alamb commented on a change in pull request #307:
URL: https://github.com/apache/arrow-rs/pull/307#discussion_r634779074



##########
File path: parquet/src/arrow/arrow_writer.rs
##########
@@ -1560,4 +1560,21 @@ mod tests {
             panic!("Statistics::Int64 missing")
         }
     }
+
+    #[test]

Review comment:
       I would say this looks more like an "integration" test rather than 
"unit" test (in the sense that you connect some higher level APIs and ensure 
the output is reasonable). I personally don't see any problems with this 
approach. 
   
   to remove the dependency on Arrow you would probably have to use the 
`SerializedFileWriter` API directly: 
https://docs.rs/parquet/4.0.0/parquet/file/writer/trait.FileWriter.html
   
   But I think that would end up being quite a bit more code
   
   




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