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#(c) ben lipkowitz 11/16/08, distributed under the GPL version 2 or later
#unit unit test test, for skdb.py
import unittest
import skdb
from skdb import Unit
class TestUnits(unittest.TestCase):
def test_nounits(self):
self.assertEqual(skdb.Unit(None), skdb.Unit(0))
self.assertEqual(skdb.Unit(0), skdb.Unit(0))
self.assertEqual(skdb.Unit('-1'), skdb.Unit('0-1'))
self.assertEqual(skdb.Unit('1-1'), skdb.Unit(0))
self.assertTrue(skdb.Unit(0).compatible(skdb.Unit(1)))
self.assertTrue(skdb.Unit(1234).compatible(skdb.Unit(1)))
self.assertTrue(skdb.Unit(-1).compatible(skdb.Unit(1)))
def test_conversion(self):
self.assertEqual(skdb.Unit('25.4mm').to('in').string, '1.0*in')
self.assertRaises(skdb.UnitError, skdb.Unit('60 degrees').to, 'rad')
self.assertRaises(skdb.UnitError, skdb.Unit('60 degrees').to, 'fart')
def test_inf(self):
#self.assertEqual(str(skdb.Unit('1/0').simplify()), 'inf') #hmmmm
pass
def test_imaginary(self):
self.assertTrue(skdb.Unit('nanometer').check()) #actually i dont think we will ever see 'nano' in the result
self.assertRaises(skdb.NaNError, skdb.Unit,'sqrt(-1)')
self.assertRaises(skdb.NaNError, skdb.Unit,'sqrt(-1mm^2)')
self.assertRaises(skdb.NaNError, skdb.Unit,'(-1.5e2mm^3)^(1/3)')
self.assertRaises(skdb.NaNError, skdb.Unit(1).compatible, 'sqrt(-1)')
def test_weirdshit(self):
badunits = ['foobar',
'..', '...', '1...1',
'++', '--', '//', '**', '&', '#', '@', '!', '<', '>', ',', '=', '_',]
#'1.2.3', #i guess this is all right after all (1.2 * 0.3)
for i in badunits:
self.assertRaises(skdb.UnitError, skdb.Unit, i)
def test_order_of_operations(self):
self.assertEqual(skdb.Unit('25.4mm').to('inch'), skdb.Unit('in').to('25.4mm'))
self.assertEqual(skdb.Unit('2mm'), skdb.Unit('sqrt(4mm^2)'))
def test_check(self): #what am i testing here?
self.assertTrue(skdb.Unit(0).check())
self.assertTrue(skdb.Unit(None).check()) #do we really want None to pass?
self.assertTrue(skdb.Unit('mm').check())
self.assertTrue(skdb.Unit('in-25.4mm').check())
self.assertTrue(skdb.Unit('25.4mm').check())
#self.assertFalse(skdb.Unit('inch+second').check())
self.assertRaises(skdb.UnitError, skdb.Unit, 'inch+second')
def test_compatible(self):
self.assertTrue(skdb.Unit('25.4mm').compatible(skdb.Unit('in')))
self.assertFalse(skdb.Unit('inch').compatible(skdb.Unit('second')))
self.assertTrue(skdb.Unit('inch').compatible('inch'))
self.assertFalse(skdb.Unit('inch').compatible('blargh'))
def test_nonscalar(self):
self.assertEqual(skdb.Unit('tempF(212)'), skdb.Unit('tempC(100)'))
def test_add(self):
self.assertEqual(skdb.Unit('1') + skdb.Unit('1'), skdb.Unit('2'))
self.assertEqual(skdb.Unit('1m') + skdb.Unit('1yd'), skdb.Unit('1.9144m'))
def test_mul(self):
self.assertTrue((skdb.Unit('V') * skdb.Unit('A')).compatible('W'))
self.assertFalse((skdb.Unit('V') * skdb.Unit('W')).compatible('W'))
self.assertEqual(skdb.Unit('V') * skdb.Unit('A'), skdb.Unit('A') * skdb.Unit('V'))
def test_div(self):
self.assertEqual(1/skdb.Unit('16rev/in'), skdb.Unit('(1/16)*(in/rev)'))
self.assertEqual(1/skdb.Unit('16rev/in'), 1./skdb.Unit('16rev/in'))
def test_cmp(self):
self.assertTrue(skdb.Unit('1') >= skdb.Unit('1'))
self.assertTrue(skdb.Unit('1') <= skdb.Unit('1'))
self.assertTrue(skdb.Unit('1m') <= skdb.Unit('1000mm'))
self.assertTrue(skdb.Unit('1m') <= skdb.Unit('1000mm'))
self.assertFalse(skdb.Unit('1') < skdb.Unit('1'))
self.assertFalse(skdb.Unit('1') > skdb.Unit('1'))
self.assertTrue(skdb.Unit('1m') < skdb.Unit('1001mm'))
def test_negative_cmp(self): #this may not even make any sense in terms of real measurements, since they should never be negative
self.assertFalse(skdb.Unit('1') < skdb.Unit('-10'))
self.assertTrue(skdb.Unit('1') > skdb.Unit('-10'))
self.assertTrue(skdb.Unit('1') > skdb.Unit('0'))
self.assertTrue(skdb.Unit('0') > skdb.Unit('-1'))
self.assertTrue(skdb.Unit('1') > skdb.Unit('-1'))
self.assertTrue(skdb.Unit('1') < skdb.Unit('0'))
self.assertTrue(skdb.Unit('0') < skdb.Unit('-1'))
self.assertTrue(skdb.Unit('1') < skdb.Unit('-1'))
#now, to the left!
