Testing new SB properties

[hallvictoria]

Description

Adds testing for new properties added to ServiceBus.

Fixes https://github.com/Azure/azure-functions-pyfx-planning/issues/175

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PR information

• The title of the PR is clear and informative.
• 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.

Quality of Code and Contribution Guidelines

• I have read the contribution guidelines.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.29%. Comparing base (b97a4ad) to head (57fefa3).

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #1425   +/-   ##
=======================================
  Coverage   85.29%   85.29%           
=======================================
  Files          35       35           
  Lines        1965     1965           
  Branches      370      370           
=======================================
  Hits         1676     1676           
  Misses        216      216           
  Partials       73       73           

Flag	Coverage Δ
unittests	85.24% <ø> (ø)

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