ianmcook commented on a change in pull request #9999:
URL: https://github.com/apache/arrow/pull/9999#discussion_r624245151
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File path: r/tests/testthat/test-dplyr-mutate.R
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@@ -15,6 +15,21 @@
# specific language governing permissions and limitations
# under the License.
+# because expect_dplyr_equal involves no assertion (wrong initial thought)
+# we need to "translate" dplyr tests as:
Review comment:
```suggestion
# developer note:
# when adapting tests from the dplyr package, note that expect_dplyr_equal()
# works differently from expect_equal(). the first argument is a dplyr
# expression containing the placeholder `input`, and the second argument
# is the R data frame to pass in as that input. So for example, adapt a test
# from dplyr as follows:
```
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