diff --git a/R/pkg/DESCRIPTION b/R/pkg/DESCRIPTION
index 95d3e52bef3a..c8cb1c3a992a 100644
--- a/R/pkg/DESCRIPTION
+++ b/R/pkg/DESCRIPTION
@@ -62,3 +62,4 @@ Collate:
 RoxygenNote: 5.0.1
 VignetteBuilder: knitr
 NeedsCompilation: no
+Encoding: UTF-8
diff --git a/R/pkg/tests/fulltests/test_sparkSQL.R b/R/pkg/tests/fulltests/test_sparkSQL.R
index 23fadc4373c3..c1d277ac84be 100644
--- a/R/pkg/tests/fulltests/test_sparkSQL.R
+++ b/R/pkg/tests/fulltests/test_sparkSQL.R
@@ -496,12 +496,7 @@ test_that("SPARK-17811: can create DataFrame containing NA as date and time", {
   expect_true(is.na(DF$date[2]))
   expect_equal(DF$date[1], as.Date("2016-10-01"))
   expect_true(is.na(DF$time[2]))
-  # Warnings were suppressed due to Jenkins environment issues.
-  # It shows both warnings as below in Jenkins:
-  # - Your system is mis-configured: /etc/localtime is not a symlink
-  # - It is strongly recommended to set environment variable TZ to
-  #     America/Los_Angeles (or equivalent)
-  suppressWarnings(expect_equal(DF$time[1], as.POSIXlt("2016-01-10")))
+  expect_equal(DF$time[1], as.POSIXlt("2016-01-10"))
 })
 
 test_that("create DataFrame with complex types", {
diff --git a/R/run-tests.sh b/R/run-tests.sh
index 782b5f5baeba..51ca7d600caf 100755
--- a/R/run-tests.sh
+++ b/R/run-tests.sh
@@ -31,10 +31,9 @@ NUM_TEST_WARNING="$(grep -c -e 'Warnings ----------------' $LOGFILE)"
 # Also run the documentation tests for CRAN
 CRAN_CHECK_LOG_FILE=$FWDIR/cran-check.out
 rm -f $CRAN_CHECK_LOG_FILE
-# TODO(SPARK-30737) reenable this once packages are correctly installed in Jenkins
-# NO_TESTS=1 NO_MANUAL=1 $FWDIR/check-cran.sh 2>&1 | tee -a $CRAN_CHECK_LOG_FILE
-# FAILED=$((PIPESTATUS[0]||$FAILED))
-touch $CRAN_CHECK_LOG_FILE
+
+NO_TESTS=1 NO_MANUAL=1 $FWDIR/check-cran.sh 2>&1 | tee -a $CRAN_CHECK_LOG_FILE
+FAILED=$((PIPESTATUS[0]||$FAILED))
 
 NUM_CRAN_WARNING="$(grep -c WARNING$ $CRAN_CHECK_LOG_FILE)"
 NUM_CRAN_ERROR="$(grep -c ERROR$ $CRAN_CHECK_LOG_FILE)"