add import integration test

Signed-off-by: Xian Chaobo <xianchaobo@huawei.com>

test/integration/api/import.bats

@@ -7,7 +7,37 @@ function teardown() {
 	stop_docker
 }
 
-# FIXME
 @test "docker import" {
-	skip
+	start_docker_with_busybox 2
+	swarm_manage
+	# run a container to export
+	docker_swarm run -d --name test_container busybox sleep 500
+
+	temp_file_name=$(mktemp)
+	# make sure container exists
+	run docker_swarm ps -l
+	[ "${#lines[@]}" -eq 2 ]
+	[[ "${lines[1]}" == *"test_container"* ]]
+
+	# export, container->tar
+	docker_swarm export test_container > $temp_file_name
+
+	# verify: exported file exists, not empty and is tar file
+	[ -s $temp_file_name ]
+	run file $temp_file_name
+	[ "$status" -eq 0 ]
+	[[ "$output" == *"tar archive"* ]]
+
+	# import
+	docker_swarm import - testbusybox < $temp_file_name
+
+	# verify on the nodes
+	for host in ${HOSTS[@]}; do
+		run docker -H $host images
+		[ "$status" -eq 0 ]
+		[[ "${output}" == *"testbusybox"* ]]
+	done
+	
+	# after ok, delete exported tar file
+	rm -f $temp_file_name
 }