Fixed ImportsEFactory2Test! This takes care of:

Console log: !MESSAGE
org.eclipse.xtext.resource.impl.DefaultResourceDescriptionStrategy  -
Reference from platform:/resource/small/src/aTestModel.efactory#/3 to
testmodel.impl.SingleRequiredImpl@30d907cb (parentAttribute: false)
(name: null) cannot be exported as the target is not contained in a
resource.

Problem Marker / Error view: The feature 'linkToSingleRequired' of
'testmodel.impl.TestModelImpl@20f6adce{platform:/resource/small/src/aTestModel.efactory#/3}'
contains a dangling reference
'testmodel.impl.SingleRequiredImpl@30d907cb{#//}'