simply test suite

Regenerate lock file for 3.6

.travis.yml

@@ -4,6 +4,6 @@ python:
   - "3.6"
 
 # command to install dependencies
-install: pip install pipenv; pipenv install --dev
+install: pip install pipenv; pipenv lock; pipenv install --dev
 # command to run tests
 script: pipenv run pytest

Pipfile.lock

@@ -1,102 +1,72 @@
 {
     "_meta": {
+        "hash": {
+            "sha256": "5617ff73ba51e60721267b24dc01e83f33d2a3692870b60e394b0f75ed2dc313"
+        },
+        "requires": {},
         "sources": [
             {
                 "url": "https://pypi.python.org/simple",
                 "verify_ssl": true
             }
-        ],
-        "requires": {},
-        "hash": {
-            "sha256": "5617ff73ba51e60721267b24dc01e83f33d2a3692870b60e394b0f75ed2dc313"
-        }
+        ]
     },
     "default": {
-        "convertdate": {
-            "hash": "sha256:9c5d8dc984e51789ffaa92e988939ba8734c56ed718a3943998e7832fffa66ed",
-            "version": "==2.1.0"
-        },
         "dateparser": {
-            "hash": "sha256:bbdb38e35dcf42653bbc88dc8870d0ef7eb5679af64b4f2ffc43d43acd3b24ba",
-            "version": "==0.5.1"
-        },
-        "ephem": {
-            "hash": "sha256:7a4c82b1def2893e02aec0394f108d24adb17bd7b0ca6f4bc78eb7120c0212ac",
-            "version": "==3.7.6.0"
+            "version": "==0.6.0"
         },
         "humanize": {
-            "hash": "sha256:a43f57115831ac7c70de098e6ac46ac13be00d69abbf60bdcac251344785bb19",
             "version": "==0.5.1"
         },
-        "jdatetime": {
-            "hash": "sha256:b6bb0bbd822eb0d3f9a55c4e8bfda0ccace3dcfa6d16bdcb29c124ad2ce66335",
-            "version": "==1.8.1"
-        },
         "pendulum": {
-            "hash": "sha256:2417888ceddbb9c3903317ad321e27b2217aacf4ddcc1993ac3ad4db96f3a701",
-            "version": "==1.0.2"
+            "version": "==1.2.0"
         },
         "python-dateutil": {
-            "hash": "sha256:537bf2a8f8ce6f6862ad705cd68f9e405c0b5db014aa40fa29eab4335d4b1716",
             "version": "==2.6.0"
         },
         "pytz": {
-            "hash": "sha256:a1ea35e87a63c7825846d5b5c81d23d668e8a102d3b1b465ce95afe1b3a2e065",
-            "version": "==2016.10"
+            "version": "==2017.2"
         },
         "pytzdata": {
-            "hash": "sha256:cf28a9bbb4e7f94ae21f4a3c64439aa44f81d5814fe9989e9ab7374658b6e596",
-            "version": "==2016.10"
+            "version": "==2017.2"
         },
         "regex": {
-            "hash": "sha256:45b62acff46cb886246e40227a872089d8d4972dbf2f114ec1ae64e5893e87bf",
-            "version": "==2017.02.08"
+            "version": "==2017.04.29"
+        },
+        "ruamel.ordereddict": {
+            "version": "==0.4.9"
         },
         "ruamel.yaml": {
-            "hash": "sha256:7cfd653648a1d4a635ce7ae254b4dc6ec7df931a5a653c79e627547be5dda71b",
-            "version": "==0.13.13"
+            "version": "==0.14.12"
         },
         "six": {
-            "hash": "sha256:0ff78c403d9bccf5a425a6d31a12aa6b47f1c21ca4dc2573a7e2f32a97335eb1",
             "version": "==1.10.0"
         },
         "tzlocal": {
-            "hash": "sha256:d160c2ce4f8b1831dabfe766bd844cf9012f766539cf84139c2faac5201882ce",
-            "version": "==1.3"
-        },
-        "umalqurra": {
-            "hash": "sha256:719f6a36f908ada1c29dae0d934dd0f1e1f6e3305784edbec23ad719397de678",
-            "version": "==0.2"
+            "version": "==1.4"
         }
     },
     "develop": {
         "appdirs": {
-            "hash": "sha256:85e58578db8f29538f3109c11250c2a5514a2fcdc9890d9b2fe777eb55517736",
-            "version": "==1.4.0"
+            "version": "==1.4.3"
         },
         "packaging": {
-            "hash": "sha256:99276dc6e3a7851f32027a68f1095cd3f77c148091b092ea867a351811cfe388",
             "version": "==16.8"
         },
         "py": {
-            "hash": "sha256:2d4bba2e25fff58140e6bdce1e485e89bb59776adbe01d490baa6b1f37a3dd6b",
-            "version": "==1.4.32"
+            "version": "==1.4.33"
         },
         "pyparsing": {
-            "hash": "sha256:67101d7acee692962f33dd30b5dce079ff532dd9aa99ff48d52a3dad51d2fe84",
-            "version": "==2.1.10"
+            "version": "==2.2.0"
         },
         "pytest": {
-            "hash": "sha256:da0ab50c7eec0683bc24f1c1137db1f4111752054ecdad63125e7ec71316b813",
-            "version": "==3.0.6"
+            "version": "==3.0.7"
         },
         "setuptools": {
-            "hash": "sha256:5f74aabe68c441b99dca68c22796d5cbf532cb38b0aeada17d1d3988809de6e6",
-            "version": "==34.1.1"
+            "version": "==35.0.2"
         },
         "six": {
-            "hash": "sha256:0ff78c403d9bccf5a425a6d31a12aa6b47f1c21ca4dc2573a7e2f32a97335eb1",
             "version": "==1.10.0"
         }
     }
-}
+}

