Test Class in Salesforce

#ProgrammingMadeEasy
Hello and welcome to another salesforce tutorial video. In this video we are going to talk about test classes. A test class is an apex class that tests your logic written in either apex class or trigger programatically.
A test class actually ensures that your code is working fine as expected.
What are test classes ? and how to write test classes with best practices.
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,What is the use of test class in Salesforce
Timestamps
00:00 Introduction
01:43 Getting started with test classes
04:06 How to approach to a solution
09:39 How to encounter Errors