This tests the correctness of includers of forwarded children.
Note that this test needs internals object thus cannot run outside DRT.
PASS internals.includerFor(childOfElementWithoutShadow) is null
PASS internals.includerFor(childOfElementWithShadow) is null
PASS internals.includerFor(childOfElementWithShadowContent) is shadowContentOfElementWithShadowContent
PASS internals.includerFor(movingChild) is null
PASS internals.includerFor(movingChild) is null
PASS internals.includerFor(movingChild) is anotherShadowContentOfElementWithShadowContent
PASS successfullyParsed is true

TEST COMPLETE