****PYTHON CODING UNIT TESTS: Implement each of the named test methods provided in the tests.py. Then think of and implement 2 more test methods that help define the behavior of Fraction's __init__ or __str__. ****

test.py :

from fraction import Fraction import unittest class TestInit(unittest.TestCase): #you should inspect the data members of self here, don't use __str__ #several of these will need to check to see if an exception is raised def test_divZero(self): with self.assertRaises(ZeroDivisionError,msg="Denominator of zero fails to raise DivByZero"): a = Fraction(1,0) def test_default(self): pass def test_oneArg(self): pass def test_twoArg(self): pass def test_threeArg(self): pass def test_invalidArg(self): pass def test_negDenom(self): pass def test_reduced(self): pass class TestStr(unittest.TestCase): def test_displayfraction(self): a = Fraction(1,2) self.assertEqual(" 1/2 ",a.__str__()) def test_displayInt(self): pass def test_displayNeg(self): pass

fraction.py:

class Fraction(object): """Reduced fraction class with integer numerator and denominator.""" def __init__(self, numerator=0, denominator=1): #precondition: if provided, numerator and denominator are integers, denominator is not 0 #postcondition: self.numerator and self.denominator are stored in reduced terms, with the gcd removed #if both arguments are negative, signs cancel and self.numerator, self.denominator will both be positive #if denominator is negative and numerator is positive, move the sign to self.numerator; self.denominator #should always be positive. pass def __str__(self): #precondition: self is valid #postcondition: return "/" unless the denominator is 1, then return # pass