catalyst/zipline/testing/fixtures.py

from abc import ABCMeta, abstractproperty
import gc
import sqlite3
from unittest import TestCase

from contextlib2 import ExitStack
from logbook import NullHandler, Logger
from nose_parameterized import parameterized
import numpy as np
import pandas as pd
from pandas.util.testing import assert_series_equal
import responses
from six import with_metaclass, iteritems
from toolz import flip

from ..assets.synthetic import make_simple_equity_info
from .core import (
    create_daily_bar_data,
    create_minute_bar_data,
    gen_calendars,
    tmp_asset_finder,
    tmp_dir,
)
from ..data.data_portal import DataPortal
from ..data.us_equity_pricing import (
    SQLiteAdjustmentReader,
    SQLiteAdjustmentWriter,
)
from ..finance.trading import TradingEnvironment
from ..data.us_equity_pricing import (
    BcolzDailyBarReader,
    BcolzDailyBarWriter,
)
from ..data.minute_bars import (
    BcolzMinuteBarReader,
    BcolzMinuteBarWriter,
    US_EQUITIES_MINUTES_PER_DAY
)
from ..utils import tradingcalendar, factory
from ..utils.classproperty import classproperty
from ..utils.final import FinalMeta, final
from ..utils.metautils import compose_types
from ..pipeline import Pipeline, SimplePipelineEngine
from ..utils.numpy_utils import make_datetime64D
from ..utils.numpy_utils import NaTD


def _take_out_the_trash():
    """Force the gc to clear all innaccessible objects.

    This will only kill stranded reference cycles, objects that don't
    participate in a cycle are destroyed when there are no more references.

    Notes
    -----
    This function is used to ensure that objects that are holding open file
    handles are destroyed, closing the files. On windows files cannot be
    deleted if they are opened.
    """
    while gc.collect():
        pass


class ZiplineTestCase(with_metaclass(FinalMeta, TestCase)):
    """
    Shared extensions to core unittest.TestCase.

    Overrides the default unittest setUp/tearDown functions with versions that
    use ExitStack to correctly clean up resources, even in the face of
    exceptions that occur during setUp/setUpClass.

    Subclasses **should not override setUp or setUpClass**!

    Instead, they should implement `init_instance_fixtures` for per-test-method
    resources, and `init_class_fixtures` for per-class resources.

    Resources that need to be cleaned up should be registered using
    either `enter_{class,instance}_context` or `add_{class,instance}_callback}.
    """
    _in_setup = False

    @final
    @classmethod
    def setUpClass(cls):
        # Hold a set of all the "static" attributes on the class. These are
        # things that are not populated after the class was created like
        # methods or other class level attributes.
        cls._static_class_attributes = set(vars(cls))
        cls._class_teardown_stack = ExitStack()
        try:
            cls._base_init_fixtures_was_called = False
            cls.init_class_fixtures()
            assert cls._base_init_fixtures_was_called, (
                "ZiplineTestCase.init_class_fixtures() was not called.\n"
                "This probably means that you overrode init_class_fixtures"
                " without calling super()."
            )
        except:
            cls.tearDownClass()
            raise

    @classmethod
    def init_class_fixtures(cls):
        """
        Override and implement this classmethod to register resources that
        should be created and/or torn down on a per-class basis.

        Subclass implementations of this should always invoke this with super()
        to ensure that fixture mixins work properly.
        """
        if cls._in_setup:
            raise ValueError(
                'Called init_class_fixtures from init_instance_fixtures.'
                'Did you write super(..., self).init_class_fixtures() instead'
                ' of super(..., self).init_instance_fixtures()?',
            )
        cls._base_init_fixtures_was_called = True

    @final
    @classmethod
    def tearDownClass(cls):
        _take_out_the_trash()
        cls._class_teardown_stack.close()
        for name in set(vars(cls)) - cls._static_class_attributes:
            # Remove all of the attributes that were added after the class was
            # constructed. This cleans up any large test data that is class
            # scoped while still allowing subclasses to access class level
            # attributes.
            delattr(cls, name)

    @final
    @classmethod
    def enter_class_context(cls, context_manager):
        """
        Enter a context manager to be exited during the tearDownClass
        """
        if cls._in_setup:
            raise ValueError(
                'Attempted to enter a class context in init_instance_fixtures.'
                '\nDid you mean to call enter_instance_context?',
            )
        return cls._class_teardown_stack.enter_context(context_manager)

    @final
    @classmethod
    def add_class_callback(cls, callback):
        """
        Register a callback to be executed during tearDownClass.

