diff --git a/test/simulation/106-refclock b/test/simulation/106-refclock
index ee1fd66..0154fdb 100755
--- a/test/simulation/106-refclock
+++ b/test/simulation/106-refclock
@@ -16,7 +16,9 @@ chronyc_start=70
 chronyc_conf="tracking"
 
 for refclock in "SHM 0" "PHC /dev/ptp0"; do
-	client_conf="refclock $refclock stratum 3 delay 1e-3 refid GPS"
+	client_conf="refclock $refclock stratum 3 delay 1e-3 refid GPS
+logdir tmp
+log refclocks"
 
 	run_test || test_fail
 	check_chronyd_exit || test_fail
@@ -29,6 +31,34 @@ Root delay      : 0.001000000 seconds
 .*
 Update interval : 16\.. seconds
 .*$" || test_fail
+
+	check_file_messages "20.* GPS.*[0-9] N " 997 1001 refclocks.log || test_fail
+	check_file_messages "20.* GPS.*- N " 61 63 refclocks.log || test_fail
+	rm -f tmp/refclocks.log
 done
 
+if check_config_h 'FEAT_PPS 1'; then
+	refclock_offset=0.35
+	refclock_jitter=0.05
+	client_conf="
+refclock SHM 0 refid NMEA noselect
+refclock PPS /dev/pps0 lock NMEA
+logdir tmp
+log refclocks"
+
+	run_test || test_fail
+	check_chronyd_exit || test_fail
+	check_source_selection || test_fail
+	check_sync || test_fail
+	check_chronyc_output "^Reference ID.*50505331 \(PPS1\)
+Stratum.*: 1
+.*
+Root delay      : 0\.000000001 seconds
+.*$" || test_fail
+
+	check_file_messages "20.* PPS1.*[0-9] N " 620 740 refclocks.log || test_fail
+	check_file_messages "20.* PPS1.*- N " 60 63 refclocks.log || test_fail
+	rm -f tmp/refclocks.log
+fi
+
 test_pass