Import directly from wxflow in tests

[aerorahul]

Description
This PR:

• updates the tests to import modules directly from wxflow

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

• pynorms
• pytests

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes need updates to the documentation. I have made corresponding changes to the documentation
• My changes generate no new warnings
• New and existing tests pass with my changes
• Any dependent changes have been merged and published

[codecov]

Codecov Report

Merging #9 (ed99193) into develop (654f63c) will not change coverage.
The diff coverage is n/a.

❗ Current head ed99193 differs from pull request most recent head fa83df6. Consider uploading reports for the commit fa83df6 to get more accurate results

@@           Coverage Diff            @@
##           develop       #9   +/-   ##
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  Coverage    48.91%   48.91%           
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  Files           15       15           
  Lines         1429     1429           
  Branches       305      305           
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  Hits           699      699           
  Misses         676      676           
  Partials        54       54           

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[HenryRWinterbottom]

Good to go.