        Parameters
        ----------
        callback : callable
            The callback to invoke at the end of the test suite.
        """
        if cls._in_setup:
            raise ValueError(
                'Attempted to add a class callback in init_instance_fixtures.'
                '\nDid you mean to call add_instance_callback?',
            )
        return cls._class_teardown_stack.callback(callback)

    @final
    def setUp(self):
        type(self)._in_setup = True
        self._pre_setup_attrs = set(vars(self))
        self._instance_teardown_stack = ExitStack()
        try:
            self._init_instance_fixtures_was_called = False
            self.init_instance_fixtures()
            assert self._init_instance_fixtures_was_called, (
                "ZiplineTestCase.init_instance_fixtures() was not"
                " called.\n"
                "This probably means that you overrode"
                " init_instance_fixtures without calling super()."
            )
        except:
            self.tearDown()
            raise
        finally:
            type(self)._in_setup = False

    def init_instance_fixtures(self):
        self._init_instance_fixtures_was_called = True

    @final
    def tearDown(self):
        _take_out_the_trash()
        self._instance_teardown_stack.close()
        for attr in set(vars(self)) - self._pre_setup_attrs:
            delattr(self, attr)

    @final
    def enter_instance_context(self, context_manager):
        """
        Enter a context manager that should be exited during tearDown.
        """
        return self._instance_teardown_stack.enter_context(context_manager)

    @final
    def add_instance_callback(self, callback):
        """
        Register a callback to be executed during tearDown.

        Parameters
        ----------
        callback : callable
            The callback to invoke at the end of each test.
        """
        return self._instance_teardown_stack.callback(callback)


def alias(attr_name):
    """Make a fixture attribute an alias of another fixture's attribute by
    default.

    Parameters
    ----------
    attr_name : str
        The name of the attribute to alias.

    Returns
    -------
    p : classproperty
        A class property that does the property aliasing.

    Examples
    --------
    >>> class C(object):
    ...     attr = 1
    ...
    >>> class D(object):
    ...     attr_alias = alias('attr')
    ...
    >>> D.attr
    1
    >>> D.attr_alias
    1
    >>> class E(D):
    ...     attr_alias = 2
    ...
    >>> E.attr
    1
    >>> E.attr_alias
    2
    """
    return classproperty(flip(getattr, attr_name))


class WithDefaultDateBounds(object):
    """
    ZiplineTestCase mixin which makes it possible to synchronize date bounds
    across fixtures.

    Attributes
    ----------
    START_DATE : datetime
    END_DATE : datetime
        The date bounds to be used for fixtures that want to have consistent
        dates.
    """
    START_DATE = pd.Timestamp('2006-01-03', tz='utc')
    END_DATE = pd.Timestamp('2006-12-29', tz='utc')


class WithLogger(object):
    """
    ZiplineTestCase mixin providing cls.log_handler as an instance-level
    fixture.

    After init_instance_fixtures has been called `self.log_handler` will be a
    new ``logbook.NullHandler``.

    Methods
    -------
    make_log_handler() -> logbook.LogHandler
        A class method which constructs the new log handler object. By default
        this will construct a ``NullHandler``.
    """
    make_log_handler = NullHandler

    @classmethod
    def init_class_fixtures(cls):
        super(WithLogger, cls).init_class_fixtures()
        cls.log = Logger()
        cls.log_handler = cls.enter_class_context(
            cls.make_log_handler().applicationbound(),
        )


class WithAssetFinder(WithDefaultDateBounds):
    """
    ZiplineTestCase mixin providing cls.asset_finder as a class-level fixture.

    After init_class_fixtures has been called, `cls.asset_finder` is populated
    with an AssetFinder.

    Attributes
    ----------
    ASSET_FINDER_EQUITY_SIDS : iterable[int]
        The default sids to construct equity data for.
    ASSET_FINDER_EQUITY_SYMBOLS : iterable[str]
        The default symbols to use for the equities.
    ASSET_FINDER_EQUITY_START_DATE : datetime
        The default start date to create equity data for. This defaults to
        ``START_DATE``.
    ASSET_FINDER_EQUITY_END_DATE : datetime
        The default end date to create equity data for. This defaults to
        ``END_DATE``.

