Ensure docstring tests always teardown

[felixwang9817]

Signed-off-by: Felix Wang wangfelix98@gmail.com

What this PR does / why we need it: Occasionally docstring tests are not cleaned up properly. This test ensures they always teardown correctly.

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

NONE

[felixwang9817]

/kind bug

[codecov-commenter]

Codecov Report

Merging #1817 (30c5776) into master (5857a55) will decrease coverage by 0.02%.
The diff coverage is 90.47%.

@@            Coverage Diff             @@
##           master    #1817      +/-   ##
==========================================
- Coverage   84.85%   84.83%   -0.03%     
==========================================
  Files          92       92              
  Lines        6828     6837       +9     
==========================================
+ Hits         5794     5800       +6     
- Misses       1034     1037       +3     

Flag	Coverage Δ
integrationtests	84.75% <90.47%> (-0.03%)	⬇️
unittests	63.96% <90.47%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
sdk/python/feast/feature_store.py	92.64% <ø> (ø)
sdk/python/tests/doctest/test_all.py	92.72% <90.47%> (-3.20%)	⬇️
sdk/python/feast/infra/provider.py	88.49% <0.00%> (-0.60%)	⬇️

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[felixwang9817]

/retest

[achals]

/lgtm

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: achals, felixwang9817

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