Fix user.shadow module

Fixes an issue with the user.shadow module where it would fail
retrieving values that weren't set yet... last login for example.
Also adds some tests

salt/modules/mac_shadow.py

@@ -202,11 +202,12 @@ def get_account_created(name):
 
         salt '*' shadow.get_account_created admin
     """
-    ret = _get_account_policy_data_value(name, "creationTime")
-
-    unix_timestamp = salt.utils.mac_utils.parse_return(ret)
-
-    date_text = _convert_to_datetime(unix_timestamp)
+    try:
+        ret = _get_account_policy_data_value(name, "creationTime")
+        unix_timestamp = salt.utils.mac_utils.parse_return(ret)
+        date_text = _convert_to_datetime(unix_timestamp)
+    except CommandExecutionError:
+        date_text = "Creation date not defined"
 
     return date_text
 
@@ -228,11 +229,12 @@ def get_last_change(name):
 
         salt '*' shadow.get_last_change admin
     """
-    ret = _get_account_policy_data_value(name, "passwordLastSetTime")
-
-    unix_timestamp = salt.utils.mac_utils.parse_return(ret)
-
-    date_text = _convert_to_datetime(unix_timestamp)
+    try:
+        ret = _get_account_policy_data_value(name, "passwordLastSetTime")
+        unix_timestamp = salt.utils.mac_utils.parse_return(ret)
+        date_text = _convert_to_datetime(unix_timestamp)
+    except CommandExecutionError:
+        date_text = "Password last set date/time undefined"
 
     return date_text
 
@@ -254,9 +256,11 @@ def get_login_failed_count(name):
 
         salt '*' shadow.get_login_failed_count admin
     """
-    ret = _get_account_policy_data_value(name, "failedLoginCount")
-
-    return salt.utils.mac_utils.parse_return(ret)
+    try:
+        ret = _get_account_policy_data_value(name, "failedLoginCount")
+        return salt.utils.mac_utils.parse_return(ret)
+    except CommandExecutionError:
+        return "Failed login count undefined"
 
 
 def get_login_failed_last(name):
@@ -277,11 +281,12 @@ def get_login_failed_last(name):
 
         salt '*' shadow.get_login_failed_last admin
     """
-    ret = _get_account_policy_data_value(name, "failedLoginTimestamp")
-
-    unix_timestamp = salt.utils.mac_utils.parse_return(ret)
-
-    date_text = _convert_to_datetime(unix_timestamp)
+    try:
+        ret = _get_account_policy_data_value(name, "failedLoginTimestamp")
+        unix_timestamp = salt.utils.mac_utils.parse_return(ret)
+        date_text = _convert_to_datetime(unix_timestamp)
+    except CommandExecutionError:
+        date_text = "Last failed login undefined"
 
     return date_text
 

tests/pytests/unit/modules/test_mac_shadow.py

@@ -0,0 +1,69 @@
+"""
+Unit Tests for the mac_desktop execution module.
+"""
+
+import pytest
+
+import salt.modules.mac_shadow as mac_shadow
+from salt.exceptions import CommandExecutionError
+from tests.support.mock import patch
+
+pytestmark = [
+    pytest.mark.skip_unless_on_darwin,
+]
+
+
+def test_get_account_created():
+    with patch("_get_account_policy_data_value", return_value=0):
+        result = mac_shadow.get_account_created("junk")
+        expected = "1969-12-31 17:00:00"
+        assert result == expected
+
+
+def test_get_account_created_error():
+    with patch("_get_account_policy_data_value", side_effect=CommandExecutionError):
+        result = mac_shadow.get_account_created("junk")
+        expected = "Creation date not defined"
+        assert result == expected
+
+
+def test_get_last_change():
+    with patch("_get_account_policy_data_value", return_value=0):
+        result = mac_shadow.get_last_change("junk")
+        expected = "1969-12-31 17:00:00"
+        assert result == expected
+
+
+def test_get_last_change_error():
+    with patch("_get_account_policy_data_value", side_effect=CommandExecutionError):
+        result = mac_shadow.get_last_change("junk")
+        expected = "Password last set date/time undefined"
+        assert result == expected
+
+
+def test_login_failed_count():
+    with patch("_get_account_policy_data_value", return_value=0):
+        result = mac_shadow.get_login_failed_count("junk")
+        expected = "0"
+        assert result == expected
+
+
+def test_get_login_failed_count_error():
+    with patch("_get_account_policy_data_value", side_effect=CommandExecutionError):
+        result = mac_shadow.get_login_failed_count("junk")
+        expected = "Failed login count undefined"
+        assert result == expected
+
+
+def test_login_failed_last():
+    with patch("_get_account_policy_data_value", return_value=0):
+        result = mac_shadow.get_login_failed_last("junk")
+        expected = "1969-12-31 17:00:00"
+        assert result == expected
+
+
+def test_get_login_failed_last_error():
+    with patch("_get_account_policy_data_value", side_effect=CommandExecutionError):
+        result = mac_shadow.get_login_failed_last("junk")
+        expected = "Last failed login undefined"
+        assert result == expected