    Methods
    -------
    make_equity_info() -> pd.DataFrame
        A class method which constructs the dataframe of equity info to write
        to the class's asset db. By default this is empty.
    make_futures_info() -> pd.DataFrame
        A class method which constructs the dataframe of futures contract info
        to write to the class's asset db. By default this is empty.
    make_exchanges_info() -> pd.DataFrame
        A class method which constructs the dataframe of exchange information
        to write to the class's assets db. By default this is empty.
    make_root_symbols_info() -> pd.DataFrame
        A class method which constructs the dataframe of root symbols
        information to write to the class's assets db. By default this is
        empty.
    make_asset_finder() -> pd.DataFrame
        A class method which constructs the actual asset finder object to use
        for the class. If this method is overridden then the ``make_*_info``
        methods may not be respected.

    See Also
    --------
    zipline.testing.make_simple_equity_info
    zipline.testing.make_jagged_equity_info
    zipline.testing.make_rotating_equity_info
    zipline.testing.make_future_info
    zipline.testing.make_commodity_future_info
    """
    ASSET_FINDER_EQUITY_SIDS = ord('A'), ord('B'), ord('C')
    ASSET_FINDER_EQUITY_SYMBOLS = None
    ASSET_FINDER_EQUITY_START_DATE = alias('START_DATE')
    ASSET_FINDER_EQUITY_END_DATE = alias('END_DATE')

    @classmethod
    def _make_info(cls):
        return None

    make_futures_info = _make_info
    make_exchanges_info = _make_info
    make_root_symbols_info = _make_info

    del _make_info

    @classmethod
    def make_equity_info(cls):
        return make_simple_equity_info(
            cls.ASSET_FINDER_EQUITY_SIDS,
            cls.ASSET_FINDER_EQUITY_START_DATE,
            cls.ASSET_FINDER_EQUITY_END_DATE,
            cls.ASSET_FINDER_EQUITY_SYMBOLS,
        )

    @classmethod
    def make_asset_finder(cls):
        return cls.enter_class_context(tmp_asset_finder(
            equities=cls.make_equity_info(),
            futures=cls.make_futures_info(),
            exchanges=cls.make_exchanges_info(),
            root_symbols=cls.make_root_symbols_info(),
        ))

    @classmethod
    def init_class_fixtures(cls):
        super(WithAssetFinder, cls).init_class_fixtures()
        cls.asset_finder = cls.make_asset_finder()


class WithTradingEnvironment(WithAssetFinder):
    """
    ZiplineTestCase mixin providing cls.env as a class-level fixture.

    After ``init_class_fixtures`` has been called, `cls.env` is populated
    with a trading environment whose `asset_finder` is the result of
    `cls.make_asset_finder`.

    Attributes
    ----------
    TRADING_ENV_MIN_DATE : datetime
        The min_date to forward to the constructed TradingEnvironment.
    TRADING_ENV_MAX_DATE : datetime
        The max date to forward to the constructed TradingEnvironment.
    TRADING_ENV_TRADING_CALENDAR : pd.DatetimeIndex
        The trading calendar to use for the class's TradingEnvironment.

    Methods
    -------
    make_load_function() -> callable
        A class method that returns the ``load`` argument to pass to the
        constructor of ``TradingEnvironment`` for this class.
        The signature for the callable returned is:
        ``(datetime, pd.DatetimeIndex, str) -> (pd.Series, pd.DataFrame)``
    make_trading_environment() -> TradingEnvironment
        A class method that constructs the trading environment for the class.
        If this is overridden then ``make_load_function`` or the class
        attributes may not be respected.

    See Also
    --------
    :class:`zipline.finance.trading.TradingEnvironment`
    """
    TRADING_ENV_MIN_DATE = None
    TRADING_ENV_MAX_DATE = None
    TRADING_ENV_TRADING_CALENDAR = tradingcalendar

    @classmethod
    def make_load_function(cls):
        return None

    @classmethod
    def make_trading_environment(cls):
        return TradingEnvironment(
            load=cls.make_load_function(),
            asset_db_path=cls.asset_finder.engine,
            min_date=cls.TRADING_ENV_MIN_DATE,
            max_date=cls.TRADING_ENV_MAX_DATE,
            env_trading_calendar=cls.TRADING_ENV_TRADING_CALENDAR,
        )

    @classmethod
    def init_class_fixtures(cls):
        super(WithTradingEnvironment, cls).init_class_fixtures()
        cls.env = cls.make_trading_environment()


class WithSimParams(WithTradingEnvironment):
    """
    ZiplineTestCase mixin providing cls.sim_params as a class level fixture.

