, caplog):
    patched_configuration_load_config_file(mocker, default_conf)

    # Create sections for new and deprecated settings
    # (they may not exist in the config)
    default_conf['sectionA'] = {}
    default_conf['sectionB'] = {}
    # Assign new setting
    default_conf['sectionA']['new_setting'] = 'valA'
    # Assign deprecated setting
    default_conf['sectionB']['deprecated_setting'] = 'valB'

    # New and deprecated settings are conflicting ones
    with pytest.raises(OperationalException, match=r'DEPRECATED'):
        check_conflicting_settings(default_conf,
                                   'sectionB', 'deprecated_setting',
                                   'sectionA', 'new_setting')

    caplog.clear()

    # Delete new setting (deprecated exists)
    del default_conf['sectionA']['new_setting']
    check_conflicting_settings(default_conf,
                               'sectionB', 'deprecated_setting',
                               'sectionA', 'new_setting')
    assert not log_has_re('DEPRECATED', caplog)
    assert 'new_setting' not in default_conf['sectionA']

    caplog.clear()

    # Assign new setting
    default_conf['sectionA']['new_setting'] = 'valA'
    # Delete deprecated setting
    del default_conf['sectionB']['deprecated_setting']
    check_conflicting_settings(default_conf,
                               'sectionB', 'deprecated_setting',
                               'sectionA', 'new_setting')
    assert not log_has_re('DEPRECATED', caplog)
    assert default_conf['sectionA']['new_setting'] == 'valA'


def test_process_deprecated_setting(mocker, default_conf, caplog):
    patched_configuration_load_config_file(mocker, default_conf)

    # Create sections for new and deprecated settings
    # (they may not exist in the config)
    default_conf['sectionA'] = {}
    default_conf['sectionB'] = {}
    # Assign deprecated setting
    default_conf['sectionB']['deprecated_setting'] = 'valB'

    # Both new and deprecated settings exists
    process_deprecated_setting(default_conf,
                               'sectionB', 'deprecated_setting',
                               'sectionA', 'new_setting')
    assert log_has_re('DEPRECATED', caplog)
    # The value of the new setting shall have been set to the
    # value of the deprecated one
    assert default_conf['sectionA']['new_setting'] == 'valB'
    # Old setting is removed
    assert 'deprecated_setting' not in default_conf['sectionB']

    caplog.clear()

    # Delete new setting (deprecated exists)
    del default_conf['sectionA']['new_setting']
    default_conf['sectionB']['deprecated_setting'] = 'valB'
    process_deprecated_setting(default_conf,
                               'sectionB', 'deprecated_setting',
                               'sectionA', 'new_setting')
    assert log_has_re('DEPRECATED', caplog)
    # The value of the new setting shall have been set to the
    # value of the deprecated one
    assert default_conf['sectionA']['new_setting'] == 'valB'

    caplog.clear()

    # Assign new setting
    default_conf['sectionA']['new_setting'] = 'valA'
    # Delete deprecated setting
    default_conf['sectionB'].pop('deprecated_setting', None)
    process_deprecated_setting(default_conf,
                               'sectionB', 'deprecated_setting',
                               'sectionA', 'new_setting')
    assert not log_has_re('DEPRECATED', caplog)
    assert default_conf['sectionA']['new_setting'] == 'valA'

    caplog.clear()
    # Test moving to root
    default_conf['sectionB']['deprecated_setting2'] = "DeadBeef"
    process_deprecated_setting(default_conf,
                               'sectionB', 'deprecated_setting2',
                               None, 'new_setting')

    assert log_has_re('DEPRECATED', caplog)
    assert default_conf['new_setting']


def test_process_removed_setting(mocker, default_conf, caplog):
    patched_configuration_load_config_file(mocker, default_conf)

    # Create sections for new and deprecated settings
    # (they may not exist in the config)
    default_conf['sectionA'] = {}
    default_conf['sectionB'] = {}
    # Assign new setting
    default_conf['sectionB']['somesetting'] = 'valA'

    # Only new setting exists (nothing should happen)
    process_removed_setting(default_conf,
                            'sectionA', 'somesetting',
                            'sectionB', 'somesetting')
    # Assign removed setting
    default_conf['sectionA']['somesetting'] = 'valB'

    with pytest.raises(OperationalException,
                       match=r"Setting .* has been moved"):
        process_removed_setting(default_conf,
                                'sectionA', 'somesetting',
                                'sectionB', 'somesetting')


def test_process_deprecated_ticker_interval(default_conf, caplog):
    message = "DEPRECATED: Please use 'timeframe' instead of 'ticker_interval."
    config = deepcopy(default_conf)

    process_temporary_deprecated_settings(config)
    assert not log_has(message, caplog)

    del config['timeframe']
    config['ticker_interval'] = '15m'
    with pytest.raises(OperationalException,
                       match=r"DEPRECATED: 'ticker_interval' detected. Please use.*"):
        process_temporary_deprecated_settings(config)


def test_process_deprecated_protections(default_conf, caplog):
    message = "DEPRECATED: Setting 'protections' in the configuration is deprecated."
    config = deepcopy(default_conf)
    process_temporary_deprecated_settings(config)
    assert not log_has(message, caplog)

    config['protections'] = []
    process_temporary_deprecated_settings(config)
    assert log_has(message, caplog)


def test_flat_vars_to_nested_dict(caplog):

    test_args = {
        'FREQTRADE__EXCHANGE__SOME_SETTING': 'true',
        'FREQTRADE__EXCHANGE__SOME_FALSE_SETTING': 'false',
        'FREQTRADE__EXCHANGE__CONFIG__whatever': 'sometime',
        'FREQTRADE__ASK_STRATEGY__PRICE_SIDE': 'bid',
        'FREQTRADE__ASK_STRATEGY__cccc': '500',
        'FREQTRADE__STAKE_AMOUNT': '200.05',
        'FREQTRADE__TELEGRAM__CHAT_ID': '2151',
        'NOT_RELEVANT': '200.0',  # Will be ignored
    }
    expected = {
        'stake_amount': 200.05,
        'ask_strategy': {
            'price_side': 'bid',
            'cccc': 500,
        },
        'exchange': {
            'config': {
                'whatever': 'sometime',
            },
            'some_setting': True,
            'some_false_setting': False,
        },
        'telegram': {
            'chat_id': '2151'
        }
    }
    res = flat_vars_to_nested_dict(test_args, ENV_VAR_PREFIX)
    assert res == expected

    assert log_has("Loading variable 'FREQTRADE__EXCHANGE__SOME_SETTING'", caplog)
    assert not log_has("Loading variable 'NOT_RELEVANT'", caplog)