Improve test_problems.py

[vishal-ph]

Issue Description

• The file is too long and contains tests for all problem classes. We need to break it down as separate files testing each problem class for ease of maintainability.
• The tests contain some unused code and non consistent coding standards that need to be fixed.

Describe the solution you'd like:

• Break down the file src/openqaoa-core/tests/test_problems.py into different files containing relevant tests for each problem class defined in OpenQAOA
• OpenQAOA problem classes are defined in src/openqaoa-core/openqaoa_core/problems/.

Create a new folder in test_problems and create scripts consisting of specific tests corresponding to that problem class.
For e.g. create test_maximumcut.py and put all tests corresponding to maximum_cut.py in this file

NOTE: Please branch out of openqaoa/dev and make the PR to openqaoa/dev

[jiggychauhi]

Hey, this sound like something a newbie like me can do. Please assign me this issue.

[devilkiller-ag]

Hi, Can I work on this issue?

[vishal-ph]

Hello, thanks for your interest in contributing to OpenQAOA!
We encourage you to collaborate on this issue, otherwise, feel free to make an attempt individually and raise a PR to openqaoa/dev branch.

[devilkiller-ag]

Thank you @vishal-ph, Since it's a good first issue I will like to try it alone.

[devilkiller-ag]

Hi @vishal-ph, can you check and confirm if I am using correct naming conventions for test files or not?
Also the example 01_workflows_example.ipynb is using MaximumCut and NumberPartition both. Under which problem test file should I keep it in?

[devilkiller-ag]

@vishal-ph , I have moved all the tests into different files. Kindly heck my PR if it's ready for merge with dev branch or not.

[devilkiller-ag]

@vishal-ph any updates?

[vishal-ph]

@devilkiller-ag, I have added my comments on the PR itself

[Newtech66]

@vishal-ph The path is tests/test_problems.py right, not src/openqaoa-core/tests/test_problems.py?
So, we want it to be broken into tests/test_problems/test_*.py? (where * is a problem class)

[devilkiller-ag]

@vishal-ph the hyphen in folder name 'openqaoa-core' is causing an import problem. Python import statemens follows standard naming conventions, where module names shoukd consist of letters, digits and underscores only. Can I rename it to 'openqaoa_core'?

[vishal-ph]

@Newtech66, no, the path is correct. You will need to look at the dev branch. Note the comment at the end of issue description

[vishal-ph]

@devilkiller-ag, yes, you are right about the import name conventions. However, openqaoa-core is just the name of the module, the import statement still works with openqaoa. Similarly for the remaining plug-ins, they are imported with underscores in the names. For instance, openqaoa-qiskit will be imported as openqaoa_qiskit.
So, please refrain from implementing any name changes

[Newtech66]

@vishal-ph Ok, so all the new files should live in the same path as test_problems.py? Not a subfolder ./test_problems/ right?

[vishal-ph]

@Newtech66 Yes, that's correct. Although eventually, we would want to put all the problem class tests in the test_problems folder as you suggested. This would then require updating the test workflows, so that can be done later.

[vishal-ph]

Fixed in PR #254