wiedld commented on code in PR #13866:
URL: https://github.com/apache/datafusion/pull/13866#discussion_r1894526384


##########
datafusion/core/src/datasource/file_format/parquet.rs:
##########
@@ -2335,42 +2347,64 @@ mod tests {
     async fn parquet_sink_write() -> Result<()> {
         let parquet_sink = create_written_parquet_sink("file:///").await?;
 
-        // assert written
-        let mut written = parquet_sink.written();
-        let written = written.drain();
-        assert_eq!(
-            written.len(),
-            1,
-            "expected a single parquet files to be written, instead found {}",
-            written.len()
-        );
+        // assert written to proper path
+        let (path, file_metadata) = get_written(parquet_sink)?;
+        let path_parts = path.parts().collect::<Vec<_>>();
+        assert_eq!(path_parts.len(), 1, "should not have path prefix");

Review Comment:
   I refactored the tests first, into a series of helpers. May be easier to 
review in this commit: 
https://github.com/apache/datafusion/pull/13866/commits/09004c56e6e4b96d3767e03a81f3eb228b3529f1



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