chore(tests): increasing test coverage

[william20111]

What

• adding more tests

Why

• get each test implementation consistent coverage

[codecov[bot]]

Codecov Report

Merging #41 into master will increase coverage by 1.65%. The diff coverage is 73.80%.

@@            Coverage Diff             @@
##           master      #41      +/-   ##
==========================================
+ Coverage   72.97%   74.63%   +1.65%     
==========================================
  Files          15       15              
  Lines         544      544              
==========================================
+ Hits          397      406       +9     
+ Misses         83       74       -9     
  Partials       64       64              

Impacted Files	Coverage Δ
agent_agent.go	75.60% <ø> (+7.31%)	:arrow_up:
dns_server.go	75.60% <0.00%> (ø)
ftp_server.go	75.60% <75.60%> (ø)
bgp.go	75.60% <0.00%> (+7.31%)	:arrow_up:
agent_server.go	75.60% <0.00%> (+7.31%)	:arrow_up:

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