Add full coverage for engine-helpers

[ierceg]

File	% Stmts	% Branch	% Funcs	% Lines	Uncovered Lines
lib/	98.75	83.05	60.71	98.75
adapted-atom-linter.js	100	66.67	100	100
engine-http-server.js	100	100	70.59	100
helper-container.js	98.51	95.45	45.45	98.51	147
logger.js	90	75	100	90	11
-------------------------	----------	----------	----------	----------	----------------
All files	98.75	83.05	60.71	98.75