Add config fixture and unit test validating its fields

tests/fixtures/config.yaml

@@ -0,0 +1,3 @@
+region: us-east-1
+endpoint:
+  base_domain: example.test

tests/fixtures_unittest.py

@@ -0,0 +1,21 @@
+#!/usr/bin/python
+
+import os
+import re
+import unittest
+
+
+class fixture_config_test(unittest.TestCase):
+    def test_fixture_contains_region_and_endpoint(self):
+        fixture_path = os.path.join(
+            os.path.dirname(__file__), 'fixtures', 'config.yaml')
+        with open(fixture_path, 'r') as fixture_file:
+            text = fixture_file.read()
+
+        self.assertRegex(text, r'(?m)^region:\s*\S+')
+        self.assertRegex(text, r'(?m)^endpoint:\s*$')
+        self.assertRegex(text, r'(?m)^\s+base_domain:\s*\S+')
+
+
+if __name__ == '__main__':
+    unittest.main()