mbeliaev/move tests

[beliaev-maksim]

move tests to a separate tests folder

[codecov]

Codecov Report

Merging #513 (87f6e3b) into master (ebcb65f) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #513   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            6         6           
  Lines         2292      2292           
=========================================
  Hits          2292      2292           

Impacted Files	Coverage Δ
responses/tests/test_matchers.py	100.00% <ø> (ø)
responses/tests/test_responses.py	100.00% <ø> (ø)
responses/tests/test_registries.py	100.00% <100.00%> (ø)

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