nealrichardson commented on a change in pull request #11250:
URL: https://github.com/apache/arrow/pull/11250#discussion_r717051281



##########
File path: r/tests/testthat/test-dplyr-string-functions.R
##########
@@ -806,26 +806,49 @@ test_that("format_ISO8601", {
     times
   )
 
-  expect_dplyr_equal(
-    input %>%
-      mutate(x = format_ISO8601(x, precision = "ymd", usetz = TRUE)) %>%
-      collect(),
-    times
-  )
+  if (getRversion() < "3.5") {
+    # before 3.5, times$x will have no timezone attribute, so Arrow faithfully
+    # errors that there is no timezone to format:
+    expect_error(
+      times %>%
+        Table$create() %>%
+        mutate(x = format_ISO8601(x, precision = "ymd", usetz = TRUE)) %>%
+        collect(),
+      "Timezone not present, cannot convert to string with timezone: 
%Y-%m-%d%z"
+    )
+
+    # See comment regarding %S flag in strftime tests
+    expect_error(
+      times %>%
+        Table$create() %>%
+        mutate(x = format_ISO8601(x, precision = "ymdhms", usetz = TRUE)) %>%
+        mutate(x = gsub("\\.0*", "", x)) %>%
+        collect(),
+      "Timezone not present, cannot convert to string with timezone: 
%Y-%m-%dT%H:%M:%S%z"
+    )
+  } else {
+    expect_dplyr_equal(
+      input %>%
+        mutate(x = format_ISO8601(x, precision = "ymd", usetz = TRUE)) %>%
+        collect(),
+      times
+    )
+
+    # See comment regarding %S flag in strftime tests
+    expect_dplyr_equal(
+      input %>%
+        mutate(x = format_ISO8601(x, precision = "ymdhms", usetz = TRUE)) %>%
+        mutate(x = gsub("\\.0*", "", x)) %>%
+        collect(),
+      times
+    )
+  }
 
-  # See comment regarding %S flag in strftime tests
-  expect_dplyr_equal(
-    input %>%
-      mutate(x = format_ISO8601(x, precision = "ymdhms", usetz = FALSE)) %>%
-      mutate(x = gsub("\\.0*", "", x)) %>%
-      collect(),
-    times
-  )
 
   # See comment regarding %S flag in strftime tests
   expect_dplyr_equal(
     input %>%
-      mutate(x = format_ISO8601(x, precision = "ymdhms", usetz = TRUE)) %>%
+      mutate(x = format_ISO8601(x, precision = "ymdhms", usetz = FALSE)) %>%

Review comment:
       I don't see usetz = FALSE in the green if/else above, they all say TRUE, 
am I missing something?




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