Mapytex/test/test_expression.py

91 lines
2.4 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.renders import txt_render
class TestExpression(unittest.TestCase):
"""Testing functions from pymath.expression"""
def test_init_from_str(self):
exp = Expression("2 + 3")
self.assertEqual(exp.infix_tokens, [2, "+", 3])
self.assertEqual(exp.postfix_tokens, [2, 3, "+"])
def test_init_from_exp(self):
pass
def test_infix_tokens(self):
pass
def test_postfix_tokens(self):
pass
def test_str2tokens_big_num(self):
exp = "123 + 3"
tok = Expression.str2tokens(exp)
self.assertEqual(tok, [123, "+", 3])
def test_str2tokens_beg_minus(self):
exp = "-123 + 3"
tok = Expression.str2tokens(exp)
self.assertEqual(tok, [-123, "+", 3])
def test_str2tokens_time_lack(self):
exp = "(-3)(2)"
tok = Expression.str2tokens(exp)
self.assertEqual(tok, ["(", -3, ")", "*","(", 2, ")" ])
def test_str2tokens_time_lack2(self):
exp = "-3(2)"
tok = Expression.str2tokens(exp)
self.assertEqual(tok, [-3, "*","(", 2, ")" ])
def test_str2tokens_error(self):
exp = "1 + $"
self.assertRaises(ValueError, Expression.str2tokens, exp)
def test_doMath(self):
ops = [\
{"op": ("+", 1 , 2), "res" : 3}, \
{"op": ("-", 1 , 2), "res" : -1}, \
{"op": ("*", 1 , 2), "res" : 2}, \
{"op": ("/", 1 , 2), "res" : Fraction(1,2)}, \
{"op": ("^", 1 , 2), "res" : 1}, \
]
for op in ops:
res = first_elem(Expression.doMath(*op["op"]))
self.assertAlmostEqual(res, op["res"])
def test_isNumber(self):
pass
def test_isOperator(self):
pass
def test_simplify_frac(self):
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()))
if __name__ == '__main__':
unittest.main()
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