Added unittest

Signed-off-by: gcunhase <4861122+gcunhase@users.noreply.github.com>

Author: gcunhase

tests/unit/onnx/autocast/test_precisionconverter.py

@@ -1023,3 +1023,81 @@ def test_constant_cast_folding(model_with_constant_cast_patterns, low_precision_
     assert utils.get_consumer_nodes(converted_model, "const_scalar")[0].op_type == "Add"
     assert len(utils.get_consumer_nodes(converted_model, "const_array")) == 1
     assert utils.get_consumer_nodes(converted_model, "const_array")[0].op_type == "Add"
+
+
+@pytest.fixture
+def model_with_multiple_output_node_casted_to_output():
+    """Create a model with a Cast node connecting a consumer with multiple outputs to a graph output."""
+    # Create inputs and outputs
+    x1 = helper.make_tensor_value_info("X1", TensorProto.FLOAT, [1, 2, 16, 16])
+    x2 = helper.make_tensor_value_info("X2", TensorProto.FLOAT, [1, 3, 16, 16])
+    x3 = helper.make_tensor_value_info("X3", TensorProto.FLOAT, [1, 4, 16, 16])
+    y1 = helper.make_tensor_value_info("Y1", TensorProto.FLOAT, [1, 5, 16, 16])
+    y2 = helper.make_tensor_value_info("Y2", TensorProto.FLOAT, [1, 9, 16, 16])
+
+    # Create computation nodes
+    concat_1_node = helper.make_node(
+        "Concat",
+        ["X1", "X2"],
+        ["concat_1_out"],
+        name="concat_1",
+        axis=1,
+    )
+    concat_2_node = helper.make_node(
+        "Concat",
+        ["concat_1_out", "X3"],
+        ["Y2"],
+        name="concat_2",
+        axis=1,
+    )
+
+    # Create a Cast node between 'concat_1' and the graph output
+    cast_node = helper.make_node(
+        "Cast",
+        ["concat_1_out"],
+        ["Y1"],
+        name="cast_0",
+        to=TensorProto.FLOAT,
+    )
+
+    graph = helper.make_graph(
+        [concat_1_node, concat_2_node, cast_node],
+        "model_with_multiple_output_node_casted_to_output",
+        [x1, x2, x3],
+        [y1, y2],
+        [],
+    )
+
+    model = helper.make_model(
+        graph, producer_name="model_with_multiple_output_node_casted_to_output"
+    )
+    model.opset_import[0].version = 20
+    model.ir_version = 10
+    onnx.checker.check_model(model)
+
+    model = onnx_utils.infer_shapes(model)
+    value_info_map, initializer_map, node_to_init_map = utils.setup_mappings(model)
+
+    return model, value_info_map, initializer_map, node_to_init_map
+
+
+@pytest.mark.parametrize("low_precision_type", ["fp16", "bf16"])
+def test_multiple_output_node_casted_to_output(
+    model_with_multiple_output_node_casted_to_output, low_precision_type
+):
+    model, value_info_map, initializer_map, node_to_init_map = (
+        model_with_multiple_output_node_casted_to_output
+    )
+
+    converter = PrecisionConverter(
+        model,
+        value_info_map,
+        initializer_map,
+        node_to_init_map,
+        keep_io_types=True,
+        low_precision_type=low_precision_type,
+    )
+    converted_model = converter.convert(
+        high_precision_nodes=[], low_precision_nodes=["concat_1", "concat_2"]
+    )
+    onnx.checker.check_model(converted_model)