Testing Apex : Structure of Test Class for Apex Class

I saw a lot of questions on Test Methods on developer community asking how to write test class for apex class. So here I am writing a basic structure of a test class which tests an Apex Class

@isTest
private class testApexClass{

    private static TestMethod void testClassMethod(){
        
        //Step 1 : Data Insertion
        //Insert all the data required for your trigger according to your logic written in the trigger
        
        //Try to give unique values in fields while creating test data, like Name = 'TestAccountName' etc
        
        //If any configuration setting is also needed in your trigger insert that as well
        //If you create any configuration setting then you will need to create a user also so that mixed dml exception do not occur
        
        //If class has a constructor with parameter Standard Controller, that means VFP is using this class as extention and has a standard controller then please create a standard controller prior to instance of class

        //Create instance of Class 
        MyClass cls = new MyClass();

        test.startTest();
        
        //call the method that you want to test using instance of class
        cls.MethodToTest()
        
        //assert your results using system.assert and system.asserEquals 
        
        test.stopTest();
        // IF you have used any static variables
        
        
    }


}

In above structure we have not talked about the advance problems like mixed dml exception and profile base testing. We leave it for other day :)

Regards