🛑🛑 What is TDD (Test Driven Development)? | How to do TDD with Example 🛑🛑

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In this video, We are going to learn What is TDD (Test Driven Development)? and How to do TDD with Example.

🚀 What is TDD?

• Iterative development process.
• Every iteration starts with a set of tests written for a new piece of functionality.
• Test cases are created before code is written
• TDD instructs developers to write new code only if an automated test has failed.

🚀 What are the main benefits of TDD?

• Small Regression Suite
• We are doing Test First, Reduction in Bugs
• TDD is used to make the code clearer, simple and bug-free.
• Avoids duplication of code
• Refactoring improves the code
• TDD drives the code design and approach
• Unit test cases are covered early.

Example fo TDD

• Create a Maven Project.
• Add Testcases in Test class.

package com.thetestingacademy;

import static com.thetestingacademy.App.isValidUserName;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import com.thetestingacademy.App.*;
import org.junit.Test;

/**
 * Unit test for simple App.
 */
public class AppTest 
{
    /**
     * Rigorous Test :-)
     */
    @Test
    public void shouldAnswerWithTrue() {
        String userName = "PramodDutta";
        String userName1 = "Pramod Dutta";
        String userName2 = "Pramod@123";
        String userName3 = "Pramod_Dutta";
        String userName4 = "Pramod/Dutta";
        String userName5 = "Pramod#Dutta";
        assertTrue(isValidUserName(userName));
        assertFalse(isValidUserName(userName1));
        assertFalse(isValidUserName(userName2));
        assertFalse(isValidUserName(userName3));
        assertFalse(isValidUserName(userName4));
        assertFalse(isValidUserName(userName5));
    }
}

• Now Execute it, It will fail
• Fix them one by one
• Repeat

package com.thetestingacademy;

/**
 * Hello world!
 *
 */
public class App 
{
    public static void main( String[] args )
    {
        System.out.println( "Hello World!" );
        String userName = "PramodDutta";
        String userName1 = "Pramod Dutta";
        isValidUserName(userName);
        // What is Valid UserName
    }

    static boolean isValidUserName(String name){
        if(name.contains("/") || name.contains("#") || name.contains(" ") ||  name.contains("@") || name.contains("_")){
            return false;
        }
        return true;
    }

}

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