Move options to mocha.opts

Signed-off-by: Eli Skeggs <skeggse@gmail.com>
Add tests

Signed-off-by: Eli Skeggs <skeggse@gmail.com>
Add some comments

Signed-off-by: Eli Skeggs <skeggse@gmail.com>
Move should to mocha.opts

Signed-off-by: Eli Skeggs <skeggse@gmail.com>