    The arguments used to construct the trading environment may be overridded
    by putting ``SIM_PARAMS_{argname}`` in the class dict except for the
    trading environment which is overridden with the mechanisms provided by
    ``WithTradingEnvironment``.

    Attributes
    ----------
    SIM_PARAMS_YEAR : int
    SIM_PARAMS_CAPITAL_BASE : float
    SIM_PARAMS_NUM_DAYS : int
    SIM_PARAMS_DATA_FREQUENCY : {'daily', 'minute'}
    SIM_PARAMS_EMISSION_RATE : {'daily', 'minute'}
        Forwarded to ``factory.create_simulation_parameters``.

    SIM_PARAMS_START : datetime
    SIM_PARAMS_END : datetime
        Forwarded to ``factory.create_simulation_parameters``. If not
        explicitly overridden these will be ``START_DATE`` and ``END_DATE``

    See Also
    --------
    zipline.utils.factory.create_simulation_parameters
    """
    SIM_PARAMS_YEAR = None
    SIM_PARAMS_CAPITAL_BASE = 1.0e5
    SIM_PARAMS_NUM_DAYS = None
    SIM_PARAMS_DATA_FREQUENCY = 'daily'
    SIM_PARAMS_EMISSION_RATE = 'daily'

    SIM_PARAMS_START = alias('START_DATE')
    SIM_PARAMS_END = alias('END_DATE')

    @classmethod
    def make_simparams(cls):
        return factory.create_simulation_parameters(
            year=cls.SIM_PARAMS_YEAR,
            start=cls.SIM_PARAMS_START,
            end=cls.SIM_PARAMS_END,
            num_days=cls.SIM_PARAMS_NUM_DAYS,
            capital_base=cls.SIM_PARAMS_CAPITAL_BASE,
            data_frequency=cls.SIM_PARAMS_DATA_FREQUENCY,
            emission_rate=cls.SIM_PARAMS_EMISSION_RATE,
            env=cls.env,
        )

    @classmethod
    def init_class_fixtures(cls):
        super(WithSimParams, cls).init_class_fixtures()
        cls.sim_params = cls.make_simparams()


class WithNYSETradingDays(object):
    """
    ZiplineTestCase mixin providing cls.trading_days as a class-level fixture.

    After init_class_fixtures has been called, `cls.trading_days` is populated
    with a DatetimeIndex containing NYSE calendar trading days ranging from:

    (DATA_MAX_DAY - (cls.TRADING_DAY_COUNT) -> DATA_MAX_DAY)

    Attributes
    ----------
    DATA_MAX_DAY : datetime
        The most recent trading day in the calendar.
    TRADING_DAY_COUNT : int
        The number of days to put in the calendar. The default value of
        ``TRADING_DAY_COUNT`` is 126 (half a trading-year). Inheritors can
        override TRADING_DAY_COUNT to request more or less data.
    """
    DATA_MIN_DAY = alias('START_DATE')
    DATA_MAX_DAY = alias('END_DATE')

    @classmethod
    def init_class_fixtures(cls):
        super(WithNYSETradingDays, cls).init_class_fixtures()

        all_days = tradingcalendar.trading_days
        start_loc = all_days.get_loc(cls.DATA_MIN_DAY, 'bfill')
        end_loc = all_days.get_loc(cls.DATA_MAX_DAY, 'ffill')

        cls.trading_days = all_days[start_loc:end_loc + 1]


class WithTmpDir(object):
    """
    ZiplineTestCase mixing providing cls.tmpdir as a class-level fixture.

    After init_class_fixtures has been called, `cls.tmpdir` is populated with
    a `testfixtures.TempDirectory` object whose path is `cls.TMP_DIR_PATH`.

    Attributes
    ----------
    TMP_DIR_PATH : str
        The path to the new directory to create. By default this is None
        which will create a unique directory in /tmp.
    """
    TMP_DIR_PATH = None

    @classmethod
    def init_class_fixtures(cls):
        super(WithTmpDir, cls).init_class_fixtures()
        cls.tmpdir = cls.enter_class_context(
            tmp_dir(path=cls.TMP_DIR_PATH),
        )


class WithInstanceTmpDir(object):
    """
    ZiplineTestCase mixing providing self.tmpdir as an instance-level fixture.

    After init_instance_fixtures has been called, `self.tmpdir` is populated
    with a `testfixtures.TempDirectory` object whose path is
    `cls.TMP_DIR_PATH`.

