Use pio_write_run also for 2d-decomposed test.

tests/pio_write_deco2d_run.in

@@ -4,15 +4,8 @@ LOG="${LOG-pio_write_deco2d.log}"
 if [ @ENABLE_GRIB@ = yes ]; then
   mpi_task_num="${mpi_task_num-6}"
   suffix="${suffix-grb}"
-  exec 5>&1 6>&2 >"$LOG" 2>&1
-  ../libtool --mode=execute @MPI_LAUNCH@ -n ${mpi_task_num} \
-    ${tool_wrap} ./pio_write_deco2d ${pio_write_args}
-  exec 2>&6 1>&5 5>&- 6>&-
-  ../libtool --mode=execute \
-    ${tool_wrap} ./cksum_read example_0.${suffix} example_0.cksum
-  ../libtool --mode=execute \
-    ${tool_wrap} ./cksum_read example_1.${suffix} example_1.cksum
-  \rm "$LOG"
+  pio_write=./pio_write_deco2d
+  . ./pio_write_run
 else
   # skip tests for unsupported formats
   exit 77

tests/pio_write_run.in

 #! @SHELL@
 set -e
 LOG=${LOG-pio_write.log}
-if [ @ENABLE_GRIB@ != yes ]; then
-  # skip tests for unsupported formats
-  exit 77
-fi
 mpi_task_num=${mpi_task_num-4}
 prefix=${CDI_TEST_PREFIX-example}
 suffix=${suffix-grb}
+pio_write=${pio_write-./pio_write}
+case $suffix in
+  grb)
+    if [ @ENABLE_GRIB@ != yes ]; then
+      # skip tests for unsupported formats
+      exit 77
+    fi
+    ;;
+esac
 if [ "@USE_MPI@" = yes ]; then
   variations="-qno-batch-rma -qcache-redists -qcreate-curvilinear-grid -qpreset-decomposition=true"
 else
@@ -23,7 +28,7 @@ test_variation()
   variation=$1
   ../libtool --mode=execute \
     @MPI_LAUNCH@ \
-    -n ${mpi_task_num} ${tool_wrap} ./pio_write ${pio_write_args} -s 7 \
+    -n ${mpi_task_num} ${tool_wrap} ${pio_write} ${pio_write_args} -s 7 \
     ${variation} ${CDI_TEST_PREFIX+"-qprefix=${CDI_TEST_PREFIX}"}
   echo "checking ${prefix}_0.$suffix" >&2
   ../libtool --mode=execute \