README.rst

@@ -1,5 +1,5 @@
-Maya: Timestamps for Humans™
-============================
+Maya: Datetimes for Humans™
+===========================
 
 .. image:: https://img.shields.io/pypi/v/maya.svg
     :target: https://pypi.python.org/pypi/maya
@@ -73,6 +73,32 @@ Behold, datetimes for humans!
     >>> rand_day.timezone
     UTC
 
+    # Range of hours in a day:
+    >>> maya.interval(start=maya.now(), end=maya.now().add(days=1), interval=60*60)
+    <generator object intervals at 0x105ba5820>
+
+☤ Advanced Usage of Maya
+------------------------
+
+In addition to timestamps, Maya also includes a wonderfuly powerful ``MayaInterval`` class, which represents a range of time (e.g. an event). With this class, you can perform a multitude of advanced calendar calculations with finese and ease. 
+
+For example:
+
+.. code-block:: pycon
+
+    >>> from maya import MayaInterval
+
+    # Create an event that is one hour long, starting now. 
+    >>> event_start = maya.now()
+    >>> event_end = event_start.add(hours=1)
+    
+    >>> event = MayaInterval(start=event_start, end=event_end)
+
+From here, there a a number of methods available to you, which you can use to compare this event to another event.
+    
+    
+    
+
 ☤ Why is this useful?
 ---------------------
 
@@ -88,11 +114,13 @@ Behold, datetimes for humans!
 ☤ What about Delorean, Arrow, & Pendulum?
 -----------------------------------------
 
+All these project complement eachother, and are friends. Pendulum, for example, helps power Maya's parsing. 
+
 Arrow, for example, is a fantastic library, but isn't what I wanted in a datetime library. In many ways, it's better than Maya for certain things. In some ways, in my opinion, it's not.
 
 I simply desire a sane API for datetimes that made sense to me for all the things I'd ever want to do—especially when dealing with timezone algebra. Arrow doesn't do all of the things I need (but it does a lot more!). Maya does do exactly what I need.
 
-I think these projects complement each-other, personally. Maya is great for parsing websites. For example- Arrow supports floors and ceilings and spans of dates, which Maya does not at all.
+I think these projects complement each-other, personally. Maya is great for parsing websites, and dealing with calendar events!
 
 
 ☤ Installing Maya

compat.py

@@ -0,0 +1,100 @@
+# -*- coding: utf-8 -*-
+
+"""
+maya.compat
+~~~~~~~~~~~~~~~
+This module handles import compatibility issues between Python 2 and
+Python 3.
+"""
+
+import sys
+
+# -------
+# Pythons
+# -------
+
+# Syntax sugar.
+_ver = sys.version_info
+
+#: Python 2.x?
+is_py2 = (_ver[0] == 2)
+
+#: Python 3.x?
+is_py3 = (_ver[0] == 3)
+
+# ---------
+# Specifics
+# ---------
+
+if is_py2:
+    cmp = cmp
+
+elif is_py3:
+    def cmp(a, b):
+        """
+        Compare two objects.
+        Returns a negative number if C{a < b}, zero if they are equal, and a
+        positive number if C{a > b}.
+        """
+        if a < b:
+            return -1
+        elif a == b:
+            return 0
+        else:
+            return 1
+
+
+def comparable(klass):
+    """
+    Class decorator that ensures support for the special C{__cmp__} method.
+    On Python 2 this does nothing.
+    On Python 3, C{__eq__}, C{__lt__}, etc. methods are added to the class,
+    relying on C{__cmp__} to implement their comparisons.
+    """
+    # On Python 2, __cmp__ will just work, so no need to add extra methods:
+    if not is_py3:
+        return klass
+
+    def __eq__(self, other):
+        c = self.__cmp__(other)
+        if c is NotImplemented:
+            return c
+        return c == 0
+
+    def __ne__(self, other):
+        c = self.__cmp__(other)
+        if c is NotImplemented:
+            return c
+        return c != 0
+
+    def __lt__(self, other):
+        c = self.__cmp__(other)
+        if c is NotImplemented:
+            return c
+        return c < 0
+
+    def __le__(self, other):
+        c = self.__cmp__(other)
+        if c is NotImplemented:
+            return c
+        return c <= 0
+
+    def __gt__(self, other):
+        c = self.__cmp__(other)
+        if c is NotImplemented:
+            return c
+        return c > 0
+
+    def __ge__(self, other):
+        c = self.__cmp__(other)
+        if c is NotImplemented:
+            return c
+        return c >= 0
+
+    klass.__lt__ = __lt__
+    klass.__gt__ = __gt__
+    klass.__le__ = __le__
+    klass.__ge__ = __ge__
+    klass.__eq__ = __eq__
+    klass.__ne__ = __ne__
+    return klass

maya.py

@@ -1,4 +1,3 @@
-
 # ___  __  ___  _  _  ___
 # || \/ | ||=|| \\// ||=||
 # ||    | || ||  //  || ||
@@ -6,19 +5,22 @@
 # Ignore warnings for yaml usage.
 import warnings
 import ruamel.yaml
-warnings.simplefilter('ignore', ruamel.yaml.error.UnsafeLoaderWarning)
 
+warnings.simplefilter('ignore', ruamel.yaml.error.UnsafeLoaderWarning)
 
 import email.utils
 import time
-from datetime import datetime as Datetime
+from datetime import timedelta, datetime as Datetime
 
+import functools
 import pytz
 import humanize
 import dateparser
 import pendulum
 from tzlocal import get_localzone
 
+from compat import cmp, comparable
+
 _EPOCH_START = (1970, 1, 1)
 
 
@@ -41,7 +43,6 @@ def validate_class_type_arguments(operator):
     return inner
 
 
-
 class MayaDT(object):
     """The Maya Datetime object."""
 
