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# -*- coding: utf-8 -*-
from __future__ import division, unicode_literals, print_function, absolute_import
import itertools
from pint import pi_theorem
from pint.testsuite import TestCase
class TestPiTheorem(TestCase):
FORCE_NDARRAY = False
def test_simple(self):
# simple movement
self.assertEqual(pi_theorem({'V': 'm/s', 'T': 's', 'L': 'm'}),
[{'V': 1, 'T': 1, 'L': -1}])
# pendulum
self.assertEqual(pi_theorem({'T': 's', 'M': 'grams', 'L': 'm', 'g': 'm/s**2'}),
[{'g': 1, 'T': 2, 'L': -1}])
def test_inputs(self):
V = 'km/hour'
T = 'ms'
L = 'cm'
f1 = lambda x: x
f2 = lambda x: self.Q_(1, x)
f3 = lambda x: self.Q_(1, x).units
f4 = lambda x: self.Q_(1, x).dimensionality
fs = f1, f2, f3, f4
for fv, ft, fl in itertools.product(fs, fs, fs):
qv = fv(V)
qt = ft(T)
ql = ft(L)
self.assertEqual(self.ureg.pi_theorem({'V': qv, 'T': qt, 'L': ql}),
[{'V': 1.0, 'T': 1.0, 'L': -1.0}])
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