User Class Represents a user in the social network. Contains a Profile instance representing the user's

details $($username$,$ password, screen name, email$).$ Manages user activities such as creating posts and

sending messages.

Attributes:

profile $($Profile$)$: User's profile.

posts $($list of Post$)$: List of posts created by the user.

messages $($list of Message$)$: List of messages sent by the user.

Methods:

$\_\_$init$\_\_($self$,$ username, password, screen$\_$name, email$)$: Initialize a User

instance.

create$\_$post$($self$,$ content$)->$ Post: Create a new post for the user. Raise

ValueError if the content of the post is empty.

send$\_$message$($self$,$ receiver, content$)->$ Message: Send a message to another

user. Raise ValueError if the receiver ID or message content is empty.

$\_\_$str$\_\_($self$)$: Return a string representation of the User.

Part $2$: hw$2\_$test.py $-$ Testing

Testing is a crucial part of software development to ensure that your classes and methods work as expected.

For this homework, you are required to thoroughly test all the classes and methods you implement. Utilize the

unittest framework to create test cases for each class and their respective methods. Pay close attention to

edge cases and ensure that your code handles them gracefully.

Example Testing

Here's a brief example of how you might structure your test cases:

$1.$ Profile Class Tests

Test the initialization of a Profile instance.

Modify the profile using the modify$\_$profile method and check if the changes are reflected.

$2.$ Activity Class Tests

Test the initialization of an Activity instance.

Check if the $\_\_$str$\_\_$ method returns the expected string.

$3.$ Post Class Tests

Test the creation of posts.

$4.$ Message Class Tests

Test the creation of messages.

$5.$ User Class Tests

Test the initialization of a User instance.

Test a post and a message with empty content.Expecting a ValueError to be raised.