Call os.path.normpath to normalize paths for comp

changelog.d/1519.change.rst

+Perform additional path normalization to ensure path values to a directory is always the same, preventing false positives when checking scripts have a consistent prefix to set up on Windows.

pkg_resources/__init__.py

@@ -2228,7 +2228,7 @@ register_namespace_handler(object, null_ns_handler)
 
 def normalize_path(filename):
     """Normalize a file/dir name for comparison purposes"""
-    return os.path.normcase(os.path.realpath(filename))
+    return os.path.normcase(os.path.normpath(os.path.realpath(filename)))
 
 
 def _normalize_cached(filename, _cache={}):

pkg_resources/tests/test_pkg_resources.py

@@ -236,3 +236,8 @@ class TestDeepVersionLookupDistutils:
         req = pkg_resources.Requirement.parse('foo>=1.9')
         dist = pkg_resources.WorkingSet([env.paths['lib']]).find(req)
         assert dist.version == version
+
+    def test_normalize_path(self, tmpdir):
+        path = str(tmpdir)
+        expected = os.path.normcase(os.path.normpath(os.path.realpath(path)))
+        assert pkg_resources.normalize_path(path) == expected