def test_to_float(self):
"""Return floats for any given integer, decimal, or fraction."""
assert isinstance(Quantity.to_float(3.145), float)
assert isinstance(Quantity.to_float(Decimal('2.544')), float)
assert isinstance(Quantity.to_float('5.456'), float)
assert isinstance(Quantity.to_float(132), float)
assert isinstance(Quantity.to_float(Fraction(3, 4)), float)
def test_from_queryable_values(self, db):
"""Return a Quantity with the given value and units."""
qty1 = Quantity(value='1/4', units='gram')
qty2 = Quantity(value=0.25, units='gram')
db.session.add_all([qty1, qty2])
assert Quantity.from_queryable_values(value='1/4',
units='gram') is qty1
assert Quantity.from_queryable_values(value=0.25,
units='gram') is qty2
def test_dec_check(self):
"""Dec check returns True if value looks like a decimal number."""
assert Quantity.dec_check(3.145)
assert Quantity.dec_check(Decimal('1.75'))
assert Quantity.dec_check('4.55')
assert not Quantity.dec_check(Fraction(3, 4))
assert not Quantity.dec_check('$3.50')
assert not Quantity.dec_check(33)
assert not Quantity.dec_check([4.3, 35.34])
def test_value_getter(self):
"""Return value in appropriate format."""
qty = Quantity()
qty.value = '3.1415'
assert qty.value == 3.1415
qty.value = Decimal('5.21')
assert qty.value == 5.21
qty.value = 100
assert qty.value == 100
qty.value = '100'
assert qty.value == 100
qty.value = '4/3'
assert qty.value == Fraction(4, 3)
qty.value = Fraction(1, 2)
assert qty.value == Fraction(1, 2)
qty.value = None
assert qty.value is None
def test_value_setter(self):
"""Set value appropriately given valid data."""
qty = Quantity()
qty.value = 100
assert qty._numerator == 100
assert qty._denominator == 1
assert not qty.is_decimal
assert qty._float == 100.0
qty.value = 100
assert qty._numerator == 100
assert qty._denominator == 1
assert not qty.is_decimal
assert qty._float == 100.0
qty.value = 3.1415
assert qty.is_decimal
assert qty._numerator is None
assert qty._denominator is None
assert qty._float == 3.1415
qty.value = '3.1415'
assert qty.is_decimal
assert qty._numerator is None
assert qty._denominator is None
assert qty._float == 3.1415
qty.value = Decimal('3.1415')
assert qty.is_decimal
assert qty._numerator is None
assert qty._denominator is None
assert qty._float == 3.1415
qty.value = Fraction(1, 2)
assert not qty.is_decimal
assert qty._numerator == 1
assert qty._denominator == 2
assert qty._float == 0.5
qty.value = Fraction(5, 2)
assert not qty.is_decimal
assert qty._numerator == 5
assert qty._denominator == 2
assert qty._float == 2.5
qty.value = '3/4'
assert not qty.is_decimal
assert qty._numerator == 3
assert qty._denominator == 4
assert qty._float == 0.75
qty.value = '1 1/4'
assert not qty.is_decimal
assert qty._numerator == 5
assert qty._denominator == 4
assert qty._float == 1.25
qty.value = None
assert qty.is_decimal is None
assert qty._numerator is None
assert qty._denominator is None
assert qty._float is None
def test_html_value(self):
"""Return HTML entities or special HTML for fractions.
Return a string of self.value if it is not a fraction.
"""
qty = Quantity()
qty.value = Fraction(1, 4)
assert qty.html_value == '¼'
qty.value = Fraction(1, 2)
assert qty.html_value == '½'
qty.value = Fraction(3, 4)
assert qty.html_value == '¾'
qty.value = Fraction(1, 3)
assert qty.html_value == '⅓'
qty.value = Fraction(2, 3)
assert qty.html_value == '⅔'
qty.value = Fraction(1, 5)
assert qty.html_value == '⅕'
qty.value = Fraction(2, 5)
assert qty.html_value == '⅖'
qty.value = Fraction(3, 5)
assert qty.html_value == '⅗'
qty.value = Fraction(4, 5)
assert qty.html_value == '⅘'
qty.value = Fraction(1, 6)
assert qty.html_value == '⅙'
qty.value = Fraction(5, 6)
assert qty.html_value == '⅚'
qty.value = Fraction(1, 8)
assert qty.html_value == '⅛'
qty.value = Fraction(3, 8)
assert qty.html_value == '⅜'
qty.value = Fraction(5, 8)
assert qty.html_value == '⅝'
qty.value = Fraction(7, 8)
assert qty.html_value == '⅞'
qty.value = Fraction(9, 11)
assert qty.html_value == '<span class="fraction"><sup>9</sup>⁄'\
'<sub>11</sub></span>'
qty.value = Decimal('3.1415')
assert qty.html_value == '3.1415'
qty.value = 100
assert qty.html_value == '100'
qty.value = '100'
assert qty.html_value == '100'
def test_str_to_fraction(self):
"""Return a Fraction given a valid string containing a fraction.
If val is not parseable, raise ValueError.
"""
assert Quantity.str_to_fraction('3/4') == Fraction(3, 4)
assert Quantity.str_to_fraction('1 1/2') == Fraction(3, 2)
assert Quantity.str_to_fraction('3 4/11') == Fraction(37, 11)
assert Quantity.str_to_fraction('13/3') == Fraction(13, 3)
with pytest.raises(ValueError):
Quantity.str_to_fraction('3/4/3')
with pytest.raises(ValueError):
Quantity.str_to_fraction('3 4 3/4')
with pytest.raises(ValueError):
Quantity.str_to_fraction('$2.5')
with pytest.raises(ValueError):
Quantity.str_to_fraction('$2 3/4')
def test_fraction_to_str(self):
"""Return fractions in a human-friendly string format.
Raise TypeError if not given a Fraction.
"""
assert Quantity.fraction_to_str(Fraction(3, 4)) == '3/4'
assert Quantity.fraction_to_str(Fraction(13, 3)) == '4 1/3'
assert Quantity.fraction_to_str(Fraction(235, 22)) == '10 15/22'
with pytest.raises(TypeError):
Quantity.fraction_to_str(3.1415)
with pytest.raises(TypeError):
Quantity.fraction_to_str(Decimal('3.253'))
with pytest.raises(TypeError):
Quantity.fraction_to_str(2432)
with pytest.raises(TypeError):
Quantity.fraction_to_str('4/3')
def test_repr(self):
"""Return a string representing a Quantity."""
qty = Quantity(100, 'seeds')
assert qty.__repr__() == '<Quantity "100 seeds">'