Use pytest's fixtures to reduce repetition across tests

[prady0t]

Pytest offers various features, one of them being the use of fixtures. This helps us better manage the tests and setup preconditions. Using the pytest.mark.parameterize fixture helps us give multiple inputs to test functions.
Learn more : https://docs.pytest.org/en/stable/how-to/parametrize.html.

We can take for example

        assert isinstance(processed[1][0][0], np.ndarray)
        assert isinstance(processed[1][0][1], np.ndarray)
        assert isinstance(processed[1][1], np.ndarray)

inside a fixture and work up things accordingly.

[prady0t]

@agriyakhetarpal We can put this for hacktoberfest.

[agriyakhetarpal]

I added the labels – additionally, could you please link to some code examples (a few low-hanging fruits) where you've noticed that this is the case, so that it's easier for potential contributors to know what to start with?

[Aswinr24]

Hey would love to pick up this issue !
I understand that we must set up fixtures to handle multiple cases here and thereby consolidating tests for different inputs into a single, reusable function, therefore making the code more concise.
Can I start working on this ?

[arjxn-py]

Sure @Aswinr24, feel free to work on this and also don't hesitate to let us know if you need help at any point :)

[Aswinr24]

Could You Please Review my PR and suggest if any changes are required