Add unit tests for config parsing

I verified that these tests fail on python 3.5.1 without the
fixes to pyami.config.

tests/unit/pyami/test_config.py

@@ -0,0 +1,63 @@
+# Copyright (c) 2016 Amazon.com, Inc. or its affiliates.  All Rights Reserved
+#
+# Permission is hereby granted, free of charge, to any person obtaining a
+# copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish, dis-
+# tribute, sublicense, and/or sell copies of the Software, and to permit
+# persons to whom the Software is furnished to do so, subject to the fol-
+# lowing conditions:
+#
+# The above copyright notice and this permission notice shall be included
+# in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL-
+# ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+# SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+# IN THE SOFTWARE.
+#
+from tests.compat import mock, unittest
+
+from boto.pyami import config
+from boto.compat import StringIO
+
+
+class TestCanLoadConfigFile(unittest.TestCase):
+    maxDiff = None
+
+    def setUp(self):
+        self.file_contents = StringIO()
+        file_contents = StringIO(
+            '[Boto]\n'
+            'https_validate_certificates = true\n'
+            'other = false\n'
+            'http_socket_timeout = 1\n'
+            '[Credentials]\n'
+            'aws_access_key_id=foo\n'
+            'aws_secret_access_key=bar\n'
+        )
+        self.config = config.Config(fp=file_contents)
+
+    def test_can_get_bool(self):
+        self.assertTrue(
+            self.config.getbool('Boto', 'https_validate_certificates'))
+        self.assertFalse(self.config.getbool('Boto', 'other'))
+        self.assertFalse(self.config.getbool('Boto', 'does-not-exist'))
+
+    def test_can_get_int(self):
+        self.assertEqual(self.config.getint('Boto', 'http_socket_timeout'), 1)
+        self.assertEqual(self.config.getint('Boto', 'does-not-exist'), 0)
+        self.assertEqual(
+            self.config.getint('Boto', 'does-not-exist', default=20), 20)
+
+    def test_can_get_strings(self):
+        self.assertEqual(
+            self.config.get('Credentials', 'aws_access_key_id'), 'foo')
+        self.assertIsNone(
+            self.config.get('Credentials', 'no-exist'))
+        self.assertEqual(
+            self.config.get('Credentials', 'no-exist', 'default-value'),
+            'default-value')