Write Test Class for Extension Controller

Requirement :  Write Test Class for Extension Controller.

Before going to code first we know about Extension Controller in Apex.

A controller extension is an Apex class that extends the functionality of a standard or custom controller. Use controller extensions when:

• You want to leverage the built-in functionality of a standard controller but override one or more actions, such as edit, view, save, or delete.
• You want to add new actions.
• You want to build a Visualforce page that respects user permissions. Although a controller extension class executes in system mode, if a controller extension extends a standard controller, the logic from the standard controller does not execute in system mode. Instead, it executes in user mode, in which permissions, field-level security, and sharing rules of the current user apply.

Controller E xtension Class: below is our Controller Extension Class

public class yourExtController {
    public Account acc {get;set;}
    public yourExtController (ApexPages.StandardController stdController){
        this.acc = (Account)stdController.getRecord();
    }    
}

  Test Class : Now we write test class for Controller extension 

@istest
public class yourExtController_TC {
    
     static testMethod void test1()
     {
         Account acc = new Account(name='testAccount');
         insert acc;
        
         Test.startTest();
     
    ApexPages.StandardController account = new ApexPages.StandardController(acc);
    yourExtController obj = new yourExtController(account);
    obj.yourmethod();

    Test.stopTest();
     }
}

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