import math
import unittest

from numint.input_parser import parse_function, parse_value


class InputParserTestCase(unittest.TestCase):
    def test_common_function(self):
        expr = "tan(radians(x))"
        fn = parse_function(expr)
        tan60 = fn(60)
        self.assertTrue(abs(tan60 - 1.732) < 0.01)  # add assertion here

    def test_eval_value(self):
        expr = "e"
        value = parse_value(expr)
        self.assertTrue(abs(value - math.e) < 0.0001)

if __name__ == '__main__':
    unittest.main()