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

class StartsWithTests(unittest.TestCase):

    def test_default_case(self):
        function = main.starts_with
        
        test = False
        try:
            incorrect = ""
            result = function.__doc__.strip()
            test = incorrect != result
        except:
            pass
        message = "No docstring."
        self.assertTrue(test, message)

        
        inputs = ('venusaur', '')
        correct = True
        if isinstance(inputs, tuple):
            result = function(*inputs)
        else:
            result = function(inputs)
        test = result == correct
        message = "Doesn't work when the second parameter is the empty string."
        self.assertTrue(test, message)

        
        inputs = ('venusaur', 'venusr')
        correct = False
        if isinstance(inputs, tuple):
            result = function(*inputs)
        else:
            result = function(inputs)
        test = result == correct
        message = "Doesn't return False when the first parameter doesn't start with the second."
        self.assertTrue(test, message)

        
        inputs = ('blastoise', 'blast')
        correct = True
        if isinstance(inputs, tuple):
            result = function(*inputs)
        else:
            result = function(inputs)
        test = result == correct
        message = "Doesn't work on 'blastoise' and 'blast'."
        self.assertTrue(test, message)

        
        inputs = ('blastoise', 'last')
        correct = False
        if isinstance(inputs, tuple):
            result = function(*inputs)
        else:
            result = function(inputs)
        test = result == correct
        message = "Doesn't work when the second string is a substring, but not a prefix."
        self.assertTrue(test, message)

        
        inputs = ('charmeleon', 'charmeleon')
        correct = True
        if isinstance(inputs, tuple):
            result = function(*inputs)
        else:
            result = function(inputs)
        test = result == correct
        message = "Doesn't work when the two strings are the same."
        self.assertTrue(test, message)

        
        inputs = ('charm', 'charmeleon')
        correct = False
        if isinstance(inputs, tuple):
            result = function(*inputs)
        else:
            result = function(inputs)
        test = result == correct
        message = "Doesn't work when the first string is a prefix of the second."
        self.assertTrue(test, message)
        
        
if __name__ == "__main__":
    tests = StartsWithTests()
    tests.test_default_case()