moved method for getting undone migration files to public availability for better testing

lib/migrator.js

@@ -21,13 +21,37 @@ module.exports = (function() {
     var self = this
 
     return new Utils.CustomEventEmitter(function(emitter) {
-      getUndoneMigrations.call(self, function(migrations) {
+      self.getUndoneMigrations(function(migrations) {
         emitter.emit('success')
         console.log(migrations)
       })
     }).run()
   }
 
+  Migrator.prototype.getUndoneMigrations = function(callback)  {
+    var undoneMigrations = fs.readdirSync(this.options.path)
+
+    if(this.options.from) {
+      var fromDate = stringToDate(this.options.from.toString())
+
+      undoneMigrations = undoneMigrations.filter(function(file) {
+        var fileDate = stringToDate(file.split("-")[0])
+        return (fileDate >= fromDate)
+      })
+    }
+
+    if(this.options.to) {
+      var toDate = stringToDate(this.options.to.toString())
+
+      undoneMigrations = undoneMigrations.filter(function(file) {
+        var fileDate = stringToDate(file.split("-")[0])
+        return (fileDate <= toDate)
+      })
+    }
+
+    callback && callback(undoneMigrations)
+  }
+
   // private
 
   var executeMigration = function(path, method) {
@@ -78,29 +102,5 @@ module.exports = (function() {
     return moment(getFormattedDateString(s), "YYYYMMDDHHmmss")
   }
 
-  var getUndoneMigrations = function(callback)  {
-    var migrationFiles   = fs.readdirSync(this.options.path)
-      , undoneMigrations = migrationFiles
-
-    if(this.options.from) {
-      var sinceDate = stringToDate(this.options.from.toString())
-
-      undoneMigrations = migrationFiles.filter(function(file) {
-        var fileDate = stringToDate(file.split("-")[0])
-        return fileDate.diff(sinceDate) >= 0
-      })
-    }
-
-    if(this.options.to) {
-      var toDate = stringToDate(this.options.to.toString())
-      undoneMigrations = undoneMigrations.filter(function(file) {
-        var fileDate = stringToDate(file.split("-")[0])
-        return toDate.diff(fileDate) >= 0
-      })
-    }
-
-    callback && callback(undoneMigrations)
-  }
-
   return Migrator
 })()