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energytests.py
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energytests.py
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# -*- coding: utf-8 -*-
from __future__ import with_statement
from calendar import timegm
from contextlib import contextmanager
from datetime import datetime, timedelta
from functools import partial
from time import gmtime
from pytest import raises
from energy import Energy, timestamp
@contextmanager
def time_traveler():
import energy
changed_time = [0]
def T(time=None):
if time is None:
return changed_time[0]
else:
changed_time[0] = time
original_timestamp = energy.timestamp
energy.timestamp = partial(energy.timestamp, default_time_getter=T)
yield T
energy.timestamp = original_timestamp
def test_timestamp():
_1sec = timedelta(0, 1)
assert datetime.utcfromtimestamp(timestamp()) - datetime.utcnow() < _1sec
assert datetime.fromtimestamp(timestamp()) - datetime.now() < _1sec
assert timestamp() - timegm(gmtime()) < 1
def test_init_energy():
energy = Energy(10, 10)
assert isinstance(energy.recovery_interval, int)
assert energy.recovery_interval == 10
energy = Energy(10, timedelta(seconds=10))
assert isinstance(energy.recovery_interval, (int, float))
assert energy.recovery_interval == 10
def test_use_energy():
energy = Energy(10, 1000)
assert energy == 10
energy.use()
assert energy == 9
energy.use(5)
assert energy == 4
with raises(ValueError):
energy.use(5)
energy.use(10, timestamp() + 10000)
assert energy.current(timestamp() + 10000) == 0
with raises(ValueError):
energy.use(10, timestamp() + 10010)
energy.use(10, timestamp() + 10010, force=True)
assert energy.recover_in(timestamp() + 10010) == 11000
assert energy.current(timestamp() + 10010) == 0
assert energy.debt(timestamp() + 10010) == 10
energy.use(10, timestamp() + 10010, force=True)
assert energy.recover_in(timestamp() + 10010) == 21000
assert energy.debt(timestamp() + 10010) == 20
def test_set_energy():
energy = Energy(10, 1000)
energy.set(1)
assert energy == 1
energy.set(5)
assert energy == 5
def test_reset_energy():
energy = Energy(10, 1000)
energy.use(5)
assert energy == 5
energy.reset()
assert energy == 10
def test_cast_energy():
true_energy = Energy(1, 1000)
false_energy = Energy(0, 1000)
assert int(true_energy) == 1
assert int(false_energy) == 0
assert float(true_energy) == 1.0
assert float(false_energy) == 0.0
assert bool(true_energy) is True
assert bool(false_energy) is False
def test_recover_energy():
energy = Energy(10, 5)
with time_traveler() as T:
T(0)
energy.use(2)
T(1)
assert energy == 8
assert energy.recover_in() == 4
assert energy.recover_fully_in() == 9
T(2)
assert energy == 8
assert energy.recover_in() == 3
assert energy.recover_fully_in() == 8
T(3)
assert energy == 8
assert energy.recover_in() == 2
assert energy.recover_fully_in() == 7
T(4)
assert energy == 8
assert energy.recover_in() == 1
assert energy.recover_fully_in() == 6
T(5)
assert energy == 9
assert energy.recover_in() == 5
assert energy.recover_fully_in() == 5
T(9)
assert energy == 9
assert energy.recover_in() == 1
assert energy.recover_fully_in() == 1
T(10)
assert energy == 10
assert energy.recover_in() == None
assert energy.recover_fully_in() == None
T(100)
assert energy == 10
assert energy.recover_in() == None
assert energy.recover_fully_in() == None
def test_use_energy_while_recovering():
energy = Energy(10, 5)
with time_traveler() as T:
T( 0); energy.use(5)
T( 1); assert energy == 5
T( 2); energy.use(1)
T( 3); assert energy == 4
T( 4); assert energy == 4
T( 5); assert energy == 5
T( 6); assert energy == 5
T( 7); energy.use(1)
T( 8); assert energy == 4
T( 9); assert energy == 4
T(10); assert energy == 5
def test_use_energy_after_recovered():
energy = Energy(10, 5)
with time_traveler() as T:
T( 0); energy.use(10)
T( 1); assert energy == 0
T( 5); energy.use(1)
T( 6); assert energy == 0
def test_use_energy_at_the_future():
energy = Energy(10, 5)
with time_traveler() as T:
T( 5); energy.use()
T( 6); assert energy.passed() == 1
with raises(ValueError):
T( 4); energy.passed()
with raises(ValueError):
T( 3); energy.passed()
with raises(ValueError):
T( 2); energy.passed()
with raises(ValueError):
T( 1); energy.passed()
with raises(ValueError):
T( 0); energy.passed()
def test_future_tulerance():
energy = Energy(10, 5, future_tolerance=4)
with time_traveler() as T:
T(5)
energy.use()
# used at the past
T(6)
assert energy.passed() == 1
assert energy == 9
# used at the near future
T(4)
assert energy.passed() == 0
assert energy == 9
T(3)
assert energy.passed() == 0
assert energy == 9
T(2)
assert energy.passed() == 0
assert energy == 9
T(1)
assert energy.passed() == 0
assert energy == 9
# used at the remote future
T(0)
with raises(ValueError):
energy.passed()
def test_pickle_energy():
try:
import cPickle as pickle
except ImportError:
import pickle
energy = Energy(10, 5)
with time_traveler() as T:
T( 0); assert energy == 10