    Attributes
    ----------
    INSTANCE_TMP_DIR_PATH : str
        The path to the new directory to create. By default this is None
        which will create a unique directory in /tmp.
    """
    INSTANCE_TMP_DIR_PATH = None

    def init_instance_fixtures(self):
        super(WithInstanceTmpDir, self).init_instance_fixtures()
        self.instance_tmpdir = self.enter_instance_context(
            tmp_dir(path=self.INSTANCE_TMP_DIR_PATH),
        )


class WithBcolzDailyBarReader(WithTradingEnvironment, WithTmpDir):
    """
    ZiplineTestCase mixin providing cls.bcolz_daily_bar_path,
    cls.bcolz_daily_bar_ctable, and cls.bcolz_daily_bar_reader class level
    fixtures.

    After init_class_fixtures has been called:
    - `cls.bcolz_daily_bar_path` is populated with
      `cls.tmpdir.getpath(cls.BCOLZ_DAILY_BAR_PATH)`.
    - `cls.bcolz_daily_bar_ctable` is populated with data returned from
      `cls.make_daily_bar_data`. By default this calls
      :func:`zipline.pipeline.loaders.synthetic.make_daily_bar_data`.
    - `cls.bcolz_daily_bar_reader` is a daily bar reader pointing to the
      directory that was just written to.

    Attributes
    ----------
    BCOLZ_DAILY_BAR_PATH : str
        The path inside the tmpdir where this will be written.
    BCOLZ_DAILY_BAR_LOOKBACK_DAYS : int
        The number of days of data to add before the first day. This is used
        when a test needs to use history, in which case this should be set to
        the largest history window that will be
        requested.
    BCOLZ_DAILY_BAR_USE_FULL_CALENDAR : bool
        If this flag is set the ``bcolz_daily_bar_days`` will be the full
        set of trading days from the trading environment. This flag overrides
        ``BCOLZ_DAILY_BAR_LOOKBACK_DAYS``.

    Methods
    -------
    make_daily_bar_data() -> iterable[(int, pd.DataFrame)]
        A class method that returns an iterator of (sid, dataframe) pairs
        which will be written to the bcolz files that the class's
        ``BcolzDailyBarReader`` will read from. By default this creates
        some simple sythetic data with
        :func:`~zipline.testing.create_daily_bar_data`

    See Also
    --------
    WithBcolzMinuteBarReader
    WithDataPortal
    zipline.testing.create_daily_bar_data
    """
    BCOLZ_DAILY_BAR_PATH = 'daily_equity_pricing.bcolz'
    BCOLZ_DAILY_BAR_LOOKBACK_DAYS = 0
    BCOLZ_DAILY_BAR_USE_FULL_CALENDAR = False
    BCOLZ_DAILY_BAR_START_DATE = alias('START_DATE')
    BCOLZ_DAILY_BAR_END_DATE = alias('END_DATE')
    # allows WithBcolzDailyBarReaderFromCSVs to call the `write_csvs` method
    # without needing to reimplement `init_class_fixtures`
    _write_method_name = 'write'

    @classmethod
    def make_daily_bar_data(cls):
        return create_daily_bar_data(
            cls.bcolz_daily_bar_days,
            cls.asset_finder.sids,
        )

    @classmethod
    def init_class_fixtures(cls):
        super(WithBcolzDailyBarReader, cls).init_class_fixtures()
        cls.bcolz_daily_bar_path = p = cls.tmpdir.makedir(
            cls.BCOLZ_DAILY_BAR_PATH,
        )
        if cls.BCOLZ_DAILY_BAR_USE_FULL_CALENDAR:
            days = cls.env.trading_days
        else:
            days = cls.env.days_in_range(
                cls.env.trading_days[
                    cls.env.get_index(cls.BCOLZ_DAILY_BAR_START_DATE) -
                    cls.BCOLZ_DAILY_BAR_LOOKBACK_DAYS
                ],
                cls.BCOLZ_DAILY_BAR_END_DATE,
            )
        cls.bcolz_daily_bar_days = days
        cls.bcolz_daily_bar_ctable = t = getattr(
            BcolzDailyBarWriter(p, days),
            cls._write_method_name,
        )(cls.make_daily_bar_data())

        cls.bcolz_daily_bar_reader = BcolzDailyBarReader(t)


class WithBcolzDailyBarReaderFromCSVs(WithBcolzDailyBarReader):
    """
    ZiplineTestCase mixin that provides cls.bcolz_daily_bar_reader from a
    mapping of sids to CSV file paths.
    """
    _write_method_name = 'write_csvs'


class WithBcolzMinuteBarReader(WithTradingEnvironment, WithTmpDir):
    """
    ZiplineTestCase mixin providing cls.bcolz_minute_bar_path,
    cls.bcolz_minute_bar_ctable, and cls.bcolz_minute_bar_reader class level
    fixtures.

