tests: Add test for config file priority order

This was documented in the docstring but we had nothing to assert it in
tests. Correct that gap.

Change-Id: I4002e7fe18c43eb5f9ba2eae16022d7da87f790d
Signed-off-by: Stephen Finucane <sfinucan@redhat.com>

1 files changed, 39 insertions, 6 deletions

diff --git a/oslo_config/tests/test_cfg.py b/oslo_config/tests/test_cfg.py
index 505cb00..0686eca 100644
--- a/oslo_config/tests/test_cfg.py
+++ b/oslo_config/tests/test_cfg.py
@@ -264,8 +264,10 @@ class HelpTestCase(BaseTestCase):
 class FindConfigFilesTestCase(BaseTestCase):
 
     def test_find_config_files(self):
-        config_files = [os.path.expanduser('~/.blaa/blaa.conf'),
-                        '/etc/foo.conf']
+        config_files = [
+            os.path.expanduser('~/.blaa/blaa.conf'),
+            '/etc/foo.conf',
+        ]
 
         self.useFixture(fixtures.MonkeyPatch('sys.argv', ['foo']))
         self.useFixture(fixtures.MonkeyPatch('os.path.exists',
@@ -273,11 +275,42 @@ class FindConfigFilesTestCase(BaseTestCase):
 
         self.assertEqual(cfg.find_config_files(project='blaa'), config_files)
 
+    def test_find_config_files_overrides(self):
+        """Ensure priority of directories is enforced.
+
+        Ensure we will only ever return two files: $project.conf and
+        $prog.conf.
+        """
+        config_files = [
+            os.path.expanduser('~/.foo/foo.conf'),
+            # no '~/.foo/bar.conf' to make sure we fall through
+            os.path.expanduser('~/foo.conf'),
+            os.path.expanduser('~/bar.conf'),
+            '/etc/foo/foo.conf',
+            '/etc/foo/bar.conf',
+            '/etc/foo.conf',
+            '/etc/bar.conf',
+        ]
+
+        self.useFixture(fixtures.MonkeyPatch(
+            'os.path.exists', lambda p: p in config_files))
+
+        expected = [
+            os.path.expanduser('~/.foo/foo.conf'),
+            os.path.expanduser('~/bar.conf'),
+        ]
+        actual = cfg.find_config_files(project='foo', prog='bar')
+        self.assertEqual(expected, actual)
+
     def test_find_config_files_snap(self):
-        config_files = ['/snap/nova/current/etc/blaa/blaa.conf',
-                        '/var/snap/nova/common/etc/blaa/blaa.conf']
-        fake_env = {'SNAP': '/snap/nova/current/',
-                    'SNAP_COMMON': '/var/snap/nova/common/'}
+        config_files = [
+            '/snap/nova/current/etc/blaa/blaa.conf',
+            '/var/snap/nova/common/etc/blaa/blaa.conf',
+        ]
+        fake_env = {
+            'SNAP': '/snap/nova/current/',
+            'SNAP_COMMON': '/var/snap/nova/common/',
+        }
 
         self.useFixture(fixtures.MonkeyPatch('sys.argv', ['foo']))
         self.useFixture(fixtures.MonkeyPatch('os.path.exists',