use nightmare for testing

lib/index.js

@@ -20,7 +20,7 @@ function connect_dev() {
 
 	let asset_cache;
 
-	return compose_handlers([
+	const middleware = compose_handlers([
 		require('webpack-hot-middleware')(compilers.client, {
 			reload: true,
 			path: '/__webpack_hmr',
@@ -59,6 +59,13 @@ function connect_dev() {
 
 		get_not_found_handler(() => asset_cache)
 	]);
+
+	middleware.close = () => {
+		watcher.close();
+		// TODO shut down chokidar
+	};
+
+	return middleware;
 }
 
 function connect_prod() {
@@ -67,7 +74,7 @@ function connect_prod() {
 		read_json(path.join(dest, 'stats.server.json'))
 	);
 
-	return compose_handlers([
+	const middleware = compose_handlers([
 		set_req_pathname,
 
 		get_asset_handler({
@@ -95,6 +102,12 @@ function connect_prod() {
 
 		get_not_found_handler(() => asset_cache)
 	]);
+
+	// here for API consistency between dev, and prod, but
+	// doesn't actually need to do anything
+	middleware.close = () => {};
+
+	return middleware;
 }
 
 module.exports = dev ? connect_dev : connect_prod;