Introduction to TestNG

Introduction to TestNG

TestNG is a testing framework designed to simplify a broad range of testing needs, from unit testing (testing a class in isolation of the others) to integration testing (testing entire systems made of several classes, several packages and even several external frameworks, such as application servers).

Writinga test is typically a three-step process:

Write the business logic of your test and insert TestNG annotations in your code.

Add the information about your test (e.g. the class name, the groups you wish to run, etc...) in a testng.xml file or in build.xml.

Run TestNG.

You can find a quick example on the Welcome page.

Theconcepts used in this documentation are as follows:

A suite is represented by one XML file. It can contain one or more tests and is defined by the <suite> tag.

A test is represented by <test> and can contain one or more TestNG classes.

A TestNG class is a Java class that contains at least one TestNG annotation. It is represented by the <class> tag and can contain one or more test methods.

A test method is a Java method annotated by @Test in your source.

Therest of this manual will explain the following:

A list of all the annotations with a brief explanation. This will give you an idea of the various functionalities offered by TestNG but you will probably want to consult the section dedicated to each of these annotations to learn the details.

A description of the testng.xml file, its syntax and what you can specify in it.

A detailed list of the various features and how to use them with a combination of annotations and testng.xml.

Introductionof TestNG framework - Advantages of TestNG over Junit framework

In Selenium WebDriver training tutorial we have seen how to run Selenium scripts using JUnit framework. Until now we have execute selenium tests but we have not generated reports in JUnit. In this Selenium training article series we are introducing powerful new testing framework called TestNG. The TestNG framework means Next Generation testing framework, so we are seeing what all next generation features available in TestNG.

What is TestNG?

TestNG is testing framework inspired from most popular JUnit framework used for the Java programming language. The TestNG framework is introduced to overcome the limitations of JUnit framework. Most of the automation users are using this framework because of its advantages & more supported features. Until we have executed selenium test script but not even generated test reports. So using this TestNG framework we will learn how to generate test reports.

TestNG Framework

Featuresof TestNG Framework:

TestNG supports many powerful features & it is easy to use. Let’s see what all new features are supported in new testing framework:

Supportfor parameters.

Supports dependent methods testing.

Test configuration flexible.

Supports powerful execution model.

Embeds BeanShell for further flexibility.

TestNG has a more elegant way of handling parameterized tests with the data-provider concept.

For the same test class TestNG support for multiple instances.

Extendibility of using different Tools and plug-ins like Eclipse, Maven, IDEA etc.

Default JDK functions for runtime and logging (no dependencies).

TestNG supports annotations which are very helpful to guide test case executions. Similarly in JUnit, the TestNG annotations are always preceded by the ‘@’ symbol. It permit you do parallel execution of test cases & we can also skip the test cases effortlessly while executing test cases.

TestNG is specially designed to cover all types testing categories like Unit, Functional testing, Integration testing, End-to-end etc. Using TestNG framework allows us to generate test reports in both HTML and XML formats. Using ANT with TestNG, we can generate primitive Testng reports as well.

Advantagesof TestNG over Junit:

In TestNG Annotations are easy to understand over JUnit.

In TestNG there is no constraint like you have to declare @BeforeClass and @AfterClass, which is present in JUnit.

As method name constraint is present in JUnit, such method name constraint is not present in TestNG and you can specify any test method names.

In TestNG enable you to grouping of test cases easily which is not possible in JUnit.

TestNG supports following three 3 additional setUp/tearDown level:

@Before/AfterSuite, @Before/AfterTest and @Before/AfterGroup.

TestNG do not require extend any class.

TestNG allows us to define the dependent test cases each test case is independent to other test case.

TestNG allows us to execute of test cases based on group. Let’s take a scenario where we have created two set of groups “Regression” & “Sanity”. If we want to execute the test cases under Sanity group then it is possible in TestNG framework.

Parallel execution of Selenium test cases is possible in TestNG.