import unittest
import io
import re
from unittest import mock
import math
import student_X as main #Replace student_X with your filename 
import sys
import io
from io import StringIO
    
    
    
 

class PrintInterestingMultiplesTests(unittest.TestCase):

    def test_default_case(self):
        function = main.print_interesting_multiples

        try:
            docstring = function.__doc__
            docstring = docstring.strip()
        except:
            docstring = ""
        correct = docstring != ""
        message = "docstring is blank."
        self.assertTrue(correct, message) 

        

        with mock.patch('sys.stdout', new=io.StringIO()) as fake_stdout:
            function(17, 0)
        output = fake_stdout.getvalue().strip()

        correct = "" == output
        feedback = "Doesn't print out nothing when the second parameter is zero."
        self.assertTrue(correct, feedback)

        regex = ''
        correct = re.match(regex, output)
        feedback = "Doesn't print out nothing when the second parameter is zero."
        self.assertTrue(correct, feedback)


        
        with mock.patch('sys.stdout', new=io.StringIO()) as fake_stdout:
            function(17, 1)
        output = fake_stdout.getvalue().strip()

        correct = "17" == output
        feedback = "Doesn't just print out the first parameter when the second parameter is 1."
        self.assertTrue(correct, feedback)

        regex = '17'
        correct = re.match(regex, output)
        feedback = "Doesn't just print out the first parameter when the second parameter is 1."
        self.assertTrue(correct, feedback)


        with mock.patch('sys.stdout', new=io.StringIO()) as fake_stdout:
            function(5, 2)
        output = fake_stdout.getvalue().strip()

        correct = output == "5 10"
        feedback = "Doesn't just print '5 10' when the parameters are (5,2)."
        self.assertTrue(correct, feedback)

        regex = '5 10'
        correct = re.match(regex, output)
        feedback = "Doesn't just print '5 10' when the parameters are (5,2)."
        self.assertTrue(correct, feedback)


        with mock.patch('sys.stdout', new=io.StringIO()) as fake_stdout:
            function(12, 4)
        output = fake_stdout.getvalue().strip()

        correct = output == "12 24 36 48"
        feedback = "Doesn't work on the parameters (12,4)."
        self.assertTrue(correct, feedback)
        
        
if __name__ == "__main__":
    tests = PrintInterestingMultiplesTests()
    tests.test_default_case()