Xuanwo commented on code in PR #2644:
URL: 
https://github.com/apache/incubator-opendal/pull/2644#discussion_r1263693651


##########
core/tests/behavior/write.rs:
##########
@@ -1233,3 +1234,31 @@ pub async fn test_fuzz_unsized_writer(op: Operator) -> 
Result<()> {
     op.delete(&path).await.expect("delete must succeed");
     Ok(())
 }
+
+/// seeking a negative position should return a InvalidInput error
+pub async fn test_invalid_reader_seek(op: Operator) -> Result<()> {
+    let path = uuid::Uuid::new_v4().to_string();
+    debug!("Generate a random file: {}", &path);
+    let (content, _) = gen_bytes();
+
+    op.write(&path, content.clone())
+        .await
+        .expect("write must succeed");
+
+    let mut r = op.reader(&path).await?;
+    let res = r.seek(std::io::SeekFrom::Current(-1024)).await;
+
+    assert!(res.is_err());
+
+    // the res should be a std::io::Error, which contains a 
ErrorKind::InvalidInput

Review Comment:
   > It seems not a good idea to map them together.
   
   I think we should implement an internal convert function that convert 
opendal::Error to io::Error (please don't implement `From<std::io::Error> for 
opendal::Error`, we don't want to leak this to user).



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