Added tests for get_metadata

- Fixed Typo

tests/test_hub/test_cg_importer.py

@@ -2,6 +2,7 @@ import unittest
 import mock
 
 import kojihub
+from koji import GenericError
 
 
 class TestCGImporter(unittest.TestCase):
@@ -9,3 +10,15 @@ class TestCGImporter(unittest.TestCase):
         # TODO -- this doesn't make sense.  A query with no arguments should
         # probably raise an exception saying "this doesn't make sense."
         kojihub.CG_Importer()  # No exception!
+
+    def test_get_metadata_is_instance(self):
+        mock_input_val = {'something': 'good val'}
+        x = kojihub.CG_Importer()
+        x.get_metadata(mock_input_val, '')
+        assert x.raw_metadata
+        assert isinstance(x.raw_metadata, str)
+
+    def test_get_metadata_is_not_instance(self):
+        x = kojihub.CG_Importer()
+        with self.assertRaises(GenericError):
+            x.get_metadata(42, '')