[Test] add test_give_unique_node_names

tests/test_general_transformation.py

+import hashlib
+import os
+import shutil
+
+import wget
+
+import finn.transformation.general as tg
+from finn.core.modelwrapper import ModelWrapper
+
+mnist_onnx_url_base = "https://onnxzoo.blob.core.windows.net/models/opset_8/mnist"
+mnist_onnx_filename = "mnist.tar.gz"
+mnist_onnx_local_dir = "/tmp/mnist_onnx"
+
+
+def test_give_unique_node_names():
+    try:
+        os.remove("/tmp/" + mnist_onnx_filename)
+    except OSError:
+        pass
+    dl_ret = wget.download(mnist_onnx_url_base + "/" + mnist_onnx_filename, out="/tmp")
+    shutil.unpack_archive(dl_ret, mnist_onnx_local_dir)
+    with open(mnist_onnx_local_dir + "/mnist/model.onnx", "rb") as f:
+        assert hashlib.md5(f.read()).hexdigest() == "d7cd24a0a76cd492f31065301d468c3d"
+    model = ModelWrapper(mnist_onnx_local_dir + "/mnist/model.onnx")
+    model = model.transform_single(tg.give_unique_node_names)
+    assert model.graph.node[0].name == "Reshape_0"
+    assert model.graph.node[1].name == "Conv_1"
+    assert model.graph.node[11].name == "Add_11"
+    # remove the downloaded model and extracted files
+    os.remove(dl_ret)
+    shutil.rmtree(mnist_onnx_local_dir)