pitrou commented on code in PR #14583:
URL: https://github.com/apache/arrow/pull/14583#discussion_r1017819803


##########
python/pyarrow/tests/test_ipc.py:
##########
@@ -1153,9 +1153,17 @@ def make_batches():
     batches = iter(UserList(make_batches()))  # weakrefable
     wr = weakref.ref(batches)
 
-    with pa.ipc.RecordBatchReader.from_batches(make_schema(),
-                                               batches) as reader:
+    with pa.RecordBatchReader.from_batches(make_schema(),
+                                           batches) as reader:
         batches = None
         assert wr() is not None
         assert list(reader) == make_batches()
         assert wr() is None
+
+    # ensure we get proper error when not passing a schema
+    # (https://issues.apache.org/jira/browse/ARROW-18229)
+    batches = make_batches()
+    with pytest.raises(TypeError):
+        reader = pa.RecordBatchReader.from_batches(
+            [('field', pa.int64())], batches)
+        str(reader.schema)

Review Comment:
   The problem is that the test might succeed now if `from_batches` succeeds 
but `str` raises. So we should remove this  `str` call, IMHO.



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