T( 1); energy.use(5)
T( 2); assert energy == 5
dump = pickle.dumps(energy)
loaded_energy = pickle.loads(dump)
assert energy == loaded_energy
T( 3); assert energy == 5
T( 3); assert loaded_energy == 5
class OldEnergy(Energy):
def __setstate__(self):
return (self.max, self.recovery_interval, self.recovery_quantity,
self.used, self.used_at)
def test_pickle_energy_compatibility():
try:
import cPickle as pickle
except ImportError:
import pickle
energy = OldEnergy(10, 5)
with time_traveler() as T:
T( 0); assert energy == 10
T( 1); energy.use(5)
T( 2); assert energy == 5
dump = pickle.dumps(energy)
dump = dump.replace('energytests\nOldEnergy'.encode(),
'energy\nEnergy'.encode())
loaded_energy = pickle.loads(dump)
assert type(loaded_energy) is Energy
T( 3); assert energy == 5
T( 3); assert loaded_energy == 5
def test_save_and_retrieve_energy():
energy = Energy(10, 5)
with time_traveler() as T:
T( 0); assert energy == 10
T( 1); energy.use(5)
T( 2); assert energy == 5
T(3)
saved = energy.used
saved_used, saved_used_at = energy.used, energy.used_at
T(11)
assert energy == 7
loaded_energy = Energy(10, 5, used=saved_used, used_at=saved_used_at)
assert loaded_energy == 7
assert loaded_energy == energy
loaded_energy2 = Energy(10, 5)
loaded_energy2.used = saved_used
loaded_energy2.used_at = saved_used_at
assert loaded_energy2 == 7
assert loaded_energy2 == energy
loaded_energy3 = object.__new__(Energy)
loaded_energy3.__init__(10, 5, used=saved_used, used_at=saved_used_at)
assert loaded_energy3 == 7
assert loaded_energy3 == energy
loaded_energy4 = object.__new__(Energy)
loaded_energy4.used = saved_used
loaded_energy4.used_at = saved_used_at
loaded_energy4.__init__(10, 5, used=saved_used, used_at=saved_used_at)
assert loaded_energy4 == 7
assert loaded_energy4 == energy
def test_float_recovery_interval():
energy = Energy(10, 0.5)
with time_traveler() as T:
T( 0); energy == 10
T( 1); energy.use(3)
T( 2); energy == 9
T( 3); energy == 10
def test_equivalent_energy():
assert Energy(10, 10) == Energy(10, 10)
assert Energy(5, 10) != Energy(10, 10)
e1, e2, e3 = Energy(10, 10), Energy(10, 10), Energy(8, 10)
with time_traveler() as T:
T(123)
e1.use()
e2.use()
assert e1 == e2
T(128)
e1.use()
assert e1 != e2
assert int(e1) == int(e3)
assert e1 != e3
def test_set_max_energy():
energy = Energy(10, 300)
with time_traveler() as T:
T( 0); assert energy == 10
T( 1); energy.max = 11
T( 2); assert energy == 11
T( 3); energy.use()
T( 4); assert energy == 10
T( 5); energy.max = 12
T( 6); assert energy == 10
T( 7); energy.max = 9
T( 8); assert energy == 9
T( 9); energy.max = 1
T(10); assert energy == 1
T(11); energy.max = 10
T(12); assert energy == 10
def test_extra_energy():
energy = Energy(10, 300)
with time_traveler() as T:
T(0)
energy.set(15)
T(1)
assert energy == 15
assert energy.recover_in() is None
assert energy.recover_fully_in() is None
T(2)
energy.use()
assert energy.recover_in() is None
assert energy.recover_fully_in() is None
T(6)
energy.use(6)
T(7)
assert energy.recover_in() == 299
assert energy.recover_fully_in() == 599
T(8)
assert energy.recover_in() == 298
assert energy.recover_fully_in() == 598
T(9)
energy.set(15)
assert energy.recover_in() is None
assert energy.recover_fully_in() is None
T(10)
assert energy.recover_in() is None
assert energy.recover_fully_in() is None
def test_restored_extra_energy():
energy = Energy(10, 300, used=-5, used_at=0)
assert energy.used_at is None
with time_traveler() as T:
T(0)
assert energy == 15
energy.use()
assert energy == 14
assert energy.used_at is None
def test_repr_energy():
energy = Energy(10, 300)
with time_traveler() as T:
T( 0); assert repr(energy) == '<Energy 10/10>'
T( 1); energy.use()
T( 2); assert repr(energy) == '<Energy 9/10 recover in 04:59>'
def test_compare_energy():
energy = Energy(10, 300)
with time_traveler() as T:
T(0)
assert energy == 10
assert energy > 9
assert 9 < energy
assert energy < 11
assert 11 > energy
assert 9 < energy < 11
assert energy <= 10
assert energy >= 10
assert 10 <= energy
assert 10 >= energy
assert 10 <= energy <= 10
def test_arithmetic_assign_energy():
energy = Energy(10, 3)
with time_traveler() as T:
T( 0); energy += 10
T( 1); assert energy == 20
T( 2); energy -= 13
T( 3); assert energy == 7
T( 6); assert energy == 8
T( 7); energy += 10
T( 8); energy -= 10;
T( 9); assert energy.recover_in() == 2
T(10); assert energy.recover_in() == 1
T(11); assert energy == 9
def test_various_used_at():
with time_traveler() as T:
T(2)
energy = Energy(10, 3, used=1, used_at=1)
assert energy == 9
T(5)
assert energy == 10
T(2)
energy = Energy(10, 3, used=1, used_at=datetime.utcfromtimestamp(1))
assert energy == 9
T(5)
assert energy == 10
def test_recovery_quantity():
with time_traveler() as T:
T(0)
energy = Energy(10, 3, 2)
assert energy == 10
energy.use()
energy.use()
energy.use()
assert energy == 7
T(1)
assert energy == 7
T(2)
assert energy == 7
T(3)
assert energy == 9
T(6)
assert energy == 10