move tests for registries to separate file

[beliaev-maksim]

same as #434

[codecov]

Codecov Report

Merging #474 (2aaef9d) into master (a552398) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #474   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         6    +1     
  Lines         2026      2030    +4     
=========================================
+ Hits          2026      2030    +4     

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

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