test_object_dunder_new_is_inferred_if_decorator unexpected success in 1.6.0

[felixonmars]

Steps to reproduce

1. Run the test suite in Python 3.6.3

Current behavior

test_object_dunder_new_is_inferred_if_decorator (unittest_inference.ObjectDunderNewTest) ... unexpected success
...
Ran 764 tests in 8.279s

FAILED (skipped=52, expected failures=8, unexpected successes=1)

Expected behavior

Test passes.

python -c "from astroid import __pkginfo__; print(__pkginfo__.version)" output

1.6.0