Added issue #20 test case.

tests/github/test_issue_0020.py

@@ -0,0 +1,55 @@
+# -*- coding: utf-8 -*-
+
+from benedict import benedict
+from benedict.serializers.yaml import yaml
+
+import unittest
+
+
+class GetAtt(yaml.YAMLObject):
+    yaml_loader = yaml.SafeLoader
+    yaml_tag = '!GetAtt'
+
+    def __init__(self, val):
+        self.val = val
+
+    @classmethod
+    def from_yaml(cls, loader, node):
+        return cls(node.value)
+
+    def __repr__(self):
+        return 'GetAtt({})'.format(self.val)
+
+yaml.add_constructor('!GetAtt', GetAtt.from_yaml)
+
+
+class github_issue_0020_test_case(unittest.TestCase):
+
+    def test_github_issue_0020(self):
+        """
+        https://github.com/fabiocaccamo/python-benedict/issues/20
+        """
+        yaml_str ="""
+AWSTemplateFormatVersion: '2010-09-09'
+Transform: AWS::Serverless-2016-10-31
+Outputs:
+    Description: "LoremIpsum Ex nisi incididunt occaecat dolor."
+    Value: !GetAtt LoremIpsum.Arn
+        """
+
+        r = {
+            'AWSTemplateFormatVersion': '2010-09-09',
+            'Transform': 'AWS::Serverless-2016-10-31',
+            'Outputs': {
+                'Description': 'LoremIpsum Ex nisi incididunt occaecat dolor.',
+                'Value': GetAtt('LoremIpsum.Arn'),
+            },
+        }
+
+        b = benedict(yaml_str, format='yaml')
+        # print(b.dump())
+
+        self.assertTrue(b['AWSTemplateFormatVersion'] == '2010-09-09')
+        self.assertTrue(b['Transform'] == 'AWS::Serverless-2016-10-31')
+        self.assertTrue(b['Outputs.Description'] == 'LoremIpsum Ex nisi incididunt occaecat dolor.')
+        self.assertTrue(isinstance(b['Outputs.Value'], GetAtt))