@@ -59,10 +60,9 @@ class MayaDT(object):
         """Return's the datetime's format"""
         return format(self.datetime(), *args, **kwargs)
 
-
     @validate_class_type_arguments('==')
     def __eq__(self, maya_dt):
-        return self._epoch == maya_dt._epoch
+        return int(self._epoch) == int(maya_dt._epoch)
 
     @validate_class_type_arguments('!=')
     def __ne__(self, maya_dt):
@@ -84,6 +84,19 @@ class MayaDT(object):
     def __ge__(self, maya_dt):
         return self._epoch >= maya_dt._epoch
 
+    def __hash__(self):
+        return hash(int(self.epoch))
+
+    def __add__(self, item):
+        return self.add(seconds=seconds_or_timedelta(item).total_seconds())
+
+    def __radd__(self, item):
+        return self + item
+
+    def __sub__(self, item):
+        return self.subtract(
+            seconds=seconds_or_timedelta(item).total_seconds())
+
     def add(self, **kwargs):
         """"Returns a new MayaDT object with the given offsets."""
         return self.from_datetime(pendulum.instance(self.datetime()).add(**kwargs))
@@ -187,7 +200,7 @@ class MayaDT(object):
 
     def rfc3339(self):
         """Returns an RFC 3339 representation of the MayaDT."""
-        return self.datetime().strftime("%Y-%m-%dT%H:%M:%S.%f")[:-4]+"Z"
+        return self.datetime().strftime("%Y-%m-%dT%H:%M:%S.%f")[:-4] + "Z"
 
