This test case asserts that imports from sibling modules are resolved correctly when the python_resolve_sibling_imports directive is enabled (default behavior). It covers 3 different types of imports in pkg/unit_test.py:

• import a - resolves to the sibling a.py in the same package
• import test_util - resolves to the sibling test_util.py in the same package
• from b import run - resolves to the sibling b.py in the same package

When sibling imports are enabled, we allow them to be satisfied by sibling modules (ie. modules in the same package).