Adding missing test

build_image

 #!/bin/bash
 
 # Copyright (c) 2009 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Script to build a bootable keyfob-based chromeos system image from within
 # a chromiumos setup. This assumes that all needed packages have been built into
 # the given target's root with binary packages turned on. This script will
 # build the Chrome OS image using only pre-built binary packages.
@@ skipping 700 matching lines @@
   # Pre-set "sucessful" bit in gpt, so we will never mark-for-death
   # a partition on an SDCard/USB stick.
   ${GPT} add -i 2 -S 1 "${OUTPUT_DIR}/${image_name}"
 
   trap - EXIT
 }
 
 generate_au_zip () {
   local lgenerateauzip="${SCRIPTS_DIR}/generate_au_zip.py"
   local largs="-o ${OUTPUT_DIR}"
-  ! -d "${OUTPUT_DIR}" && mkdir -p "${OUTPUT_DIR}"
+  test ! -d "${OUTPUT_DIR}" && mkdir -p "${OUTPUT_DIR}"
   info "Running ${lgenerateauzip} ${largs} for generating AU updater zip file"
   $lgenerateauzip $largs
 }
 
 # Create the output directory.
 mkdir -p "${OUTPUT_DIR}"
 mkdir -p "${ROOT_FS_DIR}"
 mkdir -p "${STATEFUL_FS_DIR}"
 mkdir -p "${OEM_FS_DIR}"
 mkdir -p "${ESP_FS_DIR}"
@@ skipping 83 matching lines @@
   echo "Developer image created as ${DEVELOPER_IMAGE_NAME}"
 fi
 
 print_time_elapsed
 
 echo "To copy to USB keyfob, do something like:"
 echo "  ./image_to_usb.sh --from=${OUTSIDE_OUTPUT_DIR} --to=/dev/sdX"
 echo "To convert to VMWare image, INSIDE the chroot, do something like:"
 echo "  ./image_to_vm.sh --from=${OUTSIDE_OUTPUT_DIR} --board=${BOARD}"
 echo "from the scripts directory where you entered the chroot."