diff --git a/sample_images/generate_payloads.sh b/sample_images/generate_payloads.sh
new file mode 100755
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+++ b/sample_images/generate_payloads.sh
@@ -0,0 +1,51 @@
+#!/bin/bash
+#
+# Copyright (C) 2020 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+# This script generates some sample payloads from the images in
+# sample_images.tar.bz2. and packages them in the sample_payloads.tar.xz file.
+# The payloads are then used in paycheck_unittests.py. The file names
+# must match the ones used in update_payload ebuild and paycheck_unittests.py.
+
+set -e
+
+TEMP_IMG_DIR=./sample_images
+OLD_KERNEL="${TEMP_IMG_DIR}/disk_ext2_4k_empty.img"
+OLD_ROOT="${TEMP_IMG_DIR}/disk_sqfs_empty.img"
+NEW_KERNEL="${TEMP_IMG_DIR}/disk_ext2_4k.img"
+NEW_ROOT="${TEMP_IMG_DIR}/disk_sqfs_default.img"
+
+
+mkdir -p "${TEMP_IMG_DIR}"
+tar -xvf sample_images.tar.bz2 -C "${TEMP_IMG_DIR}"
+
+echo "Generating full payload"
+delta_generator --out_file=full_payload.bin \
+                --partition_names=kernel:root \
+                --new_partitions="${NEW_KERNEL}":"${NEW_ROOT}"
+
+echo "Generating delta payload"
+delta_generator --out_file=delta_payload.bin \
+                --partition_names=kernel:root \
+                --new_partitions="${NEW_KERNEL}":"${NEW_ROOT}" \
+                --old_partitions="${OLD_KERNEL}":"${OLD_ROOT}" --minor_version=6
+
+echo "Creating sample_payloads.tar"
+tar -cJf sample_payloads.tar.xz {delta,full}_payload.bin
+
+rm -rf "${TEMP_IMG_DIR}" {delta,full}_payload.bin
+
+echo "Done"
diff --git a/sample_images/sample_payloads.tar.xz b/sample_images/sample_payloads.tar.xz
new file mode 100644
index 0000000..d0bf6d9
--- /dev/null
+++ b/sample_images/sample_payloads.tar.xz
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