actual add the file, Pycharm was new to me

tests/unit/contracts/graph/test_semantic_manifest.py

@@ -0,0 +1,32 @@
+import pytest
+from dbt.contracts.graph.semantic_manifest import SemanticManifest
+
+# Request fixtures for manifest, this is simialr to import * in the file.
+pytest_plugins = ("tests.unit.utils.manifest",)
+
+# Overwrite the default nods to construct the manifest
+
+
+@pytest.fixture
+def nodes(metricflow_time_spine_model):
+    return [metricflow_time_spine_model]
+
+
+@pytest.fixture
+def semantic_models(
+    semantic_model,
+) -> list:
+    return [semantic_model]
+
+
+@pytest.fixture
+def metrics(
+    metric,
+) -> list:
+    return [metric]
+
+
+class TestSemanticManifest:
+    def test_validate(self, manifest):
+        sm_manifest = SemanticManifest(manifest)
+        assert sm_manifest.validate()