    After init_class_fixtures has been called:
    - `cls.bcolz_minute_bar_path` is populated with
      `cls.tmpdir.getpath(cls.BCOLZ_MINUTE_BAR_PATH)`.
    - `cls.bcolz_minute_bar_ctable` is populated with data returned from
      `cls.make_minute_bar_data`. By default this calls
      :func:`zipline.pipeline.loaders.synthetic.make_minute_bar_data`.
    - `cls.bcolz_minute_bar_reader` is a minute bar reader pointing to the
      directory that was just written to.

    Attributes
    ----------
    BCOLZ_MINUTE_BAR_PATH : str
        The path inside the tmpdir where this will be written.
    BCOLZ_MINUTE_BAR_LOOKBACK_DAYS : int
        The number of days of data to add before the first day.
        This is used when a test needs to use history, in which case this
        should be set to the largest history window that will be requested.
    BCOLZ_MINUTE_BAR_USE_FULL_CALENDAR : bool
        If this flag is set the ``bcolz_daily_bar_days`` will be the full
        set of trading days from the trading environment. This flag overrides
        ``BCOLZ_MINUTE_BAR_LOOKBACK_DAYS``.

    Methods
    -------
    make_minute_bar_data() -> dict[int -> pd.DataFrame]
        A class method that returns a dict mapping sid to dataframe
        which will be written to the bcolz files that the class's
        ``BcolzMinuteBarReader`` will read from. By default this creates
        some simple sythetic data with
        :func:`~zipline.testing.create_minute_bar_data`

    See Also
    --------
    WithBcolzDailyBarReader
    WithDataPortal
    zipline.testing.create_minute_bar_data
    """
    BCOLZ_MINUTE_BAR_PATH = 'minute_equity_pricing.bcolz'
    BCOLZ_MINUTE_BAR_LOOKBACK_DAYS = 0
    BCOLZ_MINUTE_BAR_USE_FULL_CALENDAR = False
    BCOLZ_MINUTE_BAR_START_DATE = alias('START_DATE')
    BCOLZ_MINUTE_BAR_END_DATE = alias('END_DATE')

    @classmethod
    def make_minute_bar_data(cls):
        return create_minute_bar_data(
            cls.env.minutes_for_days_in_range(
                cls.bcolz_minute_bar_days[0],
                cls.bcolz_minute_bar_days[-1],
            ),
            cls.asset_finder.sids,
        )

    @classmethod
    def init_class_fixtures(cls):
        super(WithBcolzMinuteBarReader, cls).init_class_fixtures()
        cls.bcolz_minute_bar_path = p = cls.tmpdir.makedir(
            cls.BCOLZ_MINUTE_BAR_PATH,
        )
        if cls.BCOLZ_MINUTE_BAR_USE_FULL_CALENDAR:
            days = cls.env.trading_days
        else:
            days = cls.env.days_in_range(
                cls.env.trading_days[
                    cls.env.get_index(cls.BCOLZ_MINUTE_BAR_START_DATE) -
                    cls.BCOLZ_MINUTE_BAR_LOOKBACK_DAYS
                ],
                cls.BCOLZ_MINUTE_BAR_END_DATE,
            )
        cls.bcolz_minute_bar_days = days
        writer = BcolzMinuteBarWriter(
            days[0],
            p,
            cls.env.open_and_closes.market_open.loc[days],
            cls.env.open_and_closes.market_close.loc[days],
            US_EQUITIES_MINUTES_PER_DAY
        )
        cls.bcolz_minute_bar_data = cls.make_minute_bar_data()
        for sid, df in iteritems(cls.bcolz_minute_bar_data):
            writer.write(sid, df)

        cls.bcolz_minute_bar_reader = BcolzMinuteBarReader(p)


class WithAdjustmentReader(WithBcolzDailyBarReader):
    """
    ZiplineTestCase mixin providing cls.adjustment_reader as a class level
    fixture.

