rkrishn7 commented on code in PR #14520:
URL: https://github.com/apache/datafusion/pull/14520#discussion_r1943795899


##########
datafusion/common/src/config.rs:
##########
@@ -2093,3 +2094,22 @@ mod tests {
         assert_eq!(parsed_metadata.get("key_dupe"), Some(&Some("B".into())));
     }
 }
+
+#[cfg(test)]
+mod tests_isolated {
+    // The point of this test is to check that the config_namespace! macro
+    // can compile without any surrounding `use` statements. Hence putting
+    // it into its own test module.
+    #[test]
+    fn check_config_namespace_macro() {

Review Comment:
   Do you think it may be better to add this test/module in `lib.rs` 🤔 ?
   
   Since the subtle addition of a `use super::*` in the future would 
effectively hide any regression here.



##########
datafusion/common/src/config.rs:
##########
@@ -2093,3 +2094,22 @@ mod tests {
         assert_eq!(parsed_metadata.get("key_dupe"), Some(&Some("B".into())));
     }
 }
+
+#[cfg(test)]
+mod tests_isolated {

Review Comment:
   ```suggestion
   mod tests {
   ```
   
   I think it may be best to stick to 
[convention](https://doc.rust-lang.org/book/ch11-03-test-organization.html#unit-tests)
 here.



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