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diff --git a/cxmanage_api/tests/test_credentials.py b/cxmanage_api/tests/test_credentials.py
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+++ b/cxmanage_api/tests/test_credentials.py
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+# Copyright (c) 2012-2013, Calxeda Inc.
+#
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+# * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+# * Redistributions in binary form must reproduce the above copyright
+# notice, this list of conditions and the following disclaimer in the
+# documentation and/or other materials provided with the distribution.
+# * Neither the name of Calxeda Inc. nor the names of its contributors
+# may be used to endorse or promote products derived from this software
+# without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
+# TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+# THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
+# DAMAGE.
+
+import unittest
+
+from cxmanage_api.credentials import Credentials
+
+
+class TestCredentials(unittest.TestCase):
+    """ Unit tests for the Credentials class """
+    def test_default(self):
+        """ Test default Credentials object """
+        creds = Credentials()
+        self.assertEqual(vars(creds), Credentials.defaults)
+
+    def test_from_dict(self):
+        """ Test Credentials instantiated with a dict """
+        creds = Credentials({"linux_password": "foo"})
+        expected = dict(Credentials.defaults)
+        expected["linux_password"] = "foo"
+        self.assertEqual(vars(creds), expected)
+
+    def test_from_kwargs(self):
+        """ Test Credentials instantiated with kwargs """
+        creds = Credentials(linux_password="foo")
+        expected = dict(Credentials.defaults)
+        expected["linux_password"] = "foo"
+        self.assertEqual(vars(creds), expected)
+
+    def test_from_credentials(self):
+        """ Test Credentials instantiated with other Credentials """
+        creds = Credentials(Credentials(linux_password="foo"))
+        expected = dict(Credentials.defaults)
+        expected["linux_password"] = "foo"
+        self.assertEqual(vars(creds), expected)
+
+    def test_fails_on_invalid(self):
+        """ Test that we don't allow unrecognized credentials """
+        with self.assertRaises(ValueError):
+            Credentials({"desire_to_keep_going": "Very Low"})
+        with self.assertRaises(ValueError):
+            Credentials(magical_mystery_cure="Writing silly strings!")