Revert "Merge pull request #799 from pre-commit/temporarily_skip_npm_windows"

This reverts commit 063014ffd8, reversing
changes made to 259ef9e530.

testing/util.py

@@ -48,7 +48,16 @@ xfailif_windows_no_ruby = pytest.mark.xfail(
 def broken_deep_listdir():  # pragma: no cover (platform specific)
     if sys.platform != 'win32':
         return False
-    return True  # see #798
+    try:
+        os.listdir(str('\\\\?\\') + os.path.abspath(str('.')))
+    except OSError:
+        return True
+    try:
+        os.listdir(b'\\\\?\\C:' + b'\\' * 300)
+    except TypeError:
+        return True
+    except OSError:
+        return False
 
 
 xfailif_broken_deep_listdir = pytest.mark.xfail(