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Fuzzy attributes
================
.. module:: factory.fuzzy
Some tests may be interested in testing with fuzzy, random values.
This is handled by the :mod:`factory.fuzzy` module, which provides a few
random declarations.
FuzzyAttribute
--------------
.. class:: FuzzyAttribute
The :class:`FuzzyAttribute` uses an arbitrary callable as fuzzer.
It is expected that successive calls of that function return various
values.
.. attribute:: fuzzer
The callable that generates random values
FuzzyText
---------
.. class:: FuzzyText(length=12, chars=string.ascii_letters, prefix='')
The :class:`FuzzyText` fuzzer yields random strings beginning with
the given :attr:`prefix`, followed by :attr:`length` charactes chosen
from the :attr:`chars` character set,
and ending with the given :attr:`suffix`.
.. attribute:: length
int, the length of the random part
.. attribute:: prefix
text, an optional prefix to prepend to the random part
.. attribute:: suffix
text, an optional suffix to append to the random part
.. attribute:: chars
char iterable, the chars to choose from; defaults to the list of ascii
letters and numbers.
FuzzyChoice
-----------
.. class:: FuzzyChoice(choices)
The :class:`FuzzyChoice` fuzzer yields random choices from the given
iterable.
.. note:: The passed in :attr:`choices` will be converted into a list at
declaration time.
.. attribute:: choices
The list of choices to select randomly
FuzzyInteger
------------
.. class:: FuzzyInteger(low[, high])
The :class:`FuzzyInteger` fuzzer generates random integers within a given
inclusive range.
The :attr:`low` bound may be omitted, in which case it defaults to 0:
.. code-block:: pycon
>>> FuzzyInteger(0, 42)
>>> fi.low, fi.high
0, 42
>>> fi = FuzzyInteger(42)
>>> fi.low, fi.high
0, 42
.. attribute:: low
int, the inclusive lower bound of generated integers
.. attribute:: high
int, the inclusive higher bound of generated integers
FuzzyDecimal
------------
.. class:: FuzzyDecimal(low[, high])
The :class:`FuzzyDecimal` fuzzer generates random integers within a given
inclusive range.
The :attr:`low` bound may be omitted, in which case it defaults to 0:
.. code-block:: pycon
>>> FuzzyDecimal(0.5, 42.7)
>>> fi.low, fi.high
0.5, 42.7
>>> fi = FuzzyDecimal(42.7)
>>> fi.low, fi.high
0.0, 42.7
>>> fi = FuzzyDecimal(0.5, 42.7, 3)
>>> fi.low, fi.high, fi.precision
0.5, 42.7, 3
.. attribute:: low
decimal, the inclusive lower bound of generated decimals
.. attribute:: high
decimal, the inclusive higher bound of generated decimals
.. attribute:: precision
int, the number of digits to generate after the dot. The default is 2 digits.
FuzzyDate
---------
.. class:: FuzzyDate(start_date[, end_date])
The :class:`FuzzyDate` fuzzer generates random dates within a given
inclusive range.
The :attr:`end_date` bound may be omitted, in which case it defaults to the current date:
.. code-block:: pycon
>>> fd = FuzzyDate(datetime.date(2008, 1, 1))
>>> fd.start_date, fd.end_date
datetime.date(2008, 1, 1), datetime.date(2013, 4, 16)
.. attribute:: start_date
:class:`datetime.date`, the inclusive lower bound of generated dates
.. attribute:: end_date
:class:`datetime.date`, the inclusive higher bound of generated dates
FuzzyDateTime
-------------
.. class:: FuzzyDateTime(start_dt[, end_dt], tz=UTC, force_year=None, force_month=None, force_day=None, force_hour=None, force_minute=None, force_second=None, force_microsecond=None)
The :class:`FuzzyDateTime` fuzzer generates random timezone-aware datetime within a given
inclusive range.
The :attr:`end_dt` bound may be omitted, in which case it defaults to ``datetime.datetime.now()``
localized into the UTC timezone.
