Added durable functions stein tests

[gavin-aguiar]

Modified durable tests and added tests for pystein

Description

Fixes #

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PR information

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• There are a small number of commits, each of which has an informative message. This means that previously merged commits do not appear in the history of the PR. For information on cleaning up the commits in your pull request, see this page.
• If applicable, the PR references the bug/issue that it fixes in the description.
• New Unit tests were added for the changes made and CI is passing.

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[codecov]

Codecov Report

Merging #1199 (3d391c2) into dev (36efc47) will decrease coverage by 51.98%.
The diff coverage is n/a.

❗ Current head 3d391c2 differs from pull request most recent head 949e167. Consider uploading reports for the commit 949e167 to get more accurate results

@@             Coverage Diff             @@
##              dev    #1199       +/-   ##
===========================================
- Coverage   83.97%   32.00%   -51.98%     
===========================================
  Files          34       34               
  Lines        1903     1903               
  Branches      366      366               
===========================================
- Hits         1598      609      -989     
- Misses        234     1293     +1059     
+ Partials       71        1       -70     

Flag	Coverage Δ
unittests	32.00% <ø> (-51.92%)	⬇️

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see 24 files with indirect coverage changes