Added ability to run initial commands for a program.

[takaczapka]

This pull request adds the ability to run commands on init when the application starts. In our case we needed this functionality to test our application. Please review and give any feedback so that this can be incorporated in the official repo.

[gdotdesign]

It's a nice feature 😄 and the PR looks good 👍 I can merge and do a release if you exclude the last commit.

[kingsleyh]

This pull request will be superseded by a better solution coming later today

[takaczapka]

Hello again, the previous change was no good. We have found out a few issues with it:

• command was run only once for all tests, but it should run for each test, the same way appInit() is run,
• It was having problems when initCmd was using a command which was using HTTP directly (not through Task.perform Message) - then HTTP mocks wouldn't get initialized in time

Current implementation is solving those problems. I hope it is good enough in your opinion to be merged into original code. Thanks a lot and please let me know what you think!

[takaczapka]

Hello,

Please let me know if you need any help or information regarding this pull request. I'm happy to pair with you if something is unclear.

There's one more change we would like to incorporate into elm-spec. It's a about inputing data through ports. Please check https://github.com/takaczapka/elm-spec/tree/chupa "Interaction with ports" documentation section.

Cheers,
Maciej

[samstickland]

Hi,

I have need of this PR too. Is there anything I can help with to get this merged?