How to create NUnit test cases in C#?

To create NUnit test cases in C#:

1. Set Up NUnit: Add the NUnit and NUnit3TestAdapter NuGet packages to your project.
2. Create a Test Class: Create a new C# class and add the [TestFixture] attribute to denote it as a test class.
3. Write Test Methods: Add methods to the test class and annotate them with the [Test] attribute. Use assertions such as Assert.AreEqual, Assert.IsTrue, or Assert. Throws to validate outcomes.
4. Run Tests: Open the Test Explorer in Visual Studio. Build the solution, and the tests will appear in the explorer. Run tests individually or as a group and view the results.

How to execute failed test cases in TestNG?

TestNG is an open-source test automation framework inspired by JUnit and NUnit, designed to simplify testing needs with parallel testing, annotations, and data-driven testing.  To execute failed test cases in TestNG, you can use two methods:

1. Using testng-failed.xml File:
   • After running your test suite, right-click on the project and click Refresh.
   • Navigate to the test-output folder, where you will find the testng-failed.xml file.
   • Run the testng-failed.xml file to re-execute only the failed test cases.
2. Using IRetryAnalyzer Interface:
   • Create a class that implements the IRetryAnalyzer interface.
   • Override the retry (ITestResult result) method, which is called when a test fails.
   • Use a counter or custom logic to determine how many times to retry failed tests and return true to re-run or false to stop retrying.
   • Associate the retry logic with your test methods using the @Test(retryAnalyzer = RetryAnalyzer.class) annotation.

Which interface is used to retry the failed test cases in TestNG?

The IRetryAnalyzer interface is used to retry failed test cases in TestNG. It provides the retry (ITestResult result) method, which allows you to implement custom logic to determine whether a failed test should be retried.

How to execute only a few test cases in TestNG?

To execute only a few test cases in TestNG, you can use one of the following methods:

1. Using Groups: Assign specific test methods to a group using the @Test(groups = “groupName”) annotation. Run the test suite with only the desired group by specifying it in the TestNG XML file:
2. Using TestNG XML File: Specify the desired test methods or classes to execute in the <classes> section of the TestNG XML file.
3. Using enabled Attribute: Disable unnecessary tests by setting enabled = false in the @Test annotation.
4. Using TestNG Parameters: Use parameters in the TestNG XML file to filter the execution of specific test cases dynamically.