[PATCH v2 04/21] libtracefs: Add unit test to test tracefs_sql() compare

@@ -50,6 +50,9 @@
 #define SQL_2_EVENT	"wakeup_2"
 #define SQL_2_SQL	"select woke.next_pid as woke_pid, wake.common_pid as waking_pid from sched_waking as wake join sched_switch as woke on woke.next_pid = wake.pid"
 
+#define SQL_3_EVENT	"wakeup_lat"
+#define SQL_3_SQL	"select start.pid, end.next_prio as prio, (end.TIMESTAMP_USECS - start.TIMESTAMP_USECS) as lat from sched_waking as start join sched_switch as end on start.pid = end.next_pid"
+
 static struct tracefs_instance *test_instance;
 static struct tep_handle *test_tep;
 struct test_sample {

@@ -354,6 +357,13 @@ static void test_instance_trace_sql(struct tracefs_instance *instance)
 	tracefs_synth_free(synth);
 	trace_seq_reset(&seq);
 
+	synth = tracefs_sql(tep, SQL_3_EVENT, SQL_3_SQL, NULL);
+	CU_TEST(synth != NULL);
+	ret = tracefs_synth_show(&seq, instance, synth);
+	CU_TEST(ret == 0);
+	tracefs_synth_free(synth);
+	trace_seq_reset(&seq);
+
 	tep_free(tep);
 	trace_seq_destroy(&seq);
 }