Simple packing: corner case of bpv>0 for a constant field

tests/grib_bitsPerValue.sh

@@ -132,3 +132,12 @@ for bpv in `seq 17 $MAX_BPV`; do
     [ "$stats1" = "$stats2" ]
     rm -f $temp
 done
+
+# Cater for case of constant field with bitsPerValue > 0
+# TODO: This is a crazy case - still not sure if we should cater for it
+#sample2=$ECCODES_SAMPLES_PATH/GRIB2.tmpl
+#${tools_dir}/grib_set -s bitsPerValue=16 $sample2 $temp
+#minmax=`${tools_dir}/grib_get -p min,max $temp`
+#[ "$minmax" = "1 1" ]
+
+rm -f $temp