Adding tests to scil_dwi_reorder_philips.py

[karanphil]

Quick description

I added tests for scil_dwi_reorder_philips.py, to increase our codecov. I had to create the gtab and json files on the fly. ...

Type of change

Check the relevant options.

• [ ] 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

Provide data, screenshots, command line to test (if relevant)

...

Checklist

• [ ] My code follows the style guidelines of this project (run autopep8)
• [ ] I added relevant citations to scripts, modules and functions docstrings and descriptions
• [ ] I have performed a self-review of my code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] My changes generate no new warnings
• [ ] I moved all functions from the script file (except the argparser and main) to scilpy modules
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] New and existing unit tests pass locally with my changes

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 68.39%. Comparing base (594fbb7) to head (5351cea).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #919 +/- ## ========================================== + Coverage 68.25% 68.39% +0.13% ========================================== Files 388 388 Lines 20950 20950 Branches 3216 3216 ========================================== + Hits 14300 14328 +28 + Misses 5363 5334 -29 - Partials 1287 1288 +1 ``` | [Components](https://app.codecov.io/gh/scilus/scilpy/pull/919/components?src=pr&el=components&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=scilus) | Coverage Δ | | |---|---|---| | [Scripts](https://app.codecov.io/gh/scilus/scilpy/pull/919/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=scilus) | `71.13% <100.00%> (+0.21%)` | :arrow_up: | | [Library](https://app.codecov.io/gh/scilus/scilpy/pull/919/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=scilus) | `63.64% <ø> (ø)` | |