Initial attempt at handling user tz in tests

[jyaw]

#56 Put a common replace_with_user_tz() function in tests/util/utilities.py that defaults to using the TIMEZONE_NAME tz in the users .env file (TIMEZONE_NAME defaults to 'America/New_York' if no .env file).

Updated the applicable date strings with -04:00 in test_therapy_event.py as a trial and it seems to work for me, test come back ok. Easy to update for relavant datestamps in the test files.

This change would need to be accounted for in the following files to make tests return ok in timezones outside of EST...

• domain/test_therapy_event.py (handled in this PR)
• parser/test_tconnect.py
• sync/test_bolus.py
• sync/test_cgm.py
• sync/test_iob.py
• test_process.py

[codecov-commenter]

Codecov Report

Merging #59 (37e3b3f) into master (ec84afd) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #59      +/-   ##
==========================================
+ Coverage   82.69%   82.72%   +0.03%     
==========================================
  Files          46       47       +1     
  Lines        3039     3045       +6     
==========================================
+ Hits         2513     2519       +6     
  Misses        526      526              

Impacted Files	Coverage Δ
tests/domain/test_therapy_event.py	100.00% <100.00%> (ø)
tests/util/utilities.py	100.00% <100.00%> (ø)

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[jwoglom]

I'll take a look at updating the Github actions configuration so that tests run with both the default America/New_York and something custom.