Merge default options with config files if property not specified

lib/cli.js

@@ -50,14 +50,16 @@ function start(program, callback) {
 
     var server = null;
 
-    var opts = {
+    var defopts = {
       backend: {},
       logger: {},
       persistence: {
         factory: persistence.Memory
       }
     };
 
+    var opts = defopts;
+
     opts.port = program.port;
 
     if (program.parentPort || program.parentHost) {
@@ -90,6 +92,13 @@ function start(program, callback) {
 
     if (program.config) {
       opts = require(path.resolve(program.config));
+
+      // merge any unspecified options into opts from defaults (defopts)
+      Object.keys(defopts).forEach(function(key) {
+        if(typeof opts[key] === 'undefined') {
+          opts[key] = defopts[key];
+        }
+      });
     }
 
     if (program.verbose) {

test/cli_spec.js

@@ -152,6 +152,16 @@ describe("mosca.cli", function() {
     });
   });
 
+  it("should create necessary default options even if not specified in config file", function(done) {
+    args.push("-c");
+    args.push(process.cwd() + "/test/sample_config.js");
+    args.push("-v");
+
+    startServer(done, function(server) {
+      expect(server.opts).to.have.deep.property("logger.name", "mosca");
+    });
+  });
+
   it("should add an user to an authorization file", function(done) {
     args.push("adduser");
     args.push("myuser");