Add bats test for generate jails with different times

test/generate.bats

@@ -0,0 +1,11 @@
+#!/usr/bin/env bats
+
+@test "generate" {
+    jails="test0 test1 test2 test3 test4 test5"
+    for jail in ${jails}; do
+        bkctld init "${jail}"
+        random=$(od -An -N4 -i < /dev/urandom|grep -Eo "[0-9]{2}$")
+        date=$(date -d "${random} hour ago")
+        touch -m --date="${date}" "/backup/jails/${jail}/var/log/lastlog"
+    done
+}