self.assertFalse(skdb.Unit('0') > skdb.Unit('1'))
self.assertFalse(skdb.Unit('-1') > skdb.Unit('0'))
self.assertFalse(skdb.Unit('-1') > skdb.Unit('1'))
self.assertFalse(skdb.Unit('0') < skdb.Unit('1'))
self.assertFalse(skdb.Unit('-1') < skdb.Unit('0'))
self.assertFalse(skdb.Unit('-1') < skdb.Unit('1'))
self.assertTrue(skdb.Unit('0') >= skdb.Unit('0'))
def test_supplemental_units(self):
self.assertTrue(skdb.Unit('man').check())
self.assertTrue(skdb.Unit('5*teeth').compatible('tooth'))
def test_somethingorother(self): #is this even desirable?
self.assertTrue(skdb.Unit('1') > 0.9)
class TestScrew(unittest.TestCase):
screw = skdb.Package("screw").Screw
#import skdb.packages.screw.screw as screw
#import skdb.packages.threads.threads as threads
def test_conversions(self):
screw_package = skdb.Package("screw")
screw1 = screw_package.parts[0]
#screw1 = skdb.load(skdb.package_file('screw', 'data.yaml'))['parts'][0]
self.assertEqual(screw1.thread.clamping_force('20N*m/rev'), '354.02982*lbf')
self.assertEqual(screw1.thread.clamping_force('100ft*lbf/rev'), '2400.0*lbf')
self.assertEqual(screw1.thread.tensile_area(), '0.031820683*in^2')
self.assertEqual(screw1.thread.minor_diameter(), '0.1850481*in')
self.assertEqual(screw1.thread.pitch_diameter(), '0.21752041*in')
self.assertEqual(screw1.max_force(), '2704.758*lbf')
self.assertEqual(screw1.breaking_force(), '3500.275*lbf')
class TestRange(unittest.TestCase):
def test_incompatibilities(self):
self.assertRaises(skdb.UnitError, skdb.Range("1m", "1kg"))
self.assertRaises(skdb.UnitError, skdb.Range("m", "kg"))
self.assertRaises(skdb.UnitError, skdb.Range("kg", "m"))
skdb.Range("1 mg", "g")
#test sympy integration
have_sympy = False
try:
import sympy.physics.units
have_sympy = True
except ImportError, error:
print "sympy.physics.units not tested (ImportError)"
if have_sympy:
class TestSympyUnits(unittest.TestCase):
def test_conversion(self):
m1 = skdb.Unit("m")
m2 = sympy.physics.units.m
self.assertTrue(m1.compatible(m2))
m3 = skdb.Unit(sympy.physics.units.m)
self.assertTrue(m1.compatible(m3))
self.assertTrue(m3.compatible(m1))
#test quantities integration
#http://packages.python.org/quantities/user/tutorial.html
have_quantities = False
try:
import quantities
have_quantities = True
except ImportError, error:
print "quantities not tested (ImportError)"
if have_quantities:
class TestQuantities(unittest.TestCase):
def test_compatibility(self):
m1 = skdb.Unit("m")
m2 = quantities.meter
m3 = quantities.Quantity([0], 'm')
m4 = quantities.Quantity([0], 'meter')
self.assertTrue(m1.compatible(m2))
self.assertTrue(m1.compatible(m3))
self.assertTrue(m1.compatible(m4))
def test_compound_quantities(self):
m1 = skdb.Unit("m**2/m**3")
m2 = quantities.CompoundUnit("m**2/m**3")
self.assertTrue(m1.compatible(m2))
def test_uncertain_quantities(self):
#doesn't look like uncertainties are mature in quantities
pass
have_sympycore = False
try:
import sympycore
have_sympycore = True
except ImportError, error:
print "sympycore not tested (ImportError)"
if have_sympycore:
class TestSympyCore(unittest.TestCase):
def test_compatibility(self):
m1 = skdb.Unit("m")
m2 = sympycore.physics.units.Unit("m")
self.assertTrue(m1.compatible(m2))
if __name__ == '__main__':
unittest.main()
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