pitrou commented on a change in pull request #8401:
URL: https://github.com/apache/arrow/pull/8401#discussion_r530191183



##########
File path: rust/arrow-pyarrow-integration-testing/tests/test_sql.py
##########
@@ -0,0 +1,61 @@
+# -*- coding: utf-8 -*-
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+import unittest
+
+import pyarrow
+import arrow_pyarrow_integration_testing
+
+
+class TestCase(unittest.TestCase):
+    def test_primitive_python(self):
+        """
+        Python -> Rust -> Python
+        """
+        old_allocated = pyarrow.total_allocated_bytes()
+        a = pyarrow.array([1, 2, 3])
+        b = arrow_pyarrow_integration_testing.double(a)
+        self.assertEqual(b, pyarrow.array([2, 4, 6]))
+        del a
+        del b
+        # No leak of C++ memory
+        self.assertEqual(old_allocated, pyarrow.total_allocated_bytes())
+
+    def test_primitive_rust(self):
+        """
+        Rust -> Python -> Rust
+        """
+        def double(array):
+            array = array.to_pylist()
+            return pyarrow.array([x * 2 if x is not None else None for x in 
array])
+        
+        is_correct = arrow_pyarrow_integration_testing.double_py(double)
+        self.assertTrue(is_correct)

Review comment:
       Just for the record, you could probably add a `total_allocated_bytes()` 
check in this test too.




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