     # Properties
     # ----------
@@ -247,6 +260,263 @@ class MayaDT(object):
         return humanize.naturaltime(dt)
 
 
+def to_utc_offset_naive(dt):
+    if dt.tzinfo is None:
+        return dt
+    return dt.astimezone(pytz.utc).replace(tzinfo=None)
+
+
+def to_utc_offset_aware(dt):
+    if dt.tzinfo is not None:
+        return dt
+    return pytz.utc.localize(dt)
+
+
+def to_iso8601(dt):
+    return to_utc_offset_naive(dt).isoformat() + 'Z'
+
+
+def end_of_day_midnight(dt):
+    return dt if dt.time() == time.min else \
+        (dt.replace(hour=0, minute=0, second=0, microsecond=0) + timedelta(days=1))
+
+
+@comparable
+class MayaInterval(object):
+    """
+    A MayaInterval represents a range between two datetimes, inclusive of the start
+    and exclusive of the end.
+    """
+
+    def __init__(self, start=None, end=None, duration=None):
+        try:
+            # Ensure that proper arguments were passed.
+            assert any((
+                (start and end),
+                (start and duration is not None),
+                (end and duration is not None),
+            ))
+            assert not all((start, end, duration is not None))
+        except AssertionError:
+            raise ValueError(
+                'Exactly 2 of start, end, and duration must be specified')
+
+        # Convert duration to timedelta if seconds were provided.
+        duration = seconds_or_timedelta(duration)
+
+        if not start:
+            start = end - duration
+
+        if not end:
+            end = start + duration
+
+        if start > end:
+            raise ValueError('MayaInterval cannot end before it starts')
+
+        self.start = start
+        self.end = end
+
+    def __repr__(self):
+        return '<MayaInterval start={0!r} end={1!r}>'.format(self.start, self.end)
+
+    def iso8601(self):
+        """Returns an ISO 8601 representation of the MayaInterval."""
+        return '{0}/{1}'.format(self.start.iso6801, self.end.iso8601)
+
+    @classmethod
+    def from_iso8601(cls, s):
+        # # Start and end, such as "2007-03-01T13:00:00Z/2008-05-11T15:30:00Z"
+        # start, end = s.split('/')
+        # try:
+        #     start = parse(start)
+        # except pendulum.parsing.exceptions.ParserError:
+        #     start = self._parse_iso8601_duration(start)
+        # try:
+        #     end = parse(start)
+        # except pendulum.parsing.exceptions.ParserError as e:
+        #     end = self._parse_iso8601_duration(start)
+
+        # # Start and duration, such as "2007-03-01T13:00:00Z/P1Y2M10DT2H30M"
+        # # Duration and end, such as "P1Y2M10DT2H30M/2008-05-11T15:30:00Z"
+        raise NotImplementedError()
+
+    def __and__(self, i):
+        return self.intersection(i)
+
+    def __or__(self, i):
+        return self.combine(i)
+
+    def __eq__(self, i):
+        return (
+            self.start == i.start and
+            self.end == i.end
+        )
+
+    def __hash__(self):
+        return hash((self.start, self.end))
+
+    def __iter__(self):
+        yield self.start
+        yield self.end
+
+    def __cmp__(self, i):
+        return (
+            cmp(self.start, i.start) or
+            cmp(self.end, i.end)
+        )
+
+    @property
+    def duration(self):
+        return self.timedelta.total_seconds()
+
+    @property
+    def timedelta(self):
+        return timedelta(seconds=(self.end.epoch - self.start.epoch))
+
+    @property
+    def is_instant(self):
+        return self.timedelta == timedelta(seconds=0)
+
+    def intersects(self, i):
+        return self & i is not None
+
+    @property
+    def midpoint(self):
+        return self.start.add(seconds=(self.duration / 2))
+
+    def combine(self, i):
+        """Returns a combined list of timespans, merged together."""
+        ii = sorted([self, i])
+        if self & i or self.is_adjacent(i):
+            return [
+                MayaInterval(
+                    ii[0].start,
+                    max(ii[0].end, ii[1].end),
+                ),
+            ]
+        return ii
+
+    def subtract(self, i):
+        """"Removes the given inerval."""
+        if not self & i:
+            return [self]
+        elif i.contains(self):
+            return []
+
+        ii = []
+        if self.start < i.start:
+            ii.append(MayaInterval(self.start, i.start))
+        if self.end > i.end:
+            ii.append(MayaInterval(i.end, self.end))
+        return ii
+
+    def split(self, duration, include_remainder=True):
+
+        # Convert seconds to timedelta, if appropriate.
+        duration = seconds_or_timedelta(duration)
+
+        assert duration > timedelta(seconds=0), 'cannot call split with a non-positive timedelta'
+        start = self.start
+        while start < self.end:
+            if start + duration <= self.end:
+                yield MayaInterval(start, start + duration)
+            elif include_remainder:
+                yield MayaInterval(start, self.end)
+            start += duration
+
+    def quantize(self, duration, snap_out=False, timezone='UTC'):
+        """Returns a quanitzed interval."""
+
+        # Convert seconds to timedelta, if appropriate.
+        duration = seconds_or_timedelta(duration)
+        timezone = pytz.timezone(timezone)
+
+        assert duration > timedelta(seconds=0), 'cannot quantize by non-positive timedelta'
+        epoch = timezone.localize(Datetime(1970, 1, 1))
+        seconds = int(duration.total_seconds())
+
+        start_seconds = int((self.start.datetime(naive=False) - epoch).total_seconds())
+        end_seconds = int((self.end.datetime(naive=False) - epoch).total_seconds())
+
+        if start_seconds % seconds and not snap_out:
+            start_seconds += seconds
+        if end_seconds % seconds and snap_out:
+            end_seconds += seconds
+
+        start_seconds -= start_seconds % seconds
+        end_seconds -= end_seconds % seconds
+
+        if start_seconds > end_seconds:
+            start_seconds = end_seconds
+
+        return MayaInterval(
+            start=MayaDT.from_datetime(epoch).add(seconds=start_seconds),
+            end=MayaDT.from_datetime(epoch).add(seconds=end_seconds),
+        )
+
+    def intersection(self, i):
+        """Returns the intersection between two intervals."""
+
+        start = max(self.start, i.start)
+        end = min(self.end, i.end)
+
+        either_instant = self.is_instant or i.is_instant
+        instant_overlap = (
+            self.start == i.start or
+            start <= end
+        )
+        if (either_instant and instant_overlap) or (start < end):
+            return MayaInterval(start, end)
+
+    def contains(self, i):
+        return (
+            self.start <= i.start and
+            self.end >= i.end
+        )
+
+    def __contains__(self, item):
+        if isinstance(item, MayaDT):
+            return self.contains_dt(item)
+
+        return self.contains(item)
+
+    def contains_dt(self, dt):
+        return self.start <= dt < self.end
+
+    def is_adjacent(self, i):
+        return (
+            self.start == i.end or
+            self.end == i.start
+        )
+
+    @property
+    def icalendar(self):
+        ical_dt_format = '%Y%m%dT%H%M%SZ'
+        return """
+        BEGIN:VCALENDAR
+        VERSION:2.0
+        BEGIN:VEVENT
+        DTSTART:{0}
+        DTEND:{1}
+        END:VEVENT
+        END:VCALENDAR
+        """.format(
+            self.start.datetime().strftime(ical_dt_format),
+            self.end.datetime().strftime(ical_dt_format),
+        ).replace(' ', '').strip('\r\n').replace('\n', '\r\n')
+
+    @staticmethod
+    def flatten(ii):
+        return functools.reduce(lambda reduced, i: (
+            (reduced[:-1] + i.combine(reduced[-1]))
+            if reduced else [i]
+        ), sorted(ii), [])
+
+    @classmethod
+    def from_datetime(cls, start_dt=None, end_dt=None, duration=None):
+        start = MayaDT.from_datetime(start_dt) if start_dt else None
+        end = MayaDT.from_datetime(end_dt) if end_dt else None
+        return cls(start=start, end=end, duration=duration)
 
 
 def now():
@@ -254,6 +524,7 @@ def now():
     epoch = time.time()
     return MayaDT(epoch=epoch)
 
+
 def when(string, timezone='UTC'):
     """"Returns a MayaDT instance for the human moment specified.
 
@@ -267,13 +538,15 @@ def when(string, timezone='UTC'):
         timezone -- timezone referenced from (default: 'UTC')
 
     """
-    dt = dateparser.parse(string, settings={'TIMEZONE': timezone, 'RETURN_AS_TIMEZONE_AWARE': True, 'TO_TIMEZONE': 'UTC'})
+    dt = dateparser.parse(string,
+                          settings={'TIMEZONE': timezone, 'RETURN_AS_TIMEZONE_AWARE': True, 'TO_TIMEZONE': 'UTC'})
 
     if dt is None:
         raise ValueError('invalid datetime input specified.')
 
     return MayaDT.from_datetime(dt)
 
+
 def parse(string, day_first=False):
     """"Returns a MayaDT instance for the machine-produced moment specified.
 
