Added a define to format the spiffs in SPIFFS_Test.ino

Author: lbernstone

libraries/SPIFFS/examples/SPIFFS_Test/SPIFFS_Test.ino

@@ -1,6 +1,11 @@
 #include "FS.h"
 #include "SPIFFS.h"
 
+// Format SPIFFS the first time you run a test
+// or else use the SPIFFS plugin to create a partition
+// https://github.com/me-no-dev/arduino-esp32fs-plugin
+//#define FORMAT_SPIFFS true
+
 void listDir(fs::FS &fs, const char * dirname, uint8_t levels){
     Serial.printf("Listing directory: %s\r\n", dirname);
 
@@ -151,7 +156,7 @@ void testFileIO(fs::FS &fs, const char * path){
 
 void setup(){
     Serial.begin(115200);
-    if(!SPIFFS.begin()){
+    if(!SPIFFS.begin(FORMAT_SPIFFS)){
         Serial.println("SPIFFS Mount Failed");
         return;
     }