Add another test capturing issue described in http://bugs.python.org/issue12885

setuptools/tests/test_setuptools.py

+import os
+
 import pytest
 
 import setuptools
@@ -22,3 +24,24 @@ def test_findall_curdir(example_source):
         found = list(setuptools.findall())
     expected = ['readme.txt', 'foo/bar.py']
     assert found == expected
+
+
+@pytest.fixture
+def can_symlink(tmpdir):
+    """
+    Skip if cannot create a symbolic link
+    """
+    link_fn = 'link'
+    target_fn = 'target'
+    try:
+        os.symlink(target_fn, link_fn)
+    except (OSError, NotImplementedError, AttributeError):
+        pytest.skip("Cannot create symbolic links")
+    os.remove(link_fn)
+
+
+def test_findall_missing_symlink(tmpdir, can_symlink):
+    with tmpdir.as_cwd():
+        os.symlink('foo', 'bar')
+        found = list(setuptools.findall())
+        assert found == []