Add test to check spec directories

When submitting specs one very common mistake is to submit it to
specs/liberty/ instead of specs/liberty/approved/. Add a new test to
make sure submitted specs are not in the wrong directory.

Test output:

MismatchError: 'foo.rst' not in
['redirects', 'implemented', 'approved']: Found unexpected file in
'specs/liberty', specs should be submitted to 'specs/liberty/approved'

Change-Id: I27a532dc0b85d712698821d77555d2aeb57e83a1

tests/test_directories.py

@@ -0,0 +1,32 @@
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+import glob
+import os
+
+import testtools
+
+
+class TestDirectories(testtools.TestCase):
+
+    def test_directories(self):
+        releases = [x.split('/')[1] for x in glob.glob('specs/*/')]
+        for release in releases:
+            files = os.listdir("specs/%s/" % release)
+            valid = ['redirects', 'implemented', 'approved']
+            for name in files:
+                if name.startswith('.'):
+                    continue
+                self.assertIn(name, valid,
+                              "Found unexpected file in "
+                              "'specs/%s', specs should be submitted to "
+                              "'specs/%s/approved'" % (release, release))