@@ -285,3 +558,22 @@ def parse(string, day_first=False):
     """
     dt = pendulum.parse(string, day_first=day_first)
     return MayaDT.from_datetime(dt)
+
+
+def seconds_or_timedelta(s):
+    # Convert seconds into timedelta.
+    if isinstance(s, int):
+        s = timedelta(seconds=s)
+
+    return s
+
+
+def intervals(start, end, interval):
+    """Yields MayaDT objects between the start and end MayaDTs given, at a given interval (seconds or timedelta)."""
+
+    interval = seconds_or_timedelta(interval)
+
+    current_timestamp = start
+    while current_timestamp.epoch < end.epoch:
+        yield current_timestamp
+        current_timestamp = current_timestamp.add(seconds=interval.seconds)

setup.py

@@ -35,11 +35,11 @@ required = [
 
 setup(
     name='maya',
-    version='0.1.8',
+    version='0.3.1',
     description='Datetimes for Humans.',
     long_description=long_description,
     author='Kenneth Reitz',
-    author_email='me@kennethreitz.com',
+    author_email='me@kennethreitz.org',
     url='https://github.com/kennethreitz/maya',
     py_modules=['maya'],
     install_requires=required,

test_maya.py

@@ -1,5 +1,6 @@
 import pytest
 import copy
+from datetime import timedelta
 
 import maya
 
@@ -79,7 +80,7 @@ def test_machine_parse():
 
 def test_dt_tz_translation():
     d1 = maya.now().datetime()
-    d2 = maya.now().datetime(to_timezone='US/Eastern')
+    d2 = maya.now().datetime(to_timezone='EST')
     assert (d1.hour - d2.hour) % 24 == 5
 
 
@@ -87,7 +88,7 @@ def test_dt_tz_naive():
     d1 = maya.now().datetime(naive=True)
     assert d1.tzinfo is None
 
-    d2 = maya.now().datetime(to_timezone='US/Eastern', naive=True)
+    d2 = maya.now().datetime(to_timezone='EST', naive=True)
     assert d2.tzinfo is None
     assert (d1.hour - d2.hour) % 24 == 5
 
@@ -202,3 +203,27 @@ def test_comparison_operations():
         now > 1
     with pytest.raises(TypeError):
         now >= 1
+
+def test_intervals():
+    now = maya.now()
+    tomorrow = now.add(days=1)
+
+    assert len(list(maya.intervals(now, tomorrow, 60*60))) == 24
+
+
+def test_dunder_add():
+    now = maya.now()
+    assert now + 1 == now.add(seconds=1)
+    assert now + timedelta(seconds=1) == now.add(seconds=1)
+
+
+def test_dunder_radd():
+    now = maya.now()
+    assert now.add(seconds=1) == now + 1
+    assert now.add(seconds=1) == now + timedelta(seconds=1)
+
+
+def test_dunder_sub():
+    now = maya.now()
+    assert now - 1 == now.subtract(seconds=1)
+    assert now - timedelta(seconds=1) == now.subtract(seconds=1)

