[test] add nanosecond timestamp test for generic_log

Author: Yukigaru

test/Makefile.am

@@ -364,6 +364,7 @@ dist_noinst_DATA = \
 	logfile_generic.1 \
 	logfile_generic.2 \
 	logfile_generic.3 \
+	logfile_generic_nanos.0 \
 	logfile_generic_with_header.0 \
 	logfile_glog.0 \
 	logfile_grafana.0 \

test/logfile_generic_nanos.0

@@ -0,0 +1,2 @@
+2025-01-01 00:00:00.123456789:INFO:nano first
+2025-01-01 01:00:00.987654321:WARN:nano second

test/test_logfile.sh

@@ -548,6 +548,13 @@ Jul 02 10:22:40 2012 -- 672
 Oct 08 16:56:38 2014 -- 344
 EOF
 
+run_test ./drive_logfile -t -f generic_log ${srcdir}/logfile_generic_nanos.0
+
+check_output "generic_log nanosecond timestamp not parsed?" <<EOF
+Jan 01 00:00:00 2025 -- 123
+Jan 01 01:00:00 2025 -- 987
+EOF
+
 run_test ./drive_logfile -v -f generic_log ${srcdir}/logfile_generic.0
 
 check_output "generic_log level interpreted incorrectly?" <<EOF