Will docker cp overwrite stuff on the destination as expected?

sanity-test-docker-cp.sh

#!/usr/bin/env bash

for test in "bare file" "directory"; do
  prefix=""
  container_path="/foo"
  if [ "$test" = "directory" ]; then
    mkdir -p "/tmp/foodir"
    prefix="/foodir"
    container_path="/foodir"
  fi

  echo "foo" > "/tmp${prefix}/foo"
  original_content=$(cat "/tmp${prefix}/foo")

  docker rm -f cp-sanity-test 2>/dev/null >/dev/null
  docker create --name cp-sanity-test busybox:latest sleep infinity
  docker cp "/tmp${container_path}" cp-sanity-test:$container_path

  docker start cp-sanity-test >/dev/null
  docker exec cp-sanity-test sh -c "echo 'bar' > ${prefix}/foo"
  docker cp cp-sanity-test:$container_path "/tmp${container_path}"

  output=" ✅"
  [ "$(cat "/tmp${prefix}/foo")" = "foo" ] && output=" NOT ❌"
  echo "\`docker cp\` DOES$output overwrite a $test"
  echo "Original content: $original_content"
  echo " Current content: $(cat "/tmp${prefix}/foo")"
  echo "Expected content: $(docker exec cp-sanity-test cat ${prefix}/foo)"

  docker kill  cp-sanity-test >/dev/null
  docker rm -f cp-sanity-test 2>/dev/null >/dev/null
  rm -rf "/tmp${container_path}"
done