def test_good_named_add_w_mult():
"""A quantity with a named composed unit that carries a multiplier
should add to a composed unit that has a multiplier"""
mile = unit('mi').composed_unit
kilometre = unit('km')
assert within_epsilon(Quantity(1, mile) + Quantity(1, kilometre),
Quantity(1, kilometre) + Quantity(1, mile))
assert within_epsilon(Quantity(2609.344, unit('m')),
Quantity(1, kilometre) + Quantity(1, mile))
def test_good_named_add_w_mults():
"""Two quantities with compatible but differently-named and
differently-multiplied units should add together."""
mile = unit('mi')
kilometre = unit('km')
assert within_epsilon(Quantity(1, mile) + Quantity(1, kilometre),
Quantity(1, kilometre) + Quantity(1, mile))
assert within_epsilon(Quantity(2609.344, unit('m')),
Quantity(1, kilometre) + Quantity(1, mile))
def test_good_named_add_w_mult():
"""A quantity with a named composed unit that carries a multiplier
should add to a composed unit that has a multiplier"""
mile = unit('mi').composed_unit
kilometre = unit('km')
assert within_epsilon(
Quantity(1, mile) + Quantity(1, kilometre),
Quantity(1, kilometre) + Quantity(1, mile))
assert within_epsilon(Quantity(2609.344, unit('m')),
Quantity(1, kilometre) + Quantity(1, mile))
def test_good_named_add_w_mults():
"""Two quantities with compatible but differently-named and
differently-multiplied units should add together."""
mile = unit('mi')
kilometre = unit('km')
assert within_epsilon(
Quantity(1, mile) + Quantity(1, kilometre),
Quantity(1, kilometre) + Quantity(1, mile))
assert within_epsilon(Quantity(2609.344, unit('m')),
Quantity(1, kilometre) + Quantity(1, mile))
def test_good_sub_w_mults():
"""Two quantities with compatible units should sub together
even when they have different multipliers"""
mile = unit('mi').composed_unit
kilometre = unit('km').composed_unit
m_on_left = Quantity(1, mile) - Quantity(1, kilometre)
km_on_left = Quantity(1, kilometre) - Quantity(1, mile)
m_on_left_diff = Quantity(609.344, unit('m'))
km_on_left_diff = Quantity(-609.344, unit('m'))
assert within_epsilon(m_on_left, m_on_left_diff)
assert within_epsilon(km_on_left, km_on_left_diff)
assert within_epsilon(m_on_left_diff, -km_on_left_diff)
def test_pow():
"""Exponentiation of quantities."""
REGISTRY.clear()
define_units()
m_unit = unit('m')
m_quant = Quantity(2, m_unit)
assert (m_quant ** 2 == m_quant * m_quant == pow(m_quant, 2))
cm_unit = unit('cm')
cm_quant = Quantity(2, cm_unit)
assert within_epsilon(cm_quant ** 2, cm_quant * cm_quant)
assert within_epsilon(cm_quant ** 2, pow(cm_quant, 2))
def test_good_sub_w_mults():
"""Two quantities with compatible units should sub together
even when they have different multipliers"""
mile = unit('mi').composed_unit
kilometre = unit('km').composed_unit
m_on_left = Quantity(1, mile) - Quantity(1, kilometre)
km_on_left = Quantity(1, kilometre) - Quantity(1, mile)
m_on_left_diff = Quantity(609.344, unit('m'))
km_on_left_diff = Quantity(-609.344, unit('m'))
assert within_epsilon(m_on_left, m_on_left_diff)
assert within_epsilon(km_on_left, km_on_left_diff)
assert within_epsilon(m_on_left_diff, -km_on_left_diff)
def test_named_pickle():
"""Pickling is reversible on quantities backed by named units"""
named = named_unit('S', 'N', 'D')
arbitrary_quantity = named(3.0)
pickled = dumps(arbitrary_quantity)
unpickled = loads(pickled)
assert within_epsilon(arbitrary_quantity, unpickled)
def test_composed_pickle():
"""Pickling is reversible on quantities backed by composed units"""
arbitrary = unit('arbitrary')
arbitrary_quantity = arbitrary(3.0) * arbitrary(3.0)
pickled = dumps(arbitrary_quantity)
unpickled = loads(pickled)
assert within_epsilon(arbitrary_quantity, unpickled)
def test_pow():
"""Exponentiation of quantities."""
REGISTRY.clear()
define_units()
m_unit = unit('m')
m_quant = Quantity(2, m_unit)
assert (m_quant ** 2 ==
m_quant * m_quant ==
pow(m_quant, 2))
cm_unit = unit('cm')
cm_quant = Quantity(2, cm_unit)
assert within_epsilon(cm_quant ** 2, cm_quant * cm_quant)
assert within_epsilon(cm_quant ** 2, pow(cm_quant, 2))
def test_valid_composed_to_composed():
"""Valid composed units in terms of others."""
metric_vel = unit('km') / unit('h')
imp_vel = unit('mi') / unit('h')
highway_kph = Quantity(100, metric_vel)
highway_mph = Quantity(62.1371192237334, imp_vel)
assert str(highway_kph) == '100 km / h'
assert str(highway_mph) == '62.1371192237 mi / h'
assert within_epsilon(imp_vel(highway_kph), highway_mph)
assert str(imp_vel(highway_kph)) == '62.1371192237 mi / h'
def test_valid_composed_to_composed():
"""Valid composed units in terms of others."""
metric_vel = unit('km') / unit('h')
imp_vel = unit('mi') / unit('h')
highway_kph = Quantity(100, metric_vel)
highway_mph = Quantity(62.1371192237334, imp_vel)
assert str(highway_kph) == '100.00 km / h'
assert str(highway_mph) == '62.14 mi / h'
assert within_epsilon(imp_vel(highway_kph), highway_mph)
assert str(imp_vel(highway_kph)) == '62.14 mi / h'
def test_good_add_w_mults():
"""Two quantities with compatible units should add together
even when they have different multipliers"""
mile = ComposedUnit([unit('m')], [], multiplier=1609.344)
kilometre = ComposedUnit([unit('m')], [], multiplier=1000)
m_on_left = Quantity(1, mile) + Quantity(1, kilometre)
km_on_left = Quantity(1, kilometre) + Quantity(1, mile)
manual_sum = Quantity(2609.344, unit('m'))
assert within_epsilon(m_on_left, km_on_left)
assert within_epsilon(km_on_left, m_on_left)
assert within_epsilon(manual_sum, m_on_left)
assert within_epsilon(manual_sum, km_on_left)
assert within_epsilon(m_on_left, manual_sum)
assert within_epsilon(km_on_left, manual_sum)
def test_good_add_w_mults():
"""Two quantities with compatible units should add together
even when they have different multipliers"""
mile = ComposedUnit([unit('m')],
[],
multiplier=1609.344)
kilometre = ComposedUnit([unit('m')],
[],
multiplier=1000)
m_on_left = Quantity(1, mile) + Quantity(1, kilometre)
km_on_left = Quantity(1, kilometre) + Quantity(1, mile)
manual_sum = Quantity(2609.344, unit('m'))
assert within_epsilon(m_on_left, km_on_left)
assert within_epsilon(km_on_left, m_on_left)
assert within_epsilon(manual_sum, m_on_left)
assert within_epsilon(manual_sum, km_on_left)
assert within_epsilon(m_on_left, manual_sum)
assert within_epsilon(km_on_left, manual_sum)