Cleanup tests to avoid coroutines of the BatchManager of aiozikin

[mardiros]

Currently tests are creating a BatchManager in many tests.

The test_trace module introduce a fixture to avoid it and tests expected trace to be send instead of pushing them in the batchmanager that cannot process them.

Here is a pull request to reuse the feature in other tests.

[codecov-commenter]

Codecov Report

Merging #31 (fe6f467) into master (e46e5ca) will decrease coverage by 1.39%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #31      +/-   ##
==========================================
- Coverage   88.15%   86.75%   -1.40%     
==========================================
  Files           8        8              
  Lines         287      287              
==========================================
- Hits          253      249       -4     
- Misses         34       38       +4     

Impacted Files	Coverage Δ
starlette_zipkin/middleware.py	82.24% <100.00%> (-3.74%)	:arrow_down:

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[mchlvl]

Nice! 👍

[mardiros]

Sorry, I should let it as a draft. I will open a new merge request for the next improvement.