Fixing tests QUBO and typing

[KilianPoirier]

Description

• Please include a summary of the changes and the related issue
• Please also include relevant context.
• List any dependencies that are required for this change, if any.
• Fixes # (issue)

Checklist

• I have performed a self-review of my code.
• I have commented my code and used numpy-style docstrings
• I have made corresponding updates to the documentation.
• My changes generate no new warnings
• I have added/updated tests to make sure bugfix/feature works.
• New and existing unit tests pass locally with my changes.

Type of change

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Name the new unit-tests that you have added along with this change.