this mode works differently from dev in that it creates a merged package.json
file, so we have both the dependencies of the template and of the app available
in case of overlapping keys the values from the app are preferred over those
from the template. This is typically a requirement to successfully run tests.

Merging is done using jq's multiply function and probably has some limitations I'm
currently not aware of. So far it seems to be working.

since v4 To avoid false positives and encourage better testing practices, Mocha
will no longer automatically kill itself via process.exit() when it thinks it
should be done running.

While probably somewhat desirable behaviour during development, this is
definitely not wanted in a ci setting. for now forcing the old behaviour to
exit. this should probably be a flag though

see https://boneskull.com/mocha-v4-nears-release/#mochawontforceexit

…-template into feature-support-tests

This was originally added in 525879a