fix(ngMock/$controller): respect $compileProvider.preAssignBindingsEnabled()

[gkalpak]

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
Bug fix.

What is the current behavior? (You can also link to an open issue here)
ngMock's $controller service always pre-assigns bindings (if available), regardless of the value of $compileProvider.preAssignBindingsEnabled(). This may cause false positives or negatives in tests.
See #15387.

What is the new behavior (if this is a feature change)?
ngMock's $controller service does not pre-assign bindings (if available), unless $compileProvider.preAssignBindingsEnabled() returns true.

Does this PR introduce a breaking change?
No.

Please check if the PR fulfills these requirements

• The commit message follows our guidelines: https://github.com/angular/angular.js/blob/master/CONTRIBUTING.md#commit-message-format
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

Other information:
Fixes #15387

[petebacondarwin]

LGTM as long as Travis is happy.
(Although I am not that keen on using forEach([true, false], function(enabled) { style tests. I would rather just duplicate. But not enough to force a change here.)

[gkalpak]

It turned out forEach() is not available in modules test.Since I had to change the tests anyway, I took the opportunity to split them as well. I'll wait for Travis to be happy and merge.
(cc @petebacondarwin)

[petebacondarwin]

Travis seems happy. Feel free to merge.

[arkaitzgarro]

This change ended up on 1.5.10 release. Is this correct? Because I can see here was assigned to 1.6.0-rc.1 milestone. Our unit tests are failing now if we use angular-mocks 1.5.10: TypeError: undefined is not a constructor (evaluating 'compileProvider.preAssignBindingsEnabled()')

[gkalpak]

Yes, this was intentional. This is complementary to the new $compileProvider.preAssignBindingsEnabled() .
Make sure you use matching versions of core angular (angular.js) and external modules (angular-mocks.js, angular-animate.js etc).