anchor.diff:  
   %% Test cases
   -export([
  +         %% *** API Misc ***
  +         api_m_debug/1,
  +
            %% *** API Basic ***
            api_b_open_and_close_udp4/1,
            api_b_open_and_close_tcp4/1,
  
positive.code: 
  groups() -> 
      [{api,                        [], api_cases()},
       {api_basic,                  [], api_basic_cases()},
       {api_async,                  [], api_async_cases()},
       {api_options,                [], api_options_cases()},
  
negative.code:      
  api_cases() ->
      [
       {group, api_misc},
       {group, api_basic},
       {group, api_async},
       {group, api_options},
       {group, api_op_with_timeout}
      ].
  
  api_misc_cases() ->
      [
       api_m_debug
      ].
  
  api_basic_cases() ->
  