diff --git a/dm/tests/_utils/run_downstream_cluster b/dm/tests/_utils/run_downstream_cluster
index 36038c74e07..997fbc6f14a 100755
--- a/dm/tests/_utils/run_downstream_cluster
+++ b/dm/tests/_utils/run_downstream_cluster
@@ -34,7 +34,7 @@ EOF
 		--data-dir "$WORK_DIR/pd" &
 	# wait until PD is online...
 	i=0
-	while ! curl "http://$PD_ADDR/pd/api/v1/version"; do
+	while curl "http://$PD_ADDR/pd/api/v1/version"; do
 		i=$((i + 1))
 		if [ "$i" -gt 20 ]; then
 			echo 'Failed to start PD'
@@ -42,6 +42,7 @@ EOF
 		fi
 		sleep 3
 	done
+	echo 'Start PD success'
 }
 
 start_tikv() {
@@ -54,7 +55,7 @@ start_tikv() {
 		--log-file "$WORK_DIR/tikv.log" \
 		--log-level info \
 		-s "$WORK_DIR/tikv" &
-	while ! curl "http://$PD_ADDR/pd/api/v1/cluster/status" | tee /dev/stderr | grep '"is_initialized": true'; do
+	while curl "http://$PD_ADDR/pd/api/v1/cluster/status" | tee /dev/stderr | grep '"is_initialized": true'; do
 		i=$((i + 1))
 		if [ "$i" -gt 20 ]; then
 			echo 'Failed to initialize TiKV cluster'
@@ -62,6 +63,7 @@ start_tikv() {
 		fi
 		sleep 5
 	done
+	echo 'Start TiKV success'
 }
 
 start_tidb() {
@@ -75,7 +77,7 @@ start_tidb() {
 		--log-file "$WORK_DIR/tidb.log" &
 
 	i=0
-	while ! curl "http://$TIDB_IP:10080/status"; do
+	while curl "http://$TIDB_IP:10080/status"; do
 		i=$((i + 1))
 		if [ "$i" -gt 50 ]; then
 			echo 'Failed to start TiDB'
@@ -83,6 +85,7 @@ start_tidb() {
 		fi
 		sleep 3
 	done
+	echo 'Start TiDB success'
 }
 
 start_pd
diff --git a/dm/tests/many_tables/run.sh b/dm/tests/many_tables/run.sh
index 3fc99f2c4bb..0ffb9a6a680 100644
--- a/dm/tests/many_tables/run.sh
+++ b/dm/tests/many_tables/run.sh
@@ -151,7 +151,9 @@ function run() {
 	pkill -hup tidb-server 2>/dev/null || true
 	wait_process_exit tidb-server
 	# now worker will process some binlog events, save table checkpoint and meet downstream error
+	echo "start incremental_data_2"
 	incremental_data_2
+	echo "finish incremental_data_2"
 	sleep 30
 
 	resume_num=$(grep 'unit process error' $WORK_DIR/worker1/log/dm-worker.log | wc -l)
diff --git a/dm/tests/requirements.txt b/dm/tests/requirements.txt
index f2293605cf1..8ca17f61940 100644
--- a/dm/tests/requirements.txt
+++ b/dm/tests/requirements.txt
@@ -1 +1,2 @@
 requests
+ipaddress
diff --git a/dm/tests/tls/run.sh b/dm/tests/tls/run.sh
index 3fc76387f38..b5046829b78 100644
--- a/dm/tests/tls/run.sh
+++ b/dm/tests/tls/run.sh
@@ -42,8 +42,13 @@ EOF
 		--log-file "$WORK_DIR/tidb.log" 2>&1 &
 
 	sleep 5
+
+	echo "show databases without TLS"
+	mysql -uroot -h127.0.0.1 -P4400 --default-character-set utf8 -E -e "SHOW DATABASES;"
+	echo "drop database tls with TLS"
 	# if execute failed, print tidb's log for debug
 	mysql -uroot -h127.0.0.1 -P4400 --default-character-set utf8 --ssl-ca $cur/conf/ca.pem --ssl-cert $cur/conf/dm.pem --ssl-key $cur/conf/dm.key -E -e "drop database if exists tls" || (cat $WORK_DIR/tidb.log && exit 1)
+	echo "drop database dm_meta with TLS"
 	mysql -uroot -h127.0.0.1 -P4400 --default-character-set utf8 --ssl-ca $cur/conf/ca.pem --ssl-cert $cur/conf/dm.pem --ssl-key $cur/conf/dm.key -E -e "drop database if exists dm_meta"
 }