increased test coverage for smtp appender

lib/appenders/smtp.js

@@ -22,32 +22,31 @@ function smtpAppender(config, layout) {
 	var sendTimer;
 	
 	function sendBuffer() {
-    if (logEventBuffer.length === 0) {
-			return;
-    }
+    if (logEventBuffer.length > 0) {
 		
-		var transport = mailer.createTransport(config.transport, config[config.transport]);
-		var firstEvent = logEventBuffer[0];
-		var body = "";
-		while (logEventBuffer.length > 0) {
-			body += layout(logEventBuffer.shift()) + "\n";
-		}
-		
-		var msg = {
-			to: config.recipients,
-			subject: config.subject || subjectLayout(firstEvent),
-			text: body,
-			headers: {"Hostname": os.hostname()}
-		};
-		if (config.sender) {
-			msg.from = config.sender;
+      var transport = mailer.createTransport(config.transport, config[config.transport]);
+      var firstEvent = logEventBuffer[0];
+      var body = logEventBuffer.map(layout).join('\n');
+      var msg = {
+        to: config.recipients,
+        subject: config.subject || subjectLayout(firstEvent),
+        text: body,
+        headers: { "Hostname": os.hostname() }
+      };
+
+      if (config.sender) {
+        msg.from = config.sender;
+      }
+
+      transport.sendMail(msg, function(error, success) {
+        if (error) {
+          console.error("log4js.smtpAppender - Error happened", error);
+        }
+        transport.close();
+      });
+
+      logEventBuffer = [];
     }
-		transport.sendMail(msg, function(error, success) {
-			if (error) {
-				console.error("log4js.smtpAppender - Error happened ", error);
-			}
-      transport.close();
-		});
 	}
 	
 	function scheduleSend() {