test_maya_interval.py

@@ -0,0 +1,541 @@
+import random
+from datetime import datetime, timedelta
+
+import pytest
+import pytz
+
+import maya
+from compat import cmp
+
+Los_Angeles = pytz.timezone('America/Los_Angeles')
+New_York = pytz.timezone('America/New_York')
+Melbourne = pytz.timezone('Australia/Melbourne')
+
+
+def test_interval_requires_2_of_start_end_duration():
+    start = maya.now()
+    end = start.add(hours=1)
+
+    with pytest.raises(ValueError):
+        maya.MayaInterval(start=start)
+
+    with pytest.raises(ValueError):
+        maya.MayaInterval(end=end)
+
+    with pytest.raises(ValueError):
+        maya.MayaInterval(duration=60)
+
+    with pytest.raises(ValueError):
+        maya.MayaInterval(start=start, end=end, duration=60)
+
+    maya.MayaInterval(start=start, end=end)
+    maya.MayaInterval(start=start, duration=60)
+    maya.MayaInterval(end=end, duration=60)
+
+
+def test_interval_requires_end_time_after_or_on_start_time():
+
+    with pytest.raises(ValueError):
+        maya.MayaInterval(start=maya.now(), duration=0)
+        maya.MayaInterval(start=maya.now(), duration=-1)
+
+
+def test_interval_init_start_end():
+    start = maya.now()
+    end = start.add(hours=1)
+    interval = maya.MayaInterval(start=start, end=end)
+    assert interval.start == start
+    assert interval.end == end
+
+
+def test_interval_init_start_duration():
+    start = maya.now()
+    duration = 1
+    interval = maya.MayaInterval(start=start, duration=duration)
+    assert interval.start == start
+    assert interval.end == start.add(seconds=duration)
+
+
+def test_interval_init_end_duration():
+    end = maya.now()
+    duration = 1
+    interval = maya.MayaInterval(end=end, duration=duration)
+    assert interval.end == end
+    assert interval.start == end.subtract(seconds=duration)
+
+
+@pytest.mark.parametrize('start_doy1,end_doy1,start_doy2,end_doy2,intersection_doys', (
+        (0, 2, 1, 3, (1, 2)),
+        (0, 2, 3, 4, None),
+        (0, 2, 2, 3, None),
+        (0, 1, 0, 1, (0, 1)),
+        (1, 1, 1, 3, (1, 1)),
+        (1, 1, 1, 1, (1, 1)),
+        (1, 1, 2, 3, None),
+        (2, 2, 1, 3, (2, 2)),
+        (1, 3, 1, 1, (1, 1)),
+        (2, 3, 1, 1, None),
+        (1, 3, 2, 2, (2, 2)),
+), ids=(
+        'overlapping',
+        'non-overlapping',
+        'adjacent',
+        'equal',
+        'instant overlapping start only',
+        'instant equal',
+        'instant disjoint',
+        'instant overlapping',
+        'instant overlapping start only (left)',
+        'instant disjoint (left)',
+        'instant overlapping (left)'
+))
+def test_interval_intersection(
+        start_doy1, end_doy1, start_doy2, end_doy2, intersection_doys
+):
+    base = maya.MayaDT.from_datetime(datetime(2016, 1, 1))
+    interval1 = maya.MayaInterval(
+        base.add(days=start_doy1),
+        base.add(days=end_doy1),
+    )
+    interval2 = maya.MayaInterval(
+        base.add(days=start_doy2),
+        base.add(days=end_doy2),
+    )
+
+    if intersection_doys:
+        start_doy_intersection, end_doy_intersection = intersection_doys
+        assert interval1 & interval2 == maya.MayaInterval(
+            base.add(days=start_doy_intersection),
+            base.add(days=end_doy_intersection),
+        )
+    else:
+        assert (interval1 & interval2) is None
+
+
+def test_interval_intersects():
+    base = maya.MayaDT.from_datetime(datetime(2016, 1, 1))
+    interval = maya.MayaInterval(base, base.add(days=1))
+
+    assert interval.intersects(interval)
+    assert not interval.intersects(maya.MayaInterval(
+        base.add(days=2),
+        base.add(days=3),
+    ))
+
+
+def test_and_operator():
+    base = maya.MayaDT.from_datetime(datetime(2016, 1, 1))
+    interval1 = maya.MayaInterval(base, base.add(days=2))
+    interval2 = maya.MayaInterval(base.add(days=1), base.add(days=3))
+
+    assert (
+        interval1 & interval2 ==
+        interval2 & interval1 ==
+        interval1.intersection(interval2)
+    )
+
+
+def test_interval_eq_operator():
+    start = maya.now()
+    end = start.add(hours=1)
+    interval = maya.MayaInterval(start=start, end=end)
+
+    assert interval == maya.MayaInterval(start=start, end=end)
+    assert interval != maya.MayaInterval(start=start, end=end.add(days=1))
+
+
+def test_interval_timedelta():
+    start = maya.now()
+    delta = timedelta(hours=1)
+    interval = maya.MayaInterval(start=start, duration=delta)
+
+    assert interval.timedelta == delta
+
+
+def test_interval_duration():
+    start = maya.now()
+    delta = timedelta(hours=1)
+    interval = maya.MayaInterval(start=start, duration=delta)
+
+    assert interval.duration == delta.total_seconds()
+
+
+@pytest.mark.parametrize('start_doy1,end_doy1,start_doy2,end_doy2,expected', (
+        (0, 2, 1, 3, False),
+        (0, 2, 3, 4, False),
+        (0, 2, 2, 3, False),
+        (0, 1, 0, 1, True),
+        (0, 3, 1, 2, True),
+), ids=(
+        'overlapping',
+        'non-overlapping',
+        'adjacent',
+        'equal',
+        'subset',
+))
+def test_interval_contains(
+        start_doy1, end_doy1, start_doy2, end_doy2, expected
+):
+    base = maya.MayaDT.from_datetime(datetime(2016, 1, 1))
+    interval1 = maya.MayaInterval(
+        base.add(days=start_doy1),
+        base.add(days=end_doy1),
+    )
+    interval2 = maya.MayaInterval(
+        base.add(days=start_doy2),
