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Basic Of TestNG

What is TestNG ?

TestNG is a testing framework in which NG stands for “Next Generation” inspired from JUnit and NUnit. It has introduced some new functionalities that make it more powerful and easier to use.
 
As the nature of the framework, it tends to make our tests more structured and provides better validation points through TestNG use. TestNG gives the developer the ability to write more flexible and powerful tests.
 
As it heavily borrows from Java Annotations (introduced with JDK 5.0) to define tests, it can also show you how to use this new feature of the Java language in a real production environment.
 
The creator of TestNG is Cedric Beust.

Why We need it ?

We need TestNG because of its ability to write powerful test cases with the help of annotations, grouping, and parametrizing. It covers all classifications of test automation like Unit testing, Functional testing, End-to-End, and integration testing.
 
It’s available in the form of jar files. TestNG has multiple class interfaces and methods which will make tester tasks easy. TestNG provides additional functionality to create a robust framework.
 
Let’s understand the need for TestNG with the below example: 
 
Suppose, you have five test cases, one method is written for each test case (Assume that the program is written using the main method without using TestNG).
 
When you run this program first, three methods are executed successfully, and the fourth method is failed.
 
Then correct the errors present in the fourth method, now you want to run only the fourth method because the first three methods are anyway executed successfully. To achieve this you have to use the TestNG.
 
Apart from this default Selenium tests do not generate a proper format for the test results. Using TestNG in Selenium, we can generate more beautiful and readable test results.

How we can use it in the Testing?

You have to install TestNG to use it in your testing. We can download the library file in your system and then manually add it to the project’s build path where you want to use it. Also, you can install TestNG with Eclipse or TestNG with IntelliJ.
 
Before learning TestNG, you should have a basic understanding of testing and java.
 
Steps to Install TestNG in Eclipse
  1. Step 1: Launch eclipseIDE ->click on help option -> eclipse-> marketplace option.
  2. Step 2: Enter the keyword “TestNG “in the search box and then click “go”.
  3. Step 3: Click “install”. 
  4. Step 4: A confirmation window will open, click “confirm”.
  5. Step 5: The application will prompt you to accept the license and then click “finish”.

Advantages of TestNG?

  • It provides a powerful and wide variety of annotations to support your test cases.
  • Annotations are easy to understand.
  • Supports parameterized and dependency tests.
  • Support for data-driven testing.
  • Supported by a variety of tools and plug-ins (Eclipse, IDEA, Maven, etc).
  • It helps to perform parallel testing, dependent method testing.
  • It offers the flexibility to run your tests through multiple data sets through the TestNG.xml file or via the data-provider concept.
  • Test cases can be grouped and prioritized as per need basis.
  • Provides access to HTML reports and can be customized through various plugins.
  • With its Test logs can be generated across tests.

Disadvantages of TestNG?

  • Setup of TestNG is time-consuming.
  • If your project does not require test case prioritization that case TestNG is of no use.
  • In the olden day, it was less commonly used compared to JUnit, so fewer people was having experience with it.

TestNG Alternatives 

Mockito

It is a mocking framework that tastes really good. It lets you write beautiful tests with a clean & simple API. It doesn’t give you a hangover because the tests are very readable and they produce clean verification errors.

JUnit

JUnit is a simple framework to write repeatable tests. It is an instance of the xUnit architecture for unit testing frameworks.

Cucumber

A cucumber is a tool that supports Behaviour-Driven Development (BDD) – a software development process that aims to enhance software quality and reduce maintenance costs.

NUnit

An evolving, open-source framework designed for writing and running tests in Microsoft .NET programming languages. It is an aspect of test-driven development, which is part of a larger software design paradigm known as Extreme Programming.

Selenium

Selenium automates browsers. That’s it! What you do with that power is entirely up to you. Primarily, it is for automating web applications for testing purposes, but is certainly not limited to just that.

Boring web-based administration tasks can (and should!) also be automated as well.

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