Spectron Chromedriver Worker Service

[goosewobbler]

Prototyping a new WDIO service to allow finer grained control over Chromedriver (CD), closer to the original Spectron. Might not be necessary, but branch will be retained regardless.

EDIT: Verified that test bleed is real and not really expected - kind of annoying. Should try again to make this work.

https://webdriver.io/docs/customservices

Pros of this approach

• Should bring back the original Spectron CD behaviour (ditched in favour of greater WDIO integration)
• Retains the current level of WDIO integration (a good chunk of the work done so far on this fork)
• More control over CD
• Fewer dependencies

Cons of this approach

• Not (yet) ascertained that we can effectively restart CD between tests with a worker service.
  • If not, we may be able to work with the WDIO guys to get the desired behaviour
• Not (yet) ascertained that being able to restart CD between tests is actually a show-stopper
• More code & another package to maintain

Tasks

• import and convert wdio-chromedriver-service to TS as wdio-spectron-service
• change wdio-spectron-service to worker service
• service kills CD process on exit
• service restarts CD process between tests
• update wdio-spectron-service units for new behaviour
• publish wdio-spectron-service on NPM
• update readme for restart
• add wdio-spectron-service to WDIO CLI & docs