added tests for the fileSync appender and changed the behavior of fileSync to create an empty log when called, just like the file appender does

lib/appenders/fileSync.js

@@ -31,6 +31,7 @@ function RollingFileSync (filename, size, backups, options) {
       fileSize = fs.statSync(file).size;
     } catch (e) {
       // file does not exist
+      fs.appendFileSync(filename, '');
     }
     return fileSize;
   }
@@ -128,6 +129,7 @@ RollingFileSync.prototype.write = function(chunk, encoding) {
  *   has been reached (default 5)
  */
 function fileAppender (file, layout, logSize, numBackups) {
+  debug("fileSync appender created");
   var bytesWritten = 0;
   file = path.normalize(file);
   layout = layout || layouts.basicLayout;
@@ -145,11 +147,17 @@ function fileAppender (file, layout, logSize, numBackups) {
         numFiles
       );
     } else {
-      stream = (function(f){
-        return {write: function(data, encoding) {
-            encoding = encoding || 'utf8';
-            fs.appendFileSync(f, data, {encoding: encoding});
-        }};
+      stream = (function(f) {
+        // create file if it doesn't exist
+        if (!fs.existsSync(f))
+            fs.appendFileSync(f, '');
+        
+        return {
+            write: function(data, encoding) {
+                encoding = encoding || 'utf8';
+                fs.appendFileSync(f, data, {encoding: encoding});
+            }
+        };
       })(file);
     }