global class emailCreateCase implements Messaging.InboundEmailHandler {

global Messaging.InboundEmailResult handleInboundEmail(Messaging.inboundEmail email, 
                                                  Messaging.InboundEnvelope env){

// Create an inboundEmailResult object for returning 
// the result of the Force.com Email Service
Messaging.InboundEmailResult result = new Messaging.InboundEmailResult();

// Add the email plain text into the local variable
string myPlainText = email.plainTextBody;

// new Task object to be created
Case[] newCase = new Case[0];

    // Try to lookup any contacts based on the email from address
    // If there is more than 1 contact with the same email address
    // an exception will be thrown and the catch statement will be called
try {
  // Add a new Task to the contact record we just found above
   newCase.add(new Case(Description = myPlainText,
     Subject = email.subject,
     Origin = 'Email',
     SuppliedEmail = email.fromAddress,
     SuppliedName = email.fromName));

  // Insert the new Task and it will be created and appended to the contact record
      insert newCase;  
System.debug('New Task Object: ' + newCase );
}
   // If there is an exception with the query looking up
   // the contact this QueryException will be called.
   // and the exception will be written to the Apex Debug logs

   catch (System.QueryException e) {
   System.debug('Query Issue: ' + e);
}

// Set the result to true, no need to send an email back to the user
// with an error message

  result.success = true;

  // Return the result for the Force.com Email Service
  return result;
}

static testMethod void testCases() {

// Create a new email and envelope object
   Messaging.InboundEmail email = new Messaging.InboundEmail();
   Messaging.InboundEnvelope env = new Messaging.InboundEnvelope();

// Create the plainTextBody and fromAddres for the test
 email.plainTextBody = 'Here is my plainText body of the email';
 email.fromAddress ='rmencke@salesforce.com';

emailCreateCase caseObj = new emailCreateCase();
caseObj.handleInboundEmail(email, env);
} 

}