Include tests of secret_handlers from config yaml and some of that's implementation details

tests/config/secrets.yaml

@@ -0,0 +1,19 @@
+---
+secret_handlers:
+  dummy:
+    class: helpers.DummySecrets
+    prefix: in_config/
+  requires-env:
+    class: helpers.DummySecrets
+    # things can pull from env, it prexists
+    prefix: env/FROM_ENV_WILL_WORK
+  requires-dummy:
+    class: helpers.DummySecrets
+    # things can't pull from other handlers, the order they're configured in is
+    # indeterminent so it's not safe, they're also all added at once
+    prefix: dummy/FROM_DUMMY_WONT_WORK
+
+# Not needed, but required key
+providers: {}
+# Not needed, but required key
+zones: {}

tests/helpers.py

@@ -140,6 +140,7 @@ class CountingProcessor(BaseProcessor):
 class DummySecrets(BaseSecrets):
     def __init__(self, name, prefix):
         super().__init__(name)
+        self.log.info('__init__: name=%s, prefix=%s', name, prefix)
         self.prefix = prefix
 
     def fetch(self, name, source):

tests/test_octodns_manager.py

@@ -8,6 +8,7 @@ from unittest import TestCase
 from unittest.mock import MagicMock, patch
 
 from helpers import (
+    DummySecrets,
     DynamicProvider,
     GeoProvider,
     NoSshFpProvider,
@@ -1249,6 +1250,37 @@ class TestManager(TestCase):
         self.assertTrue(sh)
         self.assertEqual('pre-thing', sh.fetch('thing', None))
 
+        # test configuring secret handlers
+        environ['FROM_ENV_WILL_WORK'] = 'fetched_from_env/'
+        manager = Manager(get_config_filename('secrets.yaml'))
+
+        # dummy was configured
+        self.assertTrue('dummy' in manager.secret_handlers)
+        dummy = manager.secret_handlers['dummy']
+        self.assertIsInstance(dummy, DummySecrets)
+        # and has the prefix value explicitly stated in the yaml
+        self.assertEqual('in_config/hello', dummy.fetch('hello', None))
+
+        # requires-env was configured
+        self.assertTrue('requires-env' in manager.secret_handlers)
+        requires_env = manager.secret_handlers['requires-env']
+        self.assertIsInstance(requires_env, DummySecrets)
+        # and successfully pulled a value from env as its prefix
+        self.assertEqual(
+            'fetched_from_env/hello', requires_env.fetch('hello', None)
+        )
+
+        # requires-dummy was created
+        self.assertTrue('requires-dummy' in manager.secret_handlers)
+        requires_dummy = manager.secret_handlers['requires-dummy']
+        self.assertIsInstance(requires_dummy, DummySecrets)
+        # but failed to fetch a secret from dummy so we just get the configured
+        # value as it was in the yaml for prefix
+        self.assertEqual(
+            'dummy/FROM_DUMMY_WONT_WORK:hello',
+            requires_dummy.fetch(':hello', None),
+        )
+
 
 class TestMainThreadExecutor(TestCase):
     def test_success(self):