+        base.add(days=end_doy2),
+    )
+
+    assert interval1.contains(interval2) is expected
+    assert (interval2 in interval1) is expected
+
+
+@pytest.mark.parametrize('start_doy,end_doy,dt_doy,expected', (
+        (2, 4, 1, False),
+        (2, 4, 2, True),
+        (2, 4, 3, True),
+        (2, 4, 4, False),
+        (2, 4, 5, False),
+), ids=(
+        'before-start',
+        'on-start',
+        'during',
+        'on-end',
+        'after-end',
+))
+def test_interval_in_operator_maya_dt(
+        start_doy, end_doy, dt_doy, expected
+):
+    base = maya.MayaDT.from_datetime(datetime(2016, 1, 1))
+    interval = maya.MayaInterval(
+        start=base.add(days=start_doy),
+        end=base.add(days=end_doy),
+    )
+    dt = base.add(days=dt_doy)
+
+    assert (dt in interval) is expected
+
+
+def test_interval_hash():
+    start = maya.now()
+    end = start.add(hours=1)
+    interval = maya.MayaInterval(start=start, end=end)
+
+    assert hash(interval) == hash(maya.MayaInterval(start=start, end=end))
+    assert hash(interval) != hash(maya.MayaInterval(
+        start=start, end=end.add(days=1)))
+
+
+def test_interval_iter():
+    start = maya.now()
+    end = start.add(days=1)
+
+    assert tuple(maya.MayaInterval(start=start, end=end)) == (start, end)
+
+
+@pytest.mark.parametrize('start1,end1,start2,end2,expected', [
+    (1, 2, 1, 2, 0),
+    (1, 3, 2, 4, -1),
+    (2, 4, 1, 3, 1),
+    (1, 2, 1, 3, -1),
+], ids=(
+        'equal',
+        'less-than',
+        'greater-than',
+        'use-end-time-if-start-time-identical',
+))
+def test_interval_cmp(start1, end1, start2, end2, expected):
+    base = maya.now()
+    interval1 = maya.MayaInterval(
+        start=base.add(days=start1),
+        end=base.add(days=end1),
+    )
+    interval2 = maya.MayaInterval(
+        start=base.add(days=start2),
+        end=base.add(days=end2),
+    )
+    assert cmp(interval1, interval2) == expected
+
+
+@pytest.mark.parametrize('start1,end1,start2,end2,expected', [
+    (1, 2, 2, 3, [(1, 3)]),
+    (1, 3, 2, 4, [(1, 4)]),
+    (1, 2, 3, 4, [(1, 2), (3, 4)]),
+    (1, 5, 2, 3, [(1, 5)]),
+], ids=(
+        'adjacent',
+        'overlapping',
+        'non-overlapping',
+        'contains',
+))
+def test_interval_combine(start1, end1, start2, end2, expected):
+    base = maya.now()
+    interval1 = maya.MayaInterval(
+        start=base.add(days=start1),
+        end=base.add(days=end1),
+    )
+    interval2 = maya.MayaInterval(
+        start=base.add(days=start2),
+        end=base.add(days=end2),
+    )
+    expected_intervals = [maya.MayaInterval(
+        start=base.add(days=start),
+        end=base.add(days=end),
+    ) for start, end in expected]
+
+    assert interval1.combine(interval2) == expected_intervals
+    assert interval2.combine(interval1) == expected_intervals
+
+
+@pytest.mark.parametrize('start1,end1,start2,end2,expected', [
+    (1, 2, 3, 4, [(1, 2)]),
+    (1, 2, 2, 4, [(1, 2)]),
+    (2, 3, 1, 4, []),
+    (1, 4, 2, 3, [(1, 2), (3, 4)]),
+    (1, 4, 0, 2, [(2, 4)]),
+    (1, 4, 3, 5, [(1, 3)]),
+    (1, 4, 1, 2, [(2, 4)]),
+    (1, 4, 3, 4, [(1, 3)]),
+], ids=(
+        'non-overlapping',
+        'adjacent',
+        'contains',
+        'splits',
+        'overlaps-left',
+        'overlaps-right',
+        'overlaps-left-identical-start',
+        'overlaps-right-identical-end',
+))
+def test_interval_subtract(start1, end1, start2, end2, expected):
+    base = maya.now()
+    interval1 = maya.MayaInterval(
+        start=base.add(days=start1),
+        end=base.add(days=end1),
+    )
+    interval2 = maya.MayaInterval(
+        start=base.add(days=start2),
+        end=base.add(days=end2),
+    )
+    expected_intervals = [maya.MayaInterval(
+        start=base.add(days=start),
+        end=base.add(days=end),
+    ) for start, end in expected]
+
+    assert interval1.subtract(interval2) == expected_intervals
+
+
+@pytest.mark.parametrize('start1,end1,start2,end2,expected', [
+    (1, 2, 2, 3, True),
+    (2, 3, 1, 2, True),
+    (1, 3, 2, 3, False),
+    (2, 3, 4, 5, False),
+], ids=(
+        'adjacent-right',
+        'adjacent-left',
+        'overlapping',
+        'non-overlapping',
+))
+def test_interval_is_adjacent(start1, end1, start2, end2, expected):
+    base = maya.now()
+    interval1 = maya.MayaInterval(
+        start=base.add(days=start1),
+        end=base.add(days=end1),
+    )
+    interval2 = maya.MayaInterval(
+        start=base.add(days=start2),
+        end=base.add(days=end2),
+    )
+    assert interval1.is_adjacent(interval2) == expected
+
+
+@pytest.mark.parametrize('start,end,delta,include_remainder,expected', [
+    (0, 10, 5, False, [(0, 5), (5, 10)]),
+    (0, 10, 5, True, [(0, 5), (5, 10)]),
+    (0, 10, 3, False, [(0, 3), (3, 6), (6, 9)]),
+    (0, 10, 3, True, [(0, 3), (3, 6), (6, 9), (9, 10)]),
+    (0, 2, 5, False, []),
+    (0, 2, 5, True, [(0, 2)]),
+], ids=(
+        'even-split',
+        'even-split-include-partial',
+        'uneven-split-do-not-include-partial',
+        'uneven-split-include-partial',
+        'delta-larger-than-timepsan-do-not-include-partial',
+        'delta-larger-than-timepsan-include-partial',
+))
+def test_interval_split(start, end, delta, include_remainder, expected):
+    base = maya.now()
+    interval = maya.MayaInterval(
+        start=base.add(days=start),
+        end=base.add(days=end),
