feat: API for semantic layers

tests/unit_tests/commands/semantic_layer/exceptions_test.py

@@ -16,6 +16,12 @@
 # under the License.
 
 from superset.commands.semantic_layer.exceptions import (
+    SemanticLayerCreateFailedError,
+    SemanticLayerDeleteFailedError,
+    SemanticLayerForbiddenError,
+    SemanticLayerInvalidError,
+    SemanticLayerNotFoundError,
+    SemanticLayerUpdateFailedError,
     SemanticViewForbiddenError,
     SemanticViewInvalidError,
     SemanticViewNotFoundError,
@@ -46,3 +52,40 @@ def test_semantic_view_update_failed_error() -> None:
     """Test SemanticViewUpdateFailedError has correct message."""
     error = SemanticViewUpdateFailedError()
     assert str(error.message) == "Semantic view could not be updated."
+
+
+def test_semantic_layer_not_found_error() -> None:
+    """Test SemanticLayerNotFoundError has correct status and message."""
+    error = SemanticLayerNotFoundError()
+    assert error.status == 404
+    assert str(error.message) == "Semantic layer does not exist"
+
+
+def test_semantic_layer_forbidden_error() -> None:
+    """Test SemanticLayerForbiddenError has correct message."""
+    error = SemanticLayerForbiddenError()
+    assert str(error.message) == "Changing this semantic layer is forbidden"
+
+
+def test_semantic_layer_invalid_error() -> None:
+    """Test SemanticLayerInvalidError has correct message."""
+    error = SemanticLayerInvalidError()
+    assert str(error.message) == "Semantic layer parameters are invalid."
+
+
+def test_semantic_layer_create_failed_error() -> None:
+    """Test SemanticLayerCreateFailedError has correct message."""
+    error = SemanticLayerCreateFailedError()
+    assert str(error.message) == "Semantic layer could not be created."
+
+
+def test_semantic_layer_update_failed_error() -> None:
+    """Test SemanticLayerUpdateFailedError has correct message."""
+    error = SemanticLayerUpdateFailedError()
+    assert str(error.message) == "Semantic layer could not be updated."
+
+
+def test_semantic_layer_delete_failed_error() -> None:
+    """Test SemanticLayerDeleteFailedError has correct message."""
+    error = SemanticLayerDeleteFailedError()
+    assert str(error.message) == "Semantic layer could not be deleted."