Make datastore emulator tests work locally

[sonjaer]

Hey, I just made a Pull Request!

Description

Motivation and Context

Have you tested this? If so, how?

Checklist for PR author(s)

• Changes are covered by unit test
• All tests pass
• Code coverage check passes
• Error handling is tested
• Errors are handled at the appropriate layer
• Errors that cannot be handled where they occur are propagated
• (optional) Changes are covered by system test
• Relevant documentation updated
• This PR has NO breaking change to public API
• This PR has breaking change to public API and it is documented

Checklist for PR reviewer(s)

• This PR has been incorporated in release note for the coming version
• Risky changes introduced by this PR have been all considered

[codecov]

Codecov Report

Merging #1042 (0db0394) into master (a257d29) will decrease coverage by 0.04%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master    #1042      +/-   ##
============================================
- Coverage     91.29%   91.25%   -0.04%     
+ Complexity     2111     2110       -1     
============================================
  Files           199      199              
  Lines          8269     8270       +1     
  Branches        501      502       +1     
============================================
- Hits           7549     7547       -2     
- Misses          600      602       +2     
- Partials        120      121       +1