fix: callback middlewares do not support validations

Author: leartgjoni-voiceflow

lib/fixtureGenerator.js

@@ -17,15 +17,13 @@ const createFixture = async (serviceManager) => {
     stop: () => {},
     middlewares: _.mapValues(middlewares, (service) =>
       _.mapValues(service, (method) => {
-        let methodStub;
-
         if (method.callback) {
-          methodStub = sinon.stub().returns(sinon.stub().callsArg(2));
-          methodStub.callback = true;
-        } else {
-          methodStub = sinon.stub().callsArg(2);
+          const callbackStub = sinon.stub().returns(sinon.stub().callsArg(2));
+          callbackStub.callback = true;
+          return callbackStub;
         }
 
+        const methodStub = sinon.stub().callsArg(2);
         methodStub.validations = _.mapValues(method.validations, () => sinon.stub().callsArg(2));
 
         return [...Object.values(methodStub.validations), methodStub];
@@ -84,7 +82,8 @@ const checkFixture = (fixture, expected) => {
     if (!(service in expected.middlewares)) expected.middlewares[service] = {};
     Object.keys(middlewares[service]).forEach((method) => {
       const expressMiddlewares = middlewares[service][method];
-      const middlewareMethod = expressMiddlewares[expressMiddlewares.length - 1];
+      // if no length -> callback middleware -> it's not an array
+      const middlewareMethod = expressMiddlewares.length ? expressMiddlewares[expressMiddlewares.length - 1] : expressMiddlewares;
 
       if (middlewareMethod.validations) {
         if (!validations.middlewares[service]) validations.middlewares[service] = {};