fix dockerproxy test

src/dockerproxy.js

@@ -73,7 +73,9 @@ async function containersCreate(req, res, next) {
 
     debug('containersCreate: original bind mounts:', req.body.HostConfig.Binds);
 
-    const result = await volumes.list();
+    const [error, result] = await safe(volumes.list());
+    if (error) return next(new HttpError(500, `Error listing volumes: ${error.message}`));
+
     const volumesByName = {};
     result.forEach(r => volumesByName[r.name] = r);
 
@@ -146,8 +148,6 @@ async function start() {
     // Overwrite the default 2min request timeout. This is required for large builds for example
     gHttpServer.setTimeout(60 * 60 * 1000);
 
-    debug(`startDockerProxy: started proxy on port ${constants.DOCKER_PROXY_PORT}`);
-
     // eslint-disable-next-line no-unused-vars
     gHttpServer.on('upgrade', function (req, client, head) {
         // Create a new tcp connection to the TCP server
@@ -176,6 +176,7 @@ async function start() {
         });
     });
 
+    debug(`start: listening on 172.18.0.1:${constants.DOCKER_PROXY_PORT}`);
     await util.promisify(gHttpServer.listen.bind(gHttpServer))(constants.DOCKER_PROXY_PORT, '172.18.0.1');
 }