Add package.json files to plugins and plugin tests

[janpio]

This PR adds the most rudimentary package.json possible for plugins and plugin tests.

fixes #31

[janpio]

Yay, passing tests! (on Travis at least...)

[NiklasMerz]

I also tried this and did some tests. This should fix the failed builds.

Regardless the tests don´t really do much.

[janpio]

That is indeed true - but I am looking forward to changing that (or merging a PR that changes that. Any ideas?)

[NiklasMerz]

At first it sounds complicated to test a test framework/tool. To me test are already beneficial to see if everything builds correctly.

Maybe we could add more functions to the plugins in the test folder, to test some cases. I think @purplecabbage already started to do that. We should have some successful and some failing tests in those plugins to at least cover some basics of testing.

(I could try to do some experiments when I find time in the next days)

[purplecabbage]

I believe part of the issue here was just that cordova now expects plugins to have package.json files.
There are several tests which cover, an iOS plugin, with a build error, that should fail.
This definitely could be expanded to handle more cases. I would start by adding coverage just so we can see what modules/functions are not being tested.
😸
https://github.com/apache/cordova-paramedic/blob/master/spec/testable-plugin/tests/tests.js#L34

[janpio]

package.json is now fixed an Travis is green 💚

AppVeyor still needs some work though: #37

Adding coverage is great idea.