+    )
+    delta = timedelta(days=delta)
+
+    expected_intervals = [
+        maya.MayaInterval(
+            start=base.add(days=s),
+            end=base.add(days=e),
+        ) for s, e in expected
+    ]
+
+    assert expected_intervals == list(interval.split(
+        delta, include_remainder=include_remainder))
+
+
+def test_interval_split_non_positive_delta():
+    start = maya.now()
+    end = start.add(days=1)
+    interval = maya.MayaInterval(start=start, end=end)
+
+    with pytest.raises(AssertionError):
+        list(interval.split(timedelta(seconds=0)))
+
+    with pytest.raises(AssertionError):
+        list(interval.split(timedelta(seconds=-10)))
+
+
+@pytest.mark.parametrize('start,end,minutes,timezone,snap_out,expected_start,expected_end', [
+    ((5, 12), (8, 48), 30, None, False, (5, 30), (8, 30)),
+    ((5, 12), (8, 48), 30, None, True, (5, 0), (9, 0)),
+    ((5, 15), (9, 0), 15, None, False, (5, 15), (9, 0)),
+    ((5, 15), (9, 0), 15, None, True, (5, 15), (9, 0)),
+    ((6, 50), (9, 15), 60, 'America/New_York', False, (7, 0), (9, 0)),
+    ((6, 50), (9, 15), 60, 'America/New_York', True, (6, 0), (10, 0)),
+    ((6, 20), (6, 50), 60, None, False, (6, 0), (6, 0)),
+    ((6, 20), (6, 50), 60, None, True, (6, 0), (7, 0)),
+    ((6, 20), (6, 50), 60, 'America/Chicago', False, (6, 0), (6, 0)),
+    ((6, 20), (6, 50), 60, 'America/Chicago', True, (6, 0), (7, 0)),
+], ids=(
+        'normal',
+        'normal-snap_out',
+        'already-quantized',
+        'already-quantized-snap_out',
+        'with-timezone',
+        'with-timezone-snap_out',
+        'too-small',
+        'too-small-snap_out',
+        'too-small-with-timezone',
+        'too-small-with-timezone-snap_out',
+))
+def test_quantize(start, end, minutes, timezone, snap_out, expected_start, expected_end):
+    base = maya.MayaDT.from_datetime(datetime(2017, 1, 1))
+    interval = maya.MayaInterval(
+        start=base.add(hours=start[0], minutes=start[1]),
+        end=base.add(hours=end[0], minutes=end[1]),
+    )
+
+    kwargs = {'timezone': timezone} if timezone is not None else {}
+    quantized_interval = interval.quantize(
+        timedelta(minutes=minutes),
+        snap_out=snap_out,
+        **kwargs
+    )
+
+    assert quantized_interval == maya.MayaInterval(
+        start=base.add(hours=expected_start[0], minutes=expected_start[1]),
+        end=base.add(hours=expected_end[0], minutes=expected_end[1]),
+    )
+
+
+def test_quantize_invalid_delta():
+    start = maya.now()
+    end = start.add(days=1)
+    interval = maya.MayaInterval(start=start, end=end)
+
+    with pytest.raises(AssertionError):
+        interval.quantize(timedelta(minutes=0))
+    with pytest.raises(AssertionError):
+        interval.quantize(timedelta(minutes=-1))
+
+
+def test_interval_flatten_non_overlapping():
+    step = 2
+    max_hour = 20
+    base = maya.now()
+    intervals = [maya.MayaInterval(
+        start=base.add(hours=hour),
+        duration=timedelta(hours=step - 1),
+    ) for hour in range(0, max_hour, step)]
+    random.shuffle(intervals)
+
+    assert maya.MayaInterval.flatten(intervals) == sorted(intervals)
+
+
+def test_interval_flatten_adjacent():
+    step = 2
+    max_hour = 20
+    base = maya.when('jan/1/2011')
+
+    intervals = [
+        maya.MayaInterval(
+            start=base.add(hours=hour),
+            duration=timedelta(hours=step),
+        ) for hour in range(0, max_hour, step)
+    ]
+    random.shuffle(intervals)
+
+    assert maya.MayaInterval.flatten(intervals) == [maya.MayaInterval(
+        start=base,
+        duration=timedelta(hours=max_hour),
+    )]
+
+
+def test_interval_flatten_intersecting():
+    step = 2
+    max_hour = 20
+    base = maya.now()
+    intervals = [maya.MayaInterval(
+        start=base.add(hours=hour),
+        duration=timedelta(hours=step, minutes=30),
+    ) for hour in range(0, max_hour, step)]
+    random.shuffle(intervals)
+
+    assert maya.MayaInterval.flatten(intervals) == [maya.MayaInterval(
+        start=base,
+        duration=timedelta(hours=max_hour, minutes=30),
+    )]
+
+
+def test_interval_flatten_containing():
+    step = 2
+    max_hour = 20
+    base = maya.now()
+    containing_interval = maya.MayaInterval(
+        start=base,
+        end=base.add(hours=max_hour + step),
+    )
+    intervals = [maya.MayaInterval(
+        start=base.add(hours=hour),
+        duration=timedelta(hours=step - 1),
+    ) for hour in range(2, max_hour, step)]
+    intervals.append(containing_interval)
+    random.shuffle(intervals)
+
+    assert maya.MayaInterval.flatten(intervals) == [containing_interval]
+
+
+def test_interval_from_datetime():
+    start = maya.now()
+    duration = timedelta(hours=1)
+    end = start + duration
+
+    interval = maya.MayaInterval.from_datetime(
+        start_dt=start.datetime(naive=False),
+        end_dt=end.datetime(naive=False),
+    )
+    assert interval.start == start
+    assert interval.end == end
+
+    interval2 = maya.MayaInterval.from_datetime(
+        start_dt=start.datetime(naive=False),
+        duration=duration,
+    )
+    assert interval2.start == start
+    assert interval2.end == end
+
+    interval3 = maya.MayaInterval.from_datetime(
+        end_dt=end.datetime(naive=False),
+        duration=duration,
+    )
+    assert interval3.start == start
+    assert interval3.end == end