Separate out configuration tests

Following up on an #action from the weekly Glance meeting:
http://eavesdrop.openstack.org/meetings/glance/2019/glance.2019-01-31-13.59.log.html#l-134

Change-Id: Ic9b8c4c055345b0128ab1c8dbfabac3f20e326b6

.zuul.yaml

@@ -29,6 +29,25 @@
       - ^tox.ini$
       - ^\.zuul\.yaml$
 
+- job:
+    name: glance-code-constants-check
+    parent: tox
+    description: |
+      Tests to catch when code constants have gotten out of sync.
+    vars:
+      tox_envlist: gateonly
+    irrelevant-files:
+      - ^(test-|)requirements.txt$
+      - ^lower-constraints.txt$
+      - ^.*\.rst$
+      - ^api-ref/.*$
+      - ^doc/.*$
+      - ^etc/.*$
+      - ^releasenotes/.*$
+      - ^setup.cfg$
+      - ^tox.ini$
+      - ^\.zuul\.yaml$
+
 - job:
     name: glance-tox-oslo-tips-base
     parent: tox
@@ -217,6 +236,7 @@
         - openstack-tox-functional-py35
         - glance-eventlet-ssl-handshake-broken-py35:
             voting: false
+        - glance-code-constants-check
         - devstack-plugin-ceph-tempest:
             voting: false
             irrelevant-files:

glance/tests/gate/README

@@ -0,0 +1,11 @@
+===============
+Gate-only tests
+===============
+
+These tests catch configuration problems for some code constants that
+must be maintained manually.  We have them separated out from the other
+tests so that they can easily be run in their own gate job and don't
+affect local development.
+
+It would be nice if someone with some free time could figure out how
+to make these changes automatic (or unnecessary) ...

tox.ini

@@ -76,6 +76,18 @@ setenv =
 commands =
   stestr run --whitelist-file ./broken-functional-py35-ssl-tests.txt {posargs}
 
+[testenv:gateonly]
+# NOTE(rosmaita): these tests catch configuration problems for some code
+# constants that must be maintained manually; we have them separated out
+# so they don't affect local development
+# TODO(someone other than me): figure out how to make these changes either
+# automatic or unnecessary
+basepython = python3
+setenv =
+  TEST_PATH = ./glance/tests/gate
+commands =
+  stestr run {posargs}
+
 [testenv:pep8]
 basepython = python3
 commands =