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))
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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))
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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))
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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)
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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)
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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)
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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)
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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))
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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'
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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'
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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)