Code in Python

Write the unit test script to perform your testing for both functions encrypt and decrypt using the unittest module and prove that they work properly. Remember to be as descriptive as possible and write as many cases as necessary

def encrypt(message, key):

"""

Takes a string and an integer an returns the encrypted message using the Caesar cipher method

>>> encrypt("Hello world",12)

'Tqxxa iadxp'

>>> encrypt("We are Penn State!!!",6)

'Ck gxk Vktt Yzgzk!!!'

>>> encrypt("We are Penn State!!!",5)

'Bj fwj Ujss Xyfyj!!!'

>>> encrypt(5.6,3)

'Invalid input'

>>> encrypt('Hello',3.5)

'Invalid input'

>>> encrypt(5.6,3.15)

'Invalid input'

"""

# --- YOU CODE STARTS HERE

if type(message) is not str or type(key) is not int:

return "Invalid Input"

encrypt_str = ""

for c in message:

if (65 ord(c) < 91)

if (ord(c) + key > 91):

c = chr(65 + ((ord(c) + key - 91) % 26))

else:

c = chr(ord(c) + key)

elif (97 ord(c) 122)

if (ord(c) + key > 122):

c = chr(97 + ((ord(c) + key -122) % 26) - 1)

else:

c= chr(ord(c) + key)

encrypt_str += c

return encrypt_str

# --- CODE ENDS HERE

def decrypt(message, key):

"""

Takes a string and an integer an returns the decrypted message using the Caesar cipher method

>>> decrypt("Tqxxa iadxp",12)

'Hello world'

>>> decrypt("Ck gxk Vktt Yzgzk!!!",6)

'We are Penn State!!!'

>>> decrypt("Bj fwj Ujss Xyfyj!!!",5)

'We are Penn State!!!'

>>> decrypt(5.6,3)

'Invalid input'

>>> decrypt('Hello',3.5)

'Invalid input'

>>> decrypt(5.6,3.15)

'Invalid input'

"""

# --- YOU CODE STARTS HERE

if type(message) is not str or type(key) is not int:

return "Invalid Input"

decrypt_str = ""

for c in message:

if (65 ord(c) 91)

if (ord(c) + key < 65):

c = chr(91 - ((ord('A') - (ord(c) - key)) % 26))

else:

c = chr(ord(c) + key)

elif (97 ord(c) 122)

if ord(c) - key < ord('a'):

c = chr(ord('z') - ((ord('a') - (ord(c) - key) % 26) + 1)

else:

c= chr(ord(c) - key)

decrypt_str += c

return decrypt_str

# --- CODE ENDS HERE