Mapytex/test/test_expression.py

69 lines
1.8 KiB
Python

#!/usr/bin/env python
# encoding: utf-8
import unittest
from pymath.expression import Expression
from pymath.fraction import Fraction
from pymath.generic import first_elem
from pymath.render import txt, tex
class TestExpression(unittest.TestCase):
"""Testing functions from pymath.expression"""
def setup(self):
Expression.set_render(txt)
def test_init_from_str(self):
exp = Expression("2 + 3")
self.assertEqual(exp.postfix_tokens, [2, 3, "+"])
def test_init_from_exp(self):
pass
def test_list(self):
exp = Expression([2, 3, "+"])
self.assertEqual(exp.postfix_tokens, [2, 3, "+"])
def test_simplify_frac(self):
render = lambda _,x : str(x)
Expression.set_render(render)
exp = Expression("1/2 - 4")
steps = ["[1, 2, '/', 4, '-']", \
"[< Fraction 1 / 2>, 4, '-']", \
"[1, 1, '*', 2, 1, '*', '/', 4, 2, '*', 1, 2, '*', '/', '-']", \
"[1, 8, '-', 2, '/']", \
'[< Fraction -7 / 2>]']
self.assertEqual(steps, list(exp.simplify()))
Expression.set_render(txt)
def test_add_exp(self):
e = Expression("12- 4")
f = Expression("4 + 1")
g = e + f
self.assertEqual(g.postfix_tokens, [12, 4, '-', 4, 1, "+", "+"])
def test_mul_exp(self):
e = Expression("12- 4")
f = Expression("4 + 1")
g = e * f
self.assertEqual(g.postfix_tokens, [12, 4, '-', 4, 1, "+", "*"])
def test_neg_exp(self):
e = Expression("12- 4")
g = -e
self.assertEqual(g.postfix_tokens, [12, 4, '-', '-'])
if __name__ == '__main__':
unittest.main()
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