Rewrite some unit-integration-tests to unit-tests (#206)

[StefH]

No description provided.

[codecov]

Codecov Report

Merging #207 into master will increase coverage by 1.11%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #207      +/-   ##
==========================================
+ Coverage   76.12%   77.24%   +1.11%     
==========================================
  Files          94       95       +1     
  Lines        3477     3511      +34     
  Branches      444      444              
==========================================
+ Hits         2647     2712      +65     
+ Misses        660      636      -24     
+ Partials      170      163       -7

Impacted Files	Coverage Δ
src/WireMock.Net/Mapping.cs	100% <ø> (ø)	⬆️
src/WireMock.Net/Server/FluentMockServer.Admin.cs	54.68% <ø> (+0.08%)	⬆️
src/WireMock.Net/Owin/MappingMatcher.cs	96.42% <ø> (ø)
src/WireMock.Net/Owin/WireMockMiddleware.cs	91.66% <ø> (+22.31%)	⬆️
src/WireMock.Net/Serialization/MappingConverter.cs	25.86% <ø> (ø)	⬆️
src/WireMock.Net/Owin/GlobalExceptionMiddleware.cs	73.68% <ø> (+9.39%)	⬆️
src/WireMock.Net/ResponseBuilders/Response.cs	90.1% <ø> (+0.48%)	⬆️
src/WireMock.Net/Owin/OwinSelfHost.cs	98.3% <ø> (+0.09%)	⬆️
...rc/WireMock.Net/Owin/Mappers/OwinResponseMapper.cs	88.46% <ø> (ø)
src/WireMock.Net/Server/FluentMockServer.cs	57.6% <ø> (+5.6%)	⬆️
... and 16 more

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