Test helper

[rorticus]

Copying the custom loader from https://github.com/dojo/shim/pull/114/files#diff-f2f1547c4e267fa797af2b73e3456bd3R1 and injecting into the intern config automagically.

This loader loads the @dojo/loader, configures it with @dojo/shim/util/amd and loads @dojo/shim/main to load the TS helpers.

This removes a bunch of boilerplate config from the other packages. Unfortunately this doesn't work when testing @dojo/shim, since the loader is different, so we have to provide a way to override the loader.

[codecov]

Codecov Report

Merging #169 into master will increase coverage by 0.9%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master     #169     +/-   ##
=========================================
+ Coverage   69.62%   70.53%   +0.9%     
=========================================
  Files          27       28      +1     
  Lines         642      655     +13     
  Branches      102      104      +2     
=========================================
+ Hits          447      462     +15     
+ Misses        186      184      -2     
  Partials        9        9

Impacted Files	Coverage Δ
options/intern.ts	100% <100%> (+100%)	⬆️
lib/intern/internLoader.js	80% <0%> (ø)

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[kitsonk]

No tests?

[rorticus]

@kitsonk well... the test helper is loaded by intern so there isn't any coverage info for that. I can try to mock the global intern methods and then load the script from a test. Could get some coverage that way. Also.. it looks like the intern task doesn't have any tests right now 😛

With all that being said. I'm happy to add the tests if we want to put that additional time in as part of this PR.

[rorticus]

Tested this with @dojo/widget-core to ensure backwards compatibility, we should be able to release this now and existing packages will work.

[rorticus]

I don't know that I technically need this as it is already loaded by intern...