CP-1061 Import modules in the order they were specified in config

[ahelmberger]

We would like to make the order, in which modules are loaded, deterministic. They should be imported in the order specified in karma.conf.js. E.g. given this configuration:

jspm: {
  serveFiles: ['**/*'],
  loadFiles: ['polyfills.js', '**/*.specs.js']
}

The current implementation would attempt to load all modules simultaneously. This can lead to different behavior between test runs, especially in the above case, where the first module adds some global polyfills other modules rely on.

With this changeset, all files specified in the loadFiles array will be imported sequentially.

From a perfomance perspective: we could not notice any difference between simultaneous/sequential import, tested in a project with about 400 tests and about 170 modules.

[trentgrover-wf]

@maxwellpeterson-wf @evanweible-wf

[evanweible-wf]

+1 once Trent's comment has been addressed

[rmconsole2-wf]

@ahelmberger This pull request has merge conflicts, please resolve.

[ahelmberger]

Thanks for the feedback, I rebased on the current master and used the IE8-compatible syntax.

[alexcastillo]

+1

[trentgrover-wf]

+1 @maxwellpeterson-wf @jayudey-wf

[maxwellpeterson-wf]

+1

[jayudey-wf]

QA Resource Approval: +10

• [x] Testing instruction (gathered from Max Peterson)
• [x] Dev +1's
• [x] Dev/QA +10 with detail of what was tested
  • verified that tasks were still working with this version of karma-jspm installed
• [ ] Unit test created/updated
• [x] All unit tests pass

Merging into master.