Top asked advanced TestNG annotations: Set-1 for SDET/Automation Testing/Developers?

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Must know TestNG annotations for Experienced Automation Testers

• alwaysRun 

If set to true, this test method will always be run even if it depends on a method that failed.

• dependsOnMethods

The list of methods this method depends on.

• @test:

Marks a class or a method as part of the test.

Example:

@Test

public void methodone() {

           System.out.println("Methodone");

           // Failing test explicitly

           Assert.fail();

      }

      // alwaysRun attribute will override dependsOnMethods if dependent method is failed or skipped

      @Test(dependsOnMethods = "methodone", alwaysRun=true)

      public void methodtwo() {

           System.out.println("Method two");

      }

• Description:    

The description for this method. It is important to give a small information about the test case.

• Enabled:

Whether methods on this class/method are enabled.

When executing TestNG tests, there are scenarios where you have to disable a particular test or a set of tests from getting executed. For example, where a serious bug exists in a feature due to certain tests belonging to certain scenarios that cannot be executed. As the issue has already been identified we may need to disable the test scenarios from being executed.

Disabling a test in TestNG can be done by setting the enable attribute of the @Test annotation to false. This will disable the test method from being executed as part of the test suite.

Note: If this attribute is set for the Test annotation at class level, all the public methods inside the class will be disabled.

Example:

@Test( description = "Verify Login with valid credentials", enabled=false )

Public void login(){}

• invocationCount 

The number of times this method should get invoked.

• threadPoolSize  

The size of the thread pool for this method. The method will be invoked from multiple threads as specified by invocationCount.

Note: this attribute is ignored if invocationCount is not specified

• timeOut   

The maximum number of milliseconds this test should take.

Earlier we discussed how to run classes, methods, and tests in parallel or in multi-threaded mode. TestNG also provides the flexibility to configure a test method to be run in a multi-threaded environment. This is achieved by configuring it while using the @Test annotation on a method.

AutoTest.java

public class AutoTest

{

    @Test(threadPoolSize = 3, invocationCount = 6, timeOut = 1000)

    public void testMethod()

    {

        Long id = Thread.currentThread().getId();

        System.out.println("Test method executing on thread with id as: " + id);

    }

}

The method is configured to run in multi-threaded mode by using the threadPoolSize attribute along with the Test annotation. The value of the threadPoolSize is set to 3; this configures the test method to be run in three different threads.

The other two attributes, invocationCount and timeOut, configures the test to be invoked a multiple number of times and fail if the execution takes more time.

•  expectedExceptions      

The list of exceptions that a test method is expected to throw. If no exception or a different than one on this list is thrown, this test will be marked a failure.

public class ExceptionTesting {

    @Test(expected = ArithmeticException.class)

    public void testWithException() {

        int i = 1 / 0;

    }

 

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