Jefffrey commented on code in PR #18851:
URL: https://github.com/apache/datafusion/pull/18851#discussion_r2548256791


##########
docs/source/contributor-guide/testing.md:
##########
@@ -46,19 +46,40 @@ cargo nextest run
 ## Unit tests
 
 Tests for code in an individual module are defined in the same source file 
with a `test` module, following Rust convention.
-The 
[test_util](https://github.com/apache/datafusion/tree/main/datafusion/common/src/test_util.rs)
 module provides useful macros to write unit tests effectively, such as 
`assert_batches_sorted_eq` and `assert_batches_eq` for RecordBatches and 
`assert_contains` / `assert_not_contains` which are used extensively in the 
codebase.
+
+For example, to run tests in the `datafusion` crate:
+
+```shell
+cargo test -p datafusion
+```
+
+The 
[test_util](https://github.com/apache/datafusion/tree/main/datafusion/common/src/test_util.rs)
 module provides useful macros to write unit tests effectively, such as 
[`assert_batches_sorted_eq`] and [`assert_batches_eq`] for RecordBatches and 
[`assert_contains`] / [`assert_not_contains`] which are used extensively in the 
codebase.

Review Comment:
   ```suggestion
   The [test_util] module provides useful macros to write unit tests 
effectively, such as [`assert_batches_sorted_eq`] and [`assert_batches_eq`] for 
RecordBatches and [`assert_contains`] / [`assert_not_contains`] which are used 
extensively in the codebase.
   ```



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