add testing scripts for protobuf javascript on aarch64 qemu emulator
diff --git a/kokoro/linux/aarch64/javascript_build_and_run_tests_with_qemu_aarch64.sh b/kokoro/linux/aarch64/javascript_build_and_run_tests_with_qemu_aarch64.sh
new file mode 100755
index 0000000..e5d07e8
--- /dev/null
+++ b/kokoro/linux/aarch64/javascript_build_and_run_tests_with_qemu_aarch64.sh
@@ -0,0 +1,10 @@
+#!/bin/bash
+
+set -ex
+
+# go to the repo root
+cd $(dirname $0)/../../..
+
+cd js
+npm install
+npm test
diff --git a/kokoro/linux/aarch64/test_javascript_aarch64.sh b/kokoro/linux/aarch64/test_javascript_aarch64.sh
new file mode 100755
index 0000000..dcddd60
--- /dev/null
+++ b/kokoro/linux/aarch64/test_javascript_aarch64.sh
@@ -0,0 +1,26 @@
+#!/bin/bash
+
+set -ex
+
+# go to the repo root
+cd $(dirname $0)/../../..
+
+if [[ -t 0 ]]; then
+ DOCKER_TTY_ARGS="-it"
+else
+ # The input device on kokoro is not a TTY, so -it does not work.
+ DOCKER_TTY_ARGS=
+fi
+
+# crosscompile protoc as we will later need it for the javascript build.
+# we build it under the dockcross/manylinux2014-aarch64 image so that the resulting protoc binary is compatible
+# with a wide range of linux distros (including any docker images we will use later to build and test javascript)
+kokoro/linux/aarch64/dockcross_helpers/run_dockcross_manylinux2014_aarch64.sh kokoro/linux/aarch64/protoc_crosscompile_aarch64.sh
+
+# use an actual aarch64 docker image (with a real aarch64 nodejs) to run build & test protobuf javascript under an emulator
+# * mount the protobuf root as /work to be able to access the crosscompiled files
+# * to avoid running the process inside docker as root (which can pollute the workspace with files owned by root), we force
+# running under current user's UID and GID. To be able to do that, we need to provide a home directory for the user
+# otherwise the UID would be homeless under the docker container and pip install wouldn't work. For simplicity,
+# we just run map the user's home to a throwaway temporary directory
+docker run $DOCKER_TTY_ARGS --rm --user "$(id -u):$(id -g)" -e "HOME=/home/fake-user" -v "$(mktemp -d):/home/fake-user" -v "$(pwd)":/work -w /work arm64v8/node:16-buster kokoro/linux/aarch64/javascript_build_and_run_tests_with_qemu_aarch64.sh
