def test_pow(self):
# power should error for offest units and for non-integer powers
x = _find_unit('m')
y = _find_unit('degF')
z = x**3
self.assertEqual(z, _find_unit('m**3'))
x = z**(1.0 / 3.0) # checks inverse integer units
self.assertEqual(x, _find_unit('m'))
# test offset units:
try:
y**17
except TypeError as err:
self.assertEqual(str(err),
'cannot exponentiate units with non-zero offset')
else:
self.fail('Expecting TypeError')
# test non-integer powers
try:
x**1.2
except TypeError as err:
self.assertEqual(
str(err), 'Only integer and inverse integer exponents allowed')
else:
self.fail('Expecting TypeError')
try:
x**(5.0 / 2.0)
except TypeError as err:
self.assertEqual(
str(err), 'Only integer and inverse integer exponents allowed')
else:
self.fail('Expecting TypeError')
def test_conversion_tuple_to(self):
# test_conversion_tuple_to shoudl error when units have different power
# lists
w = _find_unit('cm')
x = _find_unit('m')
y = _find_unit('degF')
z1 = _find_unit('degC')
# check for non offset units
self.assertEqual(w.conversion_tuple_to(x), (1 / 100.0, 0))
# check for offset units
result = y.conversion_tuple_to(z1)
self.assertAlmostEqual(result[0], 0.556, 3)
self.assertAlmostEqual(result[1], -32.0, 3)
# check for incompatible units
try:
x.conversion_tuple_to(z1)
except TypeError as err:
self.assertEqual(str(err),
"Units 'm' and 'degC' are incompatible.")
else:
self.fail("Expecting TypeError")
def test_multiply(self):
# multiplication should error for units with offsets
x = _find_unit('g')
y = _find_unit('s')
z = _find_unit('degC')
self.assertEqual(
x * y,
PhysicalUnit({
's': 1,
'kg': 1
}, .001, _get_powers(mass=1, time=1), 0))
self.assertEqual(
y * x,
PhysicalUnit({
's': 1,
'kg': 1
}, .001, _get_powers(mass=1, time=1), 0))
try:
x * z
except TypeError as err:
self.assertEqual(str(err),
"cannot multiply units with non-zero offset")
else:
self.fail("Expecting TypeError")
def test_division(self):
# division should error when working with offset units
w = _find_unit('kg')
x = _find_unit('g')
y = _find_unit('s')
z = _find_unit('degC')
quo = w / x
quo2 = x / y
self.assertEqual(quo, PhysicalUnit({'kg': 1, 'g': -1},
1000.0, _get_powers(), 0))
self.assertEqual(quo2, PhysicalUnit({'s': -1, 'g': 1},
0.001,
_get_powers(mass=1, time=-1), 0))
quo = y / 2.0
self.assertEqual(quo, PhysicalUnit({'s': 1, "2.0": -1},
.5, _get_powers(time=1), 0))
quo = 2.0 / y
self.assertEqual(quo, PhysicalUnit({'s': -1, "2.0": 1}, 2,
_get_powers(time=-1), 0))
try:
x / z
except TypeError as err:
self.assertEqual(
str(err), "Can't divide units: either 'g' or 'degC' has a non-zero offset.")
