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/usr/bin/cf-agent -D efl_returnszero_csv -Kf ./promises.cf
/usr/bin/cf-agent -D efl_returnszero_json -Kf ./promises.cf

t/efl_returnszero.t .. No subtests run 

...
  Parse errors: No plan found in TAP output
Files=1, Tests=0,  2 wallclock secs ( 0.03 usr  0.00 sys +  1.54 cusr 
+ 0.04 csys =  1.61 CPU)
Result: FAIL

#!/usr/bin/perl

...
});

$harness->runtests( @tests );

   test_args => {
      using_csv  => [ '-D efl_returnszero_csv' ],
...
      using_csv  => [ '-D', 'efl_returnszero_csv' ],
      using_json => [ '-D', 'efl_returnszero_json' ],
   },