    After init_class_fixtures has been called, `cls.adjustment_reader` will be
    populated with a new SQLiteAdjustmentReader object. The data that will be
    written can be passed by overriding `make_{field}_data` where field may
    be `splits`, `mergers` `dividends`, or `stock_dividends`.
    The daily bar reader used for this adjustment reader may be customized
    by overriding `make_adjustment_writer_daily_bar_reader`. This is useful
    to providing a `MockDailyBarReader`.

    Methods
    -------
    make_splits_data() -> pd.DataFrame
        A class method that returns a dataframe of splits data to write to the
        class's adjustment db. By default this is empty.
    make_mergers_data() -> pd.DataFrame
        A class method that returns a dataframe of mergers data to write to the
        class's adjustment db. By default this is empty.
    make_dividends_data() -> pd.DataFrame
        A class method that returns a dataframe of dividends data to write to
        the class's adjustment db. By default this is empty.
    make_stock_dividends_data() -> pd.DataFrame
        A class method that returns a dataframe of stock dividends data to
        write to the class's adjustment db. By default this is empty.
    make_adjustment_writer_daily_bar_reader() -> pd.DataFrame
        A class method that returns the daily bar reader to use for the class's
        adjustment writer. By default this is the class's actual
        ``bcolz_daily_bar_reader`` as inherited from
        ``WithBcolzDailyBarReader``. This should probably not be overridden;
        however, some tests used a ``MockDailyBarReader`` for this.
    make_adjustment_writer(conn: sqlite3.Connection) -> AdjustmentWriter
        A class method that constructs the adjustment which will be used
        to write the data into the connection to be used by the class's
        adjustment reader.

    See Also
    --------
    zipline.testing.MockDailyBarReader
    """
    @classmethod
    def _make_data(cls):
        return None

    make_splits_data = _make_data
    make_mergers_data = _make_data
    make_dividends_data = _make_data
    make_stock_dividends_data = _make_data

    del _make_data

    @classmethod
    def make_adjustment_writer(cls, conn):
        return SQLiteAdjustmentWriter(
            conn,
            cls.make_adjustment_writer_daily_bar_reader(),
            cls.bcolz_daily_bar_days,
        )

    @classmethod
    def make_adjustment_writer_daily_bar_reader(cls):
        return cls.bcolz_daily_bar_reader

    @classmethod
    def init_class_fixtures(cls):
        super(WithAdjustmentReader, cls).init_class_fixtures()
        conn = sqlite3.connect(':memory:')
        cls.make_adjustment_writer(conn).write(
            splits=cls.make_splits_data(),
            mergers=cls.make_mergers_data(),
            dividends=cls.make_dividends_data(),
            stock_dividends=cls.make_stock_dividends_data(),
        )
        cls.adjustment_reader = SQLiteAdjustmentReader(conn)


class WithPipelineEventDataLoader(with_metaclass(
        compose_types(ABCMeta, type(ZiplineTestCase)), WithAssetFinder)):
    """
    ZiplineTestCase mixin providing common test methods/behaviors for event
    data loaders.

    Attributes
    ----------
    loader_type : PipelineLoader
        The type of loader to use. This must be overridden by subclasses.

    Methods
    -------
    get_sids() -> iterable[int]
        Class method which returns the sids that need to be available to the
        tests.
    get_dataset() -> dict[int -> pd.DataFrmae]
        Class method which returns a mapping from sid to data for that sid.
        By default this is empty for every sid.
    pipeline_event_loader_args(dates: pd.DatetimeIndex) -> tuple[any]
        The arguments to pass to the ``loader_type`` to construct the pipeline
        loader for this test.
    """
    @classmethod
    def get_sids(cls):
        return range(0, 5)

    @classmethod
    def get_dataset(cls):
        return {sid: pd.DataFrame() for sid in cls.get_sids()}

    @abstractproperty
    def loader_type(self):
        raise NotImplementedError('loader_type')

    @classmethod
    def make_equity_info(cls):
        return make_simple_equity_info(
            cls.get_sids(),
            start_date=pd.Timestamp('2013-01-01', tz='UTC'),
            end_date=pd.Timestamp('2015-01-01', tz='UTC'),
        )

    def pipeline_event_loader_args(self, dates):
        """Construct the base  object to pass to the loader.

        Parameters
        ----------
        dates : pd.DatetimeIndex
            The dates we can serve.

