handle credential.inputs in decryption utils

awx/main/tests/unit/test_tasks.py

@@ -1656,6 +1656,7 @@ class TestJobCredentials(TestJobExecution):
                 'password': 'secret'
             }
         )
+        azure_rm_credential.inputs['secret'] = ''
         azure_rm_credential.inputs['secret'] = encrypt_field(azure_rm_credential, 'secret')
         self.instance.credentials.add(azure_rm_credential)
 
@@ -2089,6 +2090,7 @@ class TestInventoryUpdateCredentials(TestJobExecution):
                     'host': 'https://keystone.example.org'
                 }
             )
+            cred.inputs['ssh_key_data'] = ''
             cred.inputs['ssh_key_data'] = encrypt_field(
                 cred, 'ssh_key_data'
             )

awx/main/tests/unit/utils/test_encryption.py

@@ -2,6 +2,8 @@
 
 # Copyright (c) 2017 Ansible, Inc.
 # All Rights Reserved.
+import pytest
+
 from awx.conf.models import Setting
 from awx.main.utils import encryption
 
@@ -45,6 +47,16 @@ def test_encrypt_field_with_empty_value():
     assert encrypted is None
 
 
+def test_encrypt_field_with_undefined_attr_raises_expected_exception():
+    with pytest.raises(AttributeError):
+        encryption.encrypt_field({}, 'undefined_attr')
+
+
+def test_decrypt_field_with_undefined_attr_raises_expected_exception():
+    with pytest.raises(AttributeError):
+        encryption.decrypt_field({}, 'undefined_attr')
+
+
 class TestSurveyReversibilityValue:
     '''
     Tests to enforce the contract with survey password question encrypted values