else:
self.fail("Expecting TypeError")
def test_pow(self):
# power should error for offest units and for non-integer powers
x = _find_unit('m')
y = _find_unit('degF')
z = x**3
self.assertEqual(z, _find_unit('m**3'))
x = z**(1.0 / 3.0) # checks inverse integer units
self.assertEqual(x, _find_unit('m'))
# test offset units:
try:
y**17
except TypeError as err:
self.assertEqual(
str(err), 'cannot exponentiate units with non-zero offset')
else:
self.fail('Expecting TypeError')
# test non-integer powers
try:
x**1.2
except TypeError as err:
self.assertEqual(
str(err), 'Only integer and inverse integer exponents allowed')
else:
self.fail('Expecting TypeError')
try:
x**(5.0 / 2.0)
except TypeError as err:
self.assertEqual(
str(err), 'Only integer and inverse integer exponents allowed')
else:
self.fail('Expecting TypeError')
def test_division(self):
# division should error when working with offset units
w = _find_unit('kg')
x = _find_unit('g')
y = _find_unit('s')
z = _find_unit('degC')
quo = w / x
quo2 = x / y
self.assertEqual(quo, PhysicalUnit({'kg': 1, 'g': -1},
1000.0, _get_powers(), 0))
self.assertEqual(quo2, PhysicalUnit({'s': -1, 'g': 1},
0.001,
_get_powers(mass=1, time=-1), 0))
quo = y / 2.0
self.assertEqual(quo, PhysicalUnit({'s': 1, "2.0": -1},
.5, _get_powers(time=1), 0))
quo = 2.0 / y
self.assertEqual(quo, PhysicalUnit({'s': -1, "2.0": 1}, 2,
_get_powers(time=-1), 0))
try:
x / z
except TypeError as err:
self.assertEqual(
str(err), "cannot divide units with non-zero offset")
else:
self.fail("Expecting TypeError")
def test_name(self):
# name should return a mathematically correct representation of the
# unit
x1 = _find_unit('m')
x2 = _find_unit('kg')
y = 1 / x1
self.assertEqual(y.name(), '1/m')
y = 1 / x1 / x1
self.assertEqual(y.name(), '1/m**2')
y = x1**2
self.assertEqual(y.name(), 'm**2')
y = x2 / (x1**2)
self.assertEqual(y.name(), 'kg/m**2')
def test_name(self):
# name should return a mathematically correct representation of the
# unit
x1 = _find_unit('m')
x2 = _find_unit('kg')
y = 1 / x1
self.assertEqual(y.name(), '1/m')
y = 1 / x1 / x1
self.assertEqual(y.name(), '1/m**2')
y = x1**2
self.assertEqual(y.name(), 'm**2')
y = x2 / (x1**2)
self.assertEqual(y.name(), 'kg/m**2')
def test_cmp(self):
# should error for incompatible units, if they are compatible then it
# should cmp on their factors
x = _find_unit('d')
y = _find_unit('s')
z = _find_unit('ft')
self.assertTrue(x > y)
self.assertEqual(x, x)
self.assertTrue(y < x)
try:
x < z
except TypeError as err:
self.assertEqual(str(err), "Incompatible units")
else:
self.fail("Expecting TypeError")
def test_cmp(self):
# should error for incompatible units, if they are compatible then it
# should cmp on their factors
x = _find_unit('d')
y = _find_unit('s')
z = _find_unit('ft')
self.assertTrue(x > y)
self.assertEqual(x, x)
self.assertTrue(y < x)
try:
x < z
except TypeError as err:
self.assertEqual(str(err), "Incompatible units")
else:
self.fail("Expecting TypeError")
def test_repr_str(self):
# __repr__should return a string which could be used to contruct the
# unit instance, __str__ should return a string with just the unit
# name for str
u = _find_unit('d')
self.assertEqual(repr(u),
"PhysicalUnit({'d': 1},86400.0,%s,0.0)" % _get_powers(time=1))
self.assertEqual(str(u), "<PhysicalUnit d>")
def test_repr_str(self):
# __repr__should return a string which could be used to contruct the
# unit instance, __str__ should return a string with just the unit
# name for str
u = _find_unit('d')
self.assertEqual(repr(u),
"PhysicalUnit({'d': 1},86400.0,%s,0.0)" % _get_powers(time=1))
self.assertEqual(str(u), "<PhysicalUnit d>")
def test_multiply(self):
# multiplication should error for units with offsets
x = _find_unit('g')
y = _find_unit('s')
z = _find_unit('degC')
self.assertEqual(x * y, PhysicalUnit({'s': 1, 'kg': 1}, .001,
_get_powers(mass=1, time=1), 0))
self.assertEqual(y * x, PhysicalUnit({'s': 1, 'kg': 1}, .001,
_get_powers(mass=1, time=1), 0))
try:
x * z
except TypeError as err:
self.assertEqual(
str(err), "cannot multiply units with non-zero offset")
else:
self.fail("Expecting TypeError")
def test_conversion_tuple_to(self):
# test_conversion_tuple_to shoudl error when units have different power
# lists
w = _find_unit('cm')
x = _find_unit('m')
y = _find_unit('degF')
z1 = _find_unit('degC')
# check for non offset units
self.assertEqual(w.conversion_tuple_to(x), (1 / 100.0, 0))
# check for offset units
result = y.conversion_tuple_to(z1)
self.assertAlmostEqual(result[0], 0.556, 3)
self.assertAlmostEqual(result[1], -32.0, 3)
# check for incompatible units
try:
x.conversion_tuple_to(z1)
except TypeError as err:
self.assertEqual(str(err), "Incompatible units")
else:
self.fail("Expecting TypeError")