Test class for Apex Trigger

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I am new in Apex Development.

I want to write a TestClass for my Apex Trigger.

I am sharing my code with you.

trigger UpdateContact on Account (after Insert) {

    List <Contact> contactList=new List<Contact>();

    for(Account a:Trigger.new)
    {
        Contact c=new Contact(LastName=a.Name, AccountId=a.id);
        contactList.add(c);
    }

    insert contactList;

}
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Quan On BEST ANSWER

Since your trigger in on Account (after insert), provided that there is no other mandatory field or validation rule, just simply insert an account to test your trigger:

@isTest
private class UpdateContactTest 
{
    static testMethod void myUnitTest()
    {
        Account acc = new Account(
            Name = 'Test');

        insert acc;
    }
}