Verify query metadata for assessment dashboards during unit tests (#294)

Created a Unit Test to Dashboards to avoid install failures.
Closes issue #278

---------

Co-authored-by: Serge Smertin <[email protected]>

Author: FastLee

tests/unit/assessment/test_dashboard.py

@@ -0,0 +1,44 @@
+import io
+
+import yaml
+from databricks.sdk.service import iam
+from databricks.sdk.service.sql import (
+    Dashboard,
+    DataSource,
+    Query,
+    Visualization,
+    Widget,
+)
+
+from databricks.labs.ucx.config import GroupsConfig, WorkspaceConfig
+from databricks.labs.ucx.framework.dashboards import DashboardFromFiles
+from databricks.labs.ucx.install import WorkspaceInstaller
+
+
+def test_dashboard(mocker):
+    ws = mocker.Mock()
+    ws.current_user.me = lambda: iam.User(user_name="[email protected]", groups=[iam.ComplexValue(display="admins")])
+    ws.config.host = "https://foo"
+    ws.config.is_aws = True
+    config_bytes = yaml.dump(WorkspaceConfig(inventory_database="a", groups=GroupsConfig(auto=True)).as_dict()).encode(
+        "utf8"
+    )
+    ws.workspace.download = lambda _: io.BytesIO(config_bytes)
+    ws.data_sources.list = lambda: [DataSource(id="bcd", warehouse_id="000000")]
+    ws.dashboards.create.return_value = Dashboard(id="abc")
+    ws.queries.create.return_value = Query(id="abc")
+    ws.query_visualizations.create.return_value = Visualization(id="abc")
+    ws.dashboard_widgets.create.return_value = Widget(id="abc")
+    installer = WorkspaceInstaller(ws)
+    local_query_files = installer._find_project_root() / "src/databricks/labs/ucx/assessment/queries"
+    dash = DashboardFromFiles(
+        ws,
+        local_folder=local_query_files,
+        remote_folder="/users/not_a_real_user/queries",
+        name="Assessment",
+        warehouse_id="000000",
+        query_text_callback=installer._replace_inventory_variable,
+    )
+    dashboard = dash.create_dashboard()
+    assert dashboard is not None
+    assert dashboard == "abc"