Getting started with TestNG

TestNG is an automation testing framework for the Java programming language in which NG stands for “Next Generation”. TestNG is inspired by JUnit which uses the annotations (@). TestNG overcomes the disadvantages of JUnit and is designed to make end-to-end testing easy.

Since Selenium does not have itself a reporting functionality TestNG makes test creation, execution, reporting more efficient and you can easily come to know how many test cases are passed, failed, and skipped. You can execute the failed test cases separately.

It's much easier to add the TestNG plugin in the Eclipse plugin.
So let's get started…

1.Adding TestNG plugin in Eclipse

Select the help tab, go to Eclipse Marketplace and search for TestNG for Eclipse. You will see the plugin and just install it.

2.Adding Dependencies

Create a maven project and let's name it “SeleniumTestNG”.
Since we are going to create a maven project let's get selenium and other JAR files from the maven dependencies.

First, copy the selenium dependency and set it in the pom.xml file.
https://mvnrepository.com/artifact/org.seleniumhq.selenium/selenium-java/3.141.59

<dependency>
    <groupId>org.seleniumhq.selenium</groupId>
    <artifactId>selenium-java</artifactId>
    <version>3.141.59</version>
</dependency>

Copy the TestNG dependency and set it in the pom.xml file.
https://mvnrepository.com/artifact/org.testng/testng

<! —  https://mvnrepository.com/artifact/org.testng/testng →
<dependency>
 <groupId>org.testng</groupId>
 <artifactId>testng</artifactId>
 <version>7.4.0</version>
 <scope>test</scope>
</dependency>

As well as set the WebDriver maven dependency for making our test simple.
https://mvnrepository.com/artifact/io.github.bonigarcia/webdrivermanager/4.4.3

<dependency>
    <groupId>io.github.bonigarcia</groupId>
    <artifactId>webdrivermanager</artifactId>
    <version>4.4.3</version>
</dependency>

3.TestNG annotations

Before beginning our test lets have look at the TestNG annotations that we are going to use here.

@BeforeTest — The annotated method will be run before any test method belonging to the classes inside the <test> tag is run.

@Test — Marks a class or a method as part of the test.

@AfterTest — The annotated method will be run after all the test methods belonging to the classes inside the <test> tag have run.

4.Create the TestNG class

First, create a class named “TestNG_Demo”. You do not need to write the main() method in a TestNG class to run it as TestNG takes care of that by defining annotations. You just need to provide proper annotations to methods and the rest of TestNG will execute them in a manner by an implicit call to the main method of the TestNG class.

First, for a simple test let's take a code that validates the title of a page.

public static void main(String[] args) {
WebDriverManager.chromedriver().setup();
WebDriver driver = new ChromeDriver();
driver.manage().window().maximize();
driver.get("https://ikman.lk/");
String expectedTitleikman = "ikman.lk - Electronics, Cars, Property and Jobs in Sri Lanka";
String actualTitle = driver.getTitle();
if (actualTitle.contentEquals(expectedTitleikman)) {
System.out.println("Test Passed");
}else {
System.out.println("Test Failed");
}
driver.close();
}

This code explains how to get the title from the ”ikman.lk” and validate it with the actual title. Since this is written in the main method this should be run on a Java class.

You can see we have mentioned the actual URL and we have used if statement to decide whether it's really the actual title or not.

Let's write the same code in a TestNG class.

seleniumTest1.java

In this code, you can see we have used @Test, @BeforeTest, @AfterTest annotations to separate the code. As this test, first, run the @BeforeTest and run the actual @Test. Then comes the tearDown method.

Press CTRL + SHIFT + O to import all classes from the TestNG package.

And you cannot notice an if statement here because we have to use the assertion to compare both actualTitle and the expectedTitle by importing the Assert class from TestNG.

import org.testng.Assert;

5.TestNG test-output

After running the above TestNG Class we can see the actions performing and after a refresh, a Results folder is creating as ”test-output”.

TestNG Results folder

As you can see it has generated a different kind of reports as output. Let have a look at one of them.

index.html

It has shown us a clear report of our results by grouping them into different categories. In here since my test is passing it does not show any failed tests but if some exist this will show them and the time taken to execute that test case and so on.

For your reference find my GitHub profile here

mwickramanayaka/TestNG-Demo

THINK QUALITY!