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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 contextlib import contextmanager
from datetime import datetime, timedelta
from functools import partial
from inspect import getargspec
from attest import Tests, assert_hook, raises
from energy import Energy
suite = Tests()
@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
@suite.test
def 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
@suite.test
def 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)
@suite.test
def set_energy():
energy = Energy(10, 1000)
energy.set(1)
assert energy == 1
energy.set(5)
assert energy == 5
@suite.test
def reset_energy():
energy = Energy(10, 1000)
energy.use(5)
assert energy == 5
energy.reset()
assert energy == 10
@suite.test
def 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
@suite.test
def recover_energy():
energy = Energy(10, 5)
with time_traveler() as T:
T( 0); energy.use(1)
T( 1); assert energy == 9; assert energy.recover_in() == 4
T( 2); assert energy == 9; assert energy.recover_in() == 3
T( 3); assert energy == 9; assert energy.recover_in() == 2
T( 4); assert energy == 9; assert energy.recover_in() == 1
T( 5); assert energy == 10; assert energy.recover_in() == None
T( 6); assert energy == 10; assert energy.recover_in() == None
T(99); assert energy == 10; assert energy.recover_in() == None
@suite.test
def 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
@suite.test
def 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
@suite.test
def use_energy_in_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( 0); energy.passed()
@suite.test
def 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
@suite.test
def 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
saved = energy.used
saved_used, saved_used_at = energy.used, energy.used_at
loaded_energy = Energy(10, 5, used=saved_used, used_at=saved_used_at)
assert energy == loaded_energy
T( 3); assert energy == 5
@suite.test
def 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
@suite.test
def equivalent_energy():
assert Energy(10, 10) == Energy(10, 10)
assert Energy(5, 10) != Energy(10, 10)
e1, e2 = Energy(10, 10), Energy(10, 10)
e1.use(time=123)
e2.use(time=123)
assert e1 == e2
e1.use(time=128)
assert e1 != e2
@suite.test
def 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
@suite.test
def 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>'
@suite.test
def bonus_energy():
energy = Energy(10, 300)
with time_traveler() as T:
T( 0); energy.set(15)
T( 1); assert energy == 15
T( 2); energy.use()
T( 3); assert energy.recover_in() is None
T( 4); energy.use()
T( 5); assert energy.recover_in() is None
T( 6); energy.use(5)
T( 7); assert energy.recover_in() == 299
T( 8); assert energy.recover_in() == 298
T( 9); energy.set(15)
T(10); assert energy.recover_in() is None