Add tests for Perfect_Number

[imSanko]

Describe your change:

Just added few more tests to define the code for efficiently.

• Add an algorithm?
• Fix a bug or typo in an existing algorithm?
• Add or change doctests? -- Note: Please avoid changing both code and tests in a single pull request.
• Documentation change?

Checklist:

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized.
• I know that pull requests will not be merged if they fail the automated tests.
• This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
• All new Python files are placed inside an existing directory.
• All filenames are in all lowercase characters with no spaces or dashes.
• All functions and variable names follow Python naming conventions.
• All function parameters and return values are annotated with Python type hints.
• All functions have doctests that pass the automated testing.
• All new algorithms include at least one URL that points to Wikipedia or another similar explanation.
• If this pull request resolves one or more open issues then the description above includes the issue number(s) with a closing keyword: "Fixes Improve our test coverage #9943".

[cclauss]

Cool!

[imSanko]

@cclauss everything is fixed now, idk there aren't any errors per my local computer for build.

[cclauss]

Did you do python3 -m doctest -v filepath.py?

I get:

043     >>> perfect(0)
Expected nothing
Got:
    True

[imSanko]

python3 -m doctest -v filepath.py

yes !

043 >>> perfect(0)
Expected nothing
Got:
True

Did you do python3 -m doctest -v filepath.py?

I get:

043     >>> perfect(0)
Expected nothing
Got:
    True

can you tell me how to resolve it?
Trying:
perfect(8128)
Expecting:
True
ok
1 items had no tests:
perfect_number
1 items passed all tests:
7 tests in perfect_number.perfect
7 tests in 2 items.
7 passed and 0 failed.
Test passed.

[imSanko]

@cclauss can you let me know what should be done? While, now it passes the tests as per I've added only the tests nothing else has been added, nor while the code been changed.

[cclauss]

Nice additions!