add logging tests and fix misc bugs

Author: jeremydaly

index.js

@@ -276,11 +276,8 @@ class API {
 
     // Generate access log
     if ((this._logger.access || response._request._logs.length > 0) && this._logger.access !== 'never') {
-      let access = this._logger.log(
-        'access',
-        undefined,
-        response._request,
-        response._request.context,
+      let access = Object.assign(
+        this._logger.log('access',undefined,response._request,response._request.context),
         { statusCode: res.statusCode, coldStart: response._request.coldStart }
       )
       console.log(JSON.stringify(this._logger.format(access,response._request,response))) // eslint-disable-line no-console

lib/logger.js

@@ -6,6 +6,9 @@
  * @license MIT
  */
 
+ // IDEA: request counts
+ // IDEA: unique function identifier
+
 const UTILS = require('./utils') // Require utils library
 
 // Config logger
@@ -54,7 +57,6 @@ exports.config = (config,levels) => {
         path: req.path,
         ip: req.ip,
         ua: req.userAgent,
-        method: req.method,
         version: req.version,
         qs: Object.keys(req.query).length > 0 ? req.query : undefined
       }
@@ -77,14 +79,15 @@ exports.config = (config,levels) => {
     req: cfg.serializers && typeof cfg.serializers.req === 'function' ? cfg.serializers.req : () => {},
     res: cfg.serializers && typeof cfg.serializers.res === 'function' ? cfg.serializers.res : () => {},
     context: cfg.serializers && typeof cfg.serializers.context === 'function' ? cfg.serializers.context : () => {},
-    custom: cfg.serializers && typeof cfg.serializers.context === 'function' ? cfg.serializers.context : () => {}
+    custom: cfg.serializers && typeof cfg.serializers.custom === 'function' ? cfg.serializers.custom : () => {}
   }
 
   // Main logging function
   let log = (level,msg,req,context,custom) => {
 
-    let _context = Object.assign(defaults.context(context),serializers.custom(context))
-    let _custom = Object.assign(defaults.custom(custom),serializers.custom(custom))
+    let _context = Object.assign({},defaults.context(context),serializers.context(context))
+    let _custom = typeof custom === 'string' ? defaults.custom(custom) :
+      Object.assign({},defaults.custom(custom),serializers.custom(custom))
 
     return Object.assign({},
       {
@@ -101,13 +104,14 @@ exports.config = (config,levels) => {
       nested ? { [customKey]: _custom } : _custom,
       nested ? { context: _context } : _context
     )
-  }
+
+  } // end log
 
   // Formatting function for additional log data enrichment
   let format = function(info,req,res) {
 
-    let _req = Object.assign(defaults.req(req),serializers.req(req))
-    let _res = Object.assign(defaults.res(res),serializers.res(res))
+    let _req = Object.assign({},defaults.req(req),serializers.req(req))
+    let _res = Object.assign({},defaults.res(res),serializers.res(res))
 
     return Object.assign({},
       info,