add e2e test for simple streaming server

[AdolfoVillalobos]

Before submitting

• Was this discussed/agreed via a Github issue? (no need for typos and docs improvements)
• Did you read the contributor guideline, Pull Request section?
• Did you make sure to update the docs?
• Did you write any new necessary tests?

What does this PR do?

Fixes #67:

• Added end-to-end test for the simple streaming server case, which was missing.

I hope I understood the issue correctly.! I'm entirely open to suggestions.

Did you have fun?

Yess. I hope I can contribute to this cool project :)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84%. Comparing base (c1b6ad4) to head (d6ca0e3).
Report is 1 commits behind head on main.

Additional details and impacted files

@@         Coverage Diff         @@
##           main   #247   +/-   ##
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  Coverage    84%    84%           
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  Files        13     13           
  Lines      1056   1056           
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  Hits        890    890           
  Misses      166    166           

[aniketmaurya]

Awesome, looks great @AdolfoVillalobos!! Added few comments.