Salesforce: Test Class For Apex Email Service

This is the test class for the functionality Apex Email Service to create case from email, in Previous Article 

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@isTest private class Test_CustomEmailCase { static testMethod void testEmailToCase() { Test.startTest(); // Create a new email and envelope object Messaging.InboundEmail testEmail = new Messaging.InboundEmail(); Messaging.InboundEnvelope envelope = new Messaging.InboundEnvelope(); testEmail.subject = 'The email subject'; testEmail.plainTextBody = 'The email body'; testEmail.fromAddress = 'test.testing@sometest.com'; // Send the email CustomEmailCase TestEmailCase = new CustomEmailCase(); // Invock the handler function CustomEmailCase.handleInboundEmail(testEmail, envelope); system.assertEquals([SELECT Type FROM Case LIMIT 1].Type, 'New'); Test.stopTest(); } }

NB: This is for my future reference.