add unit tests

[TrumanH]

Description

Add unit tests against proxy state.

[codecov-commenter]

Codecov Report

Merging #1055 (1a9923e) into develop (dc1d502) will increase coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #1055      +/-   ##
===========================================
+ Coverage    54.22%   54.23%   +0.01%     
===========================================
  Files          301      301              
  Lines        26604    26604              
===========================================
+ Hits         14427    14430       +3     
+ Misses       10512    10511       -1     
+ Partials      1665     1663       -2     

Impacted Files	Coverage Δ
bfe_websocket/server_conn.go	74.24% <0.00%> (-1.52%)	⬇️
bfe_spdy/server_conn.go	78.09% <0.00%> (-0.45%)	⬇️
bfe_spdy/frame_write.go	50.50% <0.00%> (+1.01%)	⬆️
bfe_spdy/server_write_sched.go	80.00% <0.00%> (+1.53%)	⬆️
...e_modules/mod_trust_clientip/mod_trust_clientip.go	46.15% <0.00%> (+3.29%)	⬆️

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