Implement postgres:clone command

tests/service_clone.bats

@@ -0,0 +1,42 @@
+#!/usr/bin/env bats
+load test_helper
+
+setup() {
+  export ECHO_DOCKER_COMMAND="false"
+  dokku "$PLUGIN_COMMAND_PREFIX:create" l >&2
+}
+
+teardown() {
+  export ECHO_DOCKER_COMMAND="false"
+  dokku --force "$PLUGIN_COMMAND_PREFIX:destroy" l >&2
+}
+
+@test "($PLUGIN_COMMAND_PREFIX:clone) error when there are no arguments" {
+  run dokku "$PLUGIN_COMMAND_PREFIX:clone"
+  assert_contains "${lines[*]}" "Please specify a name for the service"
+}
+
+@test "($PLUGIN_COMMAND_PREFIX:clone) error when service does not exist" {
+  run dokku "$PLUGIN_COMMAND_PREFIX:clone" not_existing_service new_service
+  assert_contains "${lines[*]}" "service not_existing_service does not exist"
+}
+
+@test "($PLUGIN_COMMAND_PREFIX:clone) error when new service isn't provided" {
+  run dokku "$PLUGIN_COMMAND_PREFIX:clone" l
+  assert_contains "${lines[*]}" "Please specify a name for the new service"
+}
+
+@test "($PLUGIN_COMMAND_PREFIX:clone) error when new service already exists" {
+  dokku "$PLUGIN_COMMAND_PREFIX:create" new_service
+  run dokku "$PLUGIN_COMMAND_PREFIX:clone" l new_service
+  assert_contains "${lines[*]}" "service new_service already exists"
+  dokku --force "$PLUGIN_COMMAND_PREFIX:destroy" new_service
+}
+
+@test "($PLUGIN_COMMAND_PREFIX:clone) success" {
+  run dokku "$PLUGIN_COMMAND_PREFIX:clone" l new_service
+  [[ -f $PLUGIN_DATA_ROOT/new_service/ID ]]
+  assert_contains "${lines[*]}" "Copying data from l to new_service"
+  assert_contains "${lines[*]}" "Done"
+}
+