feat: import external management columns (#19315)

* feat: import flags

* Add tests

tests/unit_tests/dashboards/commands/importers/v1/import_test.py

@@ -0,0 +1,67 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+# pylint: disable=unused-argument, import-outside-toplevel, unused-import, invalid-name
+
+import copy
+
+from sqlalchemy.orm.session import Session
+
+
+def test_import_dashboard(app_context: None, session: Session) -> None:
+    """
+    Test importing a dashboard.
+    """
+    from superset.connectors.sqla.models import SqlaTable
+    from superset.dashboards.commands.importers.v1.utils import import_dashboard
+    from superset.models.core import Database
+    from superset.models.slice import Slice
+    from tests.integration_tests.fixtures.importexport import dashboard_config
+
+    engine = session.get_bind()
+    Slice.metadata.create_all(engine)  # pylint: disable=no-member
+
+    config = copy.deepcopy(dashboard_config)
+
+    dashboard = import_dashboard(session, config)
+    assert dashboard.dashboard_title == "Test dash"
+    assert dashboard.description is None
+    assert dashboard.is_managed_externally is False
+    assert dashboard.external_url is None
+
+
+def test_import_dashboard_managed_externally(
+    app_context: None, session: Session
+) -> None:
+    """
+    Test importing a dashboard that is managed externally.
+    """
+    from superset.connectors.sqla.models import SqlaTable
+    from superset.dashboards.commands.importers.v1.utils import import_dashboard
+    from superset.models.core import Database
+    from superset.models.slice import Slice
+    from tests.integration_tests.fixtures.importexport import dashboard_config
+
+    engine = session.get_bind()
+    Slice.metadata.create_all(engine)  # pylint: disable=no-member
+
+    config = copy.deepcopy(dashboard_config)
+    config["is_managed_externally"] = True
+    config["external_url"] = "https://example.org/my_dashboard"
+
+    dashboard = import_dashboard(session, config)
+    assert dashboard.is_managed_externally is True
+    assert dashboard.external_url == "https://example.org/my_dashboard"