        Returns
        -------
        args : tuple[any]
            The arguments to forward to the loader positionally.
        """
        return dates, self.get_dataset()

    def pipeline_event_setup_engine(self, dates):
        """
        Make a Pipeline Enigne object based on the given dates.
        """
        loader = self.loader_type(*self.pipeline_event_loader_args(dates))
        return SimplePipelineEngine(lambda _: loader, dates, self.asset_finder)

    @staticmethod
    def _compute_busday_offsets(announcement_dates):
        """
        Compute expected business day offsets from a DataFrame of announcement
        dates.
        """
        # Column-vector of dates on which factor `compute` will be called.
        raw_call_dates = announcement_dates.index.values.astype(
            'datetime64[D]'
        )[:, None]

        # 2D array of dates containining expected nexg announcement.
        raw_announce_dates = (
            announcement_dates.values.astype('datetime64[D]')
        )

        # Set NaTs to 0 temporarily because busday_count doesn't support NaT.
        # We fill these entries with NaNs later.
        whereNaT = raw_announce_dates == NaTD
        raw_announce_dates[whereNaT] = make_datetime64D(0)

        # The abs call here makes it so that we can use this function to
        # compute offsets for both next and previous earnings (previous
        # earnings offsets come back negative).
        expected = abs(np.busday_count(
            raw_call_dates,
            raw_announce_dates
        ).astype(float))

        expected[whereNaT] = np.nan
        return pd.DataFrame(
            data=expected,
            columns=announcement_dates.columns,
            index=announcement_dates.index,
        )

    @parameterized.expand(gen_calendars(
        '2014-01-01',
        '2014-01-31',
        critical_dates=pd.to_datetime([
            '2014-01-05',
            '2014-01-10',
            '2014-01-15',
            '2014-01-20',
        ], utc=True),
    ))
    def test_compute(self, dates):
        engine = self.pipeline_event_setup_engine(dates)
        cols = self.setup(dates)

        pipe = Pipeline(
            columns=self.pipeline_columns
        )

        result = engine.run_pipeline(
            pipe,
            start_date=dates[0],
            end_date=dates[-1],
        )

        for sid in self.get_sids():
            for col_name in cols.keys():
                assert_series_equal(result[col_name].xs(sid, level=1),
                                    cols[col_name][sid],
                                    check_names=False)


class WithDataPortal(WithBcolzMinuteBarReader, WithAdjustmentReader):
    """
    ZiplineTestCase mixin providing self.data_portal as an instance level
    fixture.

    After init_instance_fixtures has been called, `self.data_portal` will be
    populated with a new data portal created by passing in the class's
    trading env, `cls.bcolz_minute_bar_reader`, `cls.bcolz_daily_bar_reader`,
    and `cls.adjustment_reader`.

    Attributes
    ----------
    DATA_PORTAL_USE_DAILY_DATA : bool
        Should the daily bar reader be used? Defaults to True.
    DATA_PORTAL_USE_MINUTE_DATA : bool
        Should the minute bar reader be used? Defaults to True.
    DATA_PORTAL_USE_ADJUSTMENTS : bool
        Should the adjustment reader be used? Defaults to True.

    Methods
    -------
    make_data_portal() -> DataPortal
        Method which returns the data portal to be used for each test case.
        If this is overridden, the ``DATA_PORTAL_USE_*`` attributes may not
        be respected.
    """
    DATA_PORTAL_USE_DAILY_DATA = True
    DATA_PORTAL_USE_MINUTE_DATA = True
    DATA_PORTAL_USE_ADJUSTMENTS = True

    def make_data_portal(self):
        return DataPortal(
            self.env,
            equity_daily_reader=(
                self.bcolz_daily_bar_reader
                if self.DATA_PORTAL_USE_DAILY_DATA else
                None
            ),
            equity_minute_reader=(
                self.bcolz_minute_bar_reader
                if self.DATA_PORTAL_USE_MINUTE_DATA else
                None
            ),
            adjustment_reader=(
                self.adjustment_reader
                if self.DATA_PORTAL_USE_ADJUSTMENTS else
                None
            ),
        )

    def init_instance_fixtures(self):
        super(WithDataPortal, self).init_instance_fixtures()
        self.data_portal = self.make_data_portal()


class WithResponses(object):
    """
    ZiplineTestCase mixin that provides self.responses as an instance
    fixture.

    After init_instance_fixtures has been called, `self.responses` will be
    a new `responses.RequestsMock` object. Users may add new endpoints to this
    with the `self.responses.add` method.
    """
    def init_instance_fixtures(self):
        super(WithResponses, self).init_instance_fixtures()
        self.responses = self.enter_instance_context(
            responses.RequestsMock(),
        )