Assignment Instructions

For this assignment you will be writing unit tests based on instructions below. In all cases, you should create a separate module $($script file$)$ which contains your unit test class.class that inherits from Python's TestCase class in the unittest module and create a set of unit

tests using black$-$box testing principles that ensures that identifies and appropriately tests all of

the different equivalence classes $($and permutations of those classes$)$ for the function described

above.

PasswordCheck.py

Below is python code for a function that will check supplied password to determine whether or

not it is a valid password. Valid passwords must be at least $10$ characters long and contain at

least one of each of the following types of characters: uppercase letter, lowercase letter,

contain any 'illegal' characters, which is any character which is not an uppercase$/$lowercase

letter, number, or special character. If a password is valid, the function returns the value True,

otherwise it raises an exception with a message explaining why the password is incorrect.

def password$\_$check$($password$)$:

if not isinstance $($password$,$ str$)$:

raise TypeError$("$password must be a string"$)$

if len$($password$)<mtext\; id="EditorElement\_4502163"></mtext><mn\; id="EditorElement\_4502164">1</mn><mn\; id="EditorElement\_4502165">0</mn>$ :

raise ValueError$("$password must be at least $10$ characters long"$)$

lower$\_$count, upper$\_$count, number$\_$count, special$\_$count $=0$

for char in password:

if char in "abcdefghijklmnopqrstuvwxyz":

lower$\_$count $+=1$

elif char in "ABCDEFGHIJKLMNOPQRSTUVWXYZ":

upper$\_$count $+=1$

elif char in $"1234567890"$:

number$\_$count $+=1$

elif char in $"!!$#$\%$&& $()"$

special$\_$count $+=1$

else:

raise ValueError$("$password cannot contain illegal character: $",$ char$)$

if lower$\_$count $==0$ :

raise ValueError$("$password must contain at least $1$ lowercase character"$)$

if upper$\_$count $==0$ :

raise ValueError$("$password must contain at least $1$ uppercase character"$)$

if number$\_$count $==$ :

raise ValueError$("$password must contain at least $1$ number character"$)$

if special$\_$count $==0$ :

raise ValueError$("$password must contain at least $1$ special character"$)$

return True

Create a module with a PasswordCheckTest class that inherits from Python's TestCase class in

the unittest module and create a series of white box tests that will achieve branch coverage

$($i$.$e$.,$ between all of the unit tests, every branch in the password$\_$check function above will be

taken and not taken$)$ for the function.