Add test_cmd_animation.sh

tests/CMakeLists.txt

diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 52f3259..4cdd8f3 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -180,6 +180,9 @@
     add_test(NAME test_cmd COMMAND bash ${CMAKE_CURRENT_SOURCE_DIR}/test_cmd.sh ${CMAKE_BINARY_DIR}
                                    ${CMAKE_CURRENT_SOURCE_DIR}/data
     )
+    add_test(NAME test_cmd_animation COMMAND bash ${CMAKE_CURRENT_SOURCE_DIR}/test_cmd_animation.sh ${CMAKE_BINARY_DIR}
+                                             ${CMAKE_CURRENT_SOURCE_DIR}/data
+    )
     add_test(NAME test_cmd_grid COMMAND bash ${CMAKE_CURRENT_SOURCE_DIR}/test_cmd_grid.sh ${CMAKE_BINARY_DIR}
                                         ${CMAKE_CURRENT_SOURCE_DIR}/data
     )

tests/test_cmd_animation.sh

diff --git a/tests/test_cmd_animation.sh b/tests/test_cmd_animation.sh
new file mode 100644
index 0000000..0ee55d5
--- /dev/null
+++ b/tests/test_cmd_animation.sh
@@ -0,0 +1,73 @@
+#!/bin/bash
+# Copyright 2023 Google LLC
+#
+# 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.
+# ------------------------------------------------------------------------------
+
+set -ex
+
+if [[ "$#" -ge 1 ]]; then
+  BINARY_DIR="$(eval echo "$1")"
+else
+  BINARY_DIR="$(pwd)/.."
+fi
+if [[ "$#" -ge 2 ]]; then
+  TESTDATA_DIR="$(eval echo "$2")"
+else
+  TESTDATA_DIR="$(pwd)/data"
+fi
+if [[ "$#" -ge 3 ]]; then
+  TMP_DIR="$(eval echo "$3")"
+else
+  TMP_DIR="$(mktemp -d)"
+fi
+
+AVIFENC="${BINARY_DIR}/avifenc"
+AVIFDEC="${BINARY_DIR}/avifdec"
+ARE_IMAGES_EQUAL="${BINARY_DIR}/tests/are_images_equal"
+
+# Input file paths.
+INPUT_Y4M_0="${TESTDATA_DIR}/kodim03_yuv420_8bpc.y4m"
+INPUT_Y4M_1="${TESTDATA_DIR}/kodim23_yuv420_8bpc.y4m"
+INPUT_BAD_DIMENSIONS="${TESTDATA_DIR}/paris_exif_xmp_icc.jpg"
+# Output file names.
+ENCODED_FILE="avif_test_cmd_animation_encoded.avif"
+DECODED_FILE="avif_test_cmd_animation_decoded.y4m"
+ERROR_MSG="avif_test_cmd_animation_error_msg.txt"
+
+cleanup() {
+  pushd ${TMP_DIR}
+    rm -- "${ENCODED_FILE}" "${DECODED_FILE}" "${ERROR_MSG}"
+  popd
+}
+trap cleanup EXIT
+
+pushd ${TMP_DIR}
+  # Lossy test.
+  "${AVIFENC}" -s 8 "${INPUT_Y4M_0}" "${INPUT_Y4M_1}" -o "${ENCODED_FILE}"
+  "${AVIFDEC}" "${ENCODED_FILE}" "${DECODED_FILE}"
+  # The are_images_equal binary only reads the first frame of each input file.
+  "${ARE_IMAGES_EQUAL}" "${INPUT_Y4M_0}" "${DECODED_FILE}" 0 && exit 1
+
+  # Lossless test.
+  "${AVIFENC}" -s 8 "${INPUT_Y4M_0}" "${INPUT_Y4M_1}" -q 100 -o "${ENCODED_FILE}"
+  "${AVIFDEC}" "${ENCODED_FILE}" "${DECODED_FILE}"
+  "${ARE_IMAGES_EQUAL}" "${INPUT_Y4M_0}" "${DECODED_FILE}" 0
+
+  # All input frames must have the same size.
+  "${AVIFENC}" "${INPUT_Y4M_0}" "${INPUT_BAD_DIMENSIONS}" -o "${ENCODED_FILE}" \
+    2> "${ERROR_MSG}" && exit 1
+  grep "dimensions mismatch" "${ERROR_MSG}"
+popd
+
+exit 0