Test collect.sh. Use --run-time instead of --interval for collect loop. Fix and require per-test test names in util/test-bash-functions. Fix OPT_ERR in parse_options.sh.

lib/bash/collect.sh

@@ -160,7 +160,7 @@ collect() {
    # This loop gathers data for the rest of the duration, and defines the time
    # of the whole job.
    echo "Loop start: $(date +'TS %s.%N %F %T')"
-   for a in $(_seq $OPT_INTERVAL); do
+   for a in $(_seq $OPT_RUN_TIME); do
       # We check the disk, but don't exit, because we need to stop jobs if we
       # need to exit.
       disk_space $d > $d/$p-disk-space

lib/bash/parse_options.sh

@@ -28,7 +28,7 @@ set -u
 # sub will be scoped locally.
 declare -a ARGV   # non-option args (probably input files)
 declare EXT_ARGV  # everything after -- (args for an external command)
-OPT_ERR=${OPT_ERR:""}
+OPT_ERR=${OPT_ERR:-""}
 
 # Sub: usage
 #   Print usage (--help) and list the program's options.