.. code-block:: pycon
>>> fdt = FuzzyDateTime(datetime.datetime(2008, 1, 1, tzinfo=UTC))
>>> fdt.start_dt, fdt.end_dt
datetime.datetime(2008, 1, 1, tzinfo=UTC), datetime.datetime(2013, 4, 21, 19, 13, 32, 458487, tzinfo=UTC)
The ``force_XXX`` keyword arguments force the related value of generated datetimes:
.. code-block:: pycon
>>> fdt = FuzzyDateTime(datetime.datetime(2008, 1, 1, tzinfo=UTC), datetime.datetime(2009, 1, 1, tzinfo=UTC),
... force_day=3, force_second=42)
>>> fdt.evaluate(2, None, False) # Actual code used by ``SomeFactory.build()``
datetime.datetime(2008, 5, 3, 12, 13, 42, 124848, tzinfo=UTC)
.. attribute:: start_dt
:class:`datetime.datetime`, the inclusive lower bound of generated datetimes
.. attribute:: end_dt
:class:`datetime.datetime`, the inclusive upper bound of generated datetimes
.. attribute:: force_year
int or None; if set, forces the :attr:`~datetime.datetime.year` of generated datetime.
.. attribute:: force_month
int or None; if set, forces the :attr:`~datetime.datetime.month` of generated datetime.
.. attribute:: force_day
int or None; if set, forces the :attr:`~datetime.datetime.day` of generated datetime.
.. attribute:: force_hour
int or None; if set, forces the :attr:`~datetime.datetime.hour` of generated datetime.
.. attribute:: force_minute
int or None; if set, forces the :attr:`~datetime.datetime.minute` of generated datetime.
.. attribute:: force_second
int or None; if set, forces the :attr:`~datetime.datetime.second` of generated datetime.
.. attribute:: force_microsecond
int or None; if set, forces the :attr:`~datetime.datetime.microsecond` of generated datetime.
FuzzyNaiveDateTime
------------------
.. class:: FuzzyNaiveDateTime(start_dt[, end_dt], force_year=None, force_month=None, force_day=None, force_hour=None, force_minute=None, force_second=None, force_microsecond=None)
The :class:`FuzzyNaiveDateTime` fuzzer generates random naive datetime within a given
inclusive range.
The :attr:`end_dt` bound may be omitted, in which case it defaults to ``datetime.datetime.now()``:
.. code-block:: pycon
>>> fdt = FuzzyNaiveDateTime(datetime.datetime(2008, 1, 1))
>>> fdt.start_dt, fdt.end_dt
datetime.datetime(2008, 1, 1), datetime.datetime(2013, 4, 21, 19, 13, 32, 458487)
The ``force_XXX`` keyword arguments force the related value of generated datetimes:
.. code-block:: pycon
>>> fdt = FuzzyNaiveDateTime(datetime.datetime(2008, 1, 1), datetime.datetime(2009, 1, 1),
... force_day=3, force_second=42)
>>> fdt.evaluate(2, None, False) # Actual code used by ``SomeFactory.build()``
datetime.datetime(2008, 5, 3, 12, 13, 42, 124848)
.. attribute:: start_dt
:class:`datetime.datetime`, the inclusive lower bound of generated datetimes
.. attribute:: end_dt
:class:`datetime.datetime`, the inclusive upper bound of generated datetimes
.. attribute:: force_year
int or None; if set, forces the :attr:`~datetime.datetime.year` of generated datetime.
.. attribute:: force_month
int or None; if set, forces the :attr:`~datetime.datetime.month` of generated datetime.
.. attribute:: force_day
int or None; if set, forces the :attr:`~datetime.datetime.day` of generated datetime.
.. attribute:: force_hour
int or None; if set, forces the :attr:`~datetime.datetime.hour` of generated datetime.
.. attribute:: force_minute
int or None; if set, forces the :attr:`~datetime.datetime.minute` of generated datetime.
.. attribute:: force_second
int or None; if set, forces the :attr:`~datetime.datetime.second` of generated datetime.
.. attribute:: force_microsecond
int or None; if set, forces the :attr:`~datetime.datetime.microsecond` of generated datetime.
Custom fuzzy fields
-------------------
Alternate fuzzy fields may be defined.
They should inherit from the :class:`BaseFuzzyAttribute` class, and override its
:meth:`~BaseFuzzyAttribute.fuzz` method.
.. class:: BaseFuzzyAttribute
Base class for all fuzzy attributes.
.. method:: fuzz(self)
The method responsible for generating random values.
*Must* be overridden in subclasses.
|