in_udp: test: Add test cases

Signed-off-by: Hiroshi Hatake <hatake@calyptia.com>

Author: cosmo0920

tests/runtime/CMakeLists.txt

@@ -51,6 +51,7 @@ if(FLB_OUT_LIB)
   FLB_RT_TEST(FLB_IN_SPLUNK        "in_splunk.c")
   FLB_RT_TEST(FLB_IN_SYSLOG        "in_syslog.c")
   FLB_RT_TEST(FLB_IN_TAIL          "in_tail.c")
+  FLB_RT_TEST(FLB_IN_UDP           "in_udp.c")
   FLB_RT_TEST(FLB_IN_TCP          "in_tcp.c")
   FLB_RT_TEST(FLB_IN_FORWARD       "in_forward.c")
   FLB_RT_TEST(FLB_IN_FLUENTBIT_METRICS "in_fluentbit_metrics.c")