Add black fmt: off tags to test n-dimensional arrays

[ljvmiranda921]

Describe the bug
The problem is that whenever we have a multidimensional array for test-cases, black formats them
"vertically", resulting to a very high LOC and uglier code. See this issue

To Reproduce

$ black tests/
$ vim tests/backend/topology/test_von_neumann.py

Then check test_delannoy_numbers and observe how the n-dim array is formatted.

Expected behavior

It's better to retain the current formatting.

Environment (please complete the following information):

• OS: [e.g. Linux] Linux
• Version [e.g. Ubuntu 16.04] Ubuntu 16.04
• PySwarms Version [e.g. v.0.2.0] v.0.3.0
• Python Version [e.g. 3.6.X] 3.6.X

Additional context

We can easily solve this by using fmt: off followed by # fmt: on on specific parts of the code. However, we also need to identify parts of the code where we need to use this formatting.

[whzup]

To be honest this looks like a really ugly solution to me 😕. This would be better off as an option in the black module instead of something that has to be done manually.

[ljvmiranda921]

For now this is what we can only do. Using external files to export our predefined numpy arrays seems to convolute everything. Unless there's a better way to remove the n-dimensional arrays that we have, maybe hypothesis can make our predefined arrays more generalized (and reproducible?)