Specifying project-domain for project

The fix ensures that if a user wants to set a default project,
they must also provide the project domain. If it's missing,
an explicit error message is shown, making it clear that the
project domain is required.

Also adding some unit tests by modifying respective calls.

Change-Id: Ia6e921a53da55ab1bce85a42c8160872a9d47d64
Closes-Bug: #2102146
(cherry picked from commit 2883f3fb957ca79b984f8b9e312ee500f2194aab)

openstackclient/identity/v3/user.py

@@ -612,10 +612,12 @@ class SetUser(command.Command):
         if parsed_args.description:
             kwargs['description'] = parsed_args.description
         if parsed_args.project:
-            project_domain_id = identity_client.find_domain(
-                name_or_id=parsed_args.project_domain,
-                ignore_missing=False,
-            ).id
+            project_domain_id = None
+            if parsed_args.project_domain:
+                project_domain_id = identity_client.find_domain(
+                    name_or_id=parsed_args.project_domain,
+                    ignore_missing=False,
+                ).id
             project_id = identity_client.find_project(
                 name_or_id=parsed_args.project,
                 ignore_missing=False,

openstackclient/tests/unit/identity/v3/test_user.py

@@ -1206,6 +1206,17 @@ class TestUserSet(identity_fakes.TestIdentityv3):
         self.identity_sdk_client.update_user.assert_called_with(
             user=self.user, **kwargs
         )
+        self.identity_sdk_client.find_domain.assert_not_called()
+
+        # Set expected values
+        kwargs = {
+            'ignore_missing': False,
+            'domain_id': None,
+        }
+        self.identity_sdk_client.find_project.assert_called_once_with(
+            name_or_id=self.project.id, **kwargs
+        )
+
         self.assertIsNone(result)
 
     def test_user_set_project_domain(self):
@@ -1238,6 +1249,11 @@ class TestUserSet(identity_fakes.TestIdentityv3):
         self.identity_sdk_client.update_user.assert_called_with(
             user=self.user, **kwargs
         )
+
+        self.identity_sdk_client.find_domain.assert_called_once_with(
+            name_or_id=self.project.domain_id, ignore_missing=False
+        )
+
         self.assertIsNone(result)
 
     def test_user_set_enable(self):