NUnit Tutorial: Parameterized Tests With Examples

NUnit Tutorial: Parameterized Tests With Examples

In this guide, we will showcase NUnit parameterized test cases along with the commonly used attributes like the TestFixture NUnit attribute.

Cross-browser testing has become an integral part of the test process to ensure the product experience and behavior remain consistent across different combinations of web browsers, devices, and operating systems. As testing has to be performed on varied combinations, it can lead to code duplication as a lot of test methods will be doing the same thing but on different input combinations. I have come across many such situations during the code optimization process when I felt that a part of the code is either duplicated or redundant.

One important lesson I learned from these situations is that you should never leave such activities for the future as it becomes more challenging to optimize with the increase in LOC (Lines of Code). This is where a parameterized test can be beneficial as it enables testing the code/methods against different input values. Test parameterization should be explored in cross-browser testing as the same tests need to be executed on different web browsers and different versions of the same web browser. In this blog, we learn how to execute NUnit parameterized tests with examples.

What Is Parameterization In NUnit?

NUnit is one of the widely used C## test frameworks for cross-browser testing as it is compatible with the Selenium test suite. NUnit supports parameterized tests since the release of NUnit 2.5. Test methods can have parameters, and various attributes are available that indicate what arguments should be supplied by the NUnit framework.

Some NUnit attributes enable specifying arguments inline, while other attributes use a separate method or field to hold the arguments.

We will use Visual Studio 2019 (Community Edition) for development, which can be downloaded from here.

Note: This blog will only focus on creating NUnit parameterized test examples that will aid you in the process of cross-browser testing or automated browser testing.

NUnit Parameterized Tests (Or Data-Driven Tests)

Parameterization of NUnit tests was introduced with version 2.5 (as mentioned above) and is considered extremely useful when used with the Selenium WebDriver. Using special attributes in NUnit, you can develop foolproof tests by verifying them on different browsers, browser versions, and platforms, which can be passed as parameters to the test.

To demonstrate an NUnit parameterized test example, we perform the test mentioned below:

  1. Open DuckDuckGo in the intended web browser.
  2. Locate the search box.
  3. Enter search query i.e., LambdaTest.
  4. Execute the search operation.
  5. Free up the resources.

You can refer to our detailed article on NUnit, which walks you through the implementation of executing the above-mentioned test without parameterization.

Cross-browser testing on the local Selenium grid can hit a roadblock as it is not feasible to have an in-house setup with different combinations of browsers, platforms, and devices.

Using a local Selenium grid for cross-browser testing can lead to a reduction of test coverage. Instead, cross-browser testing should be performed on cloud-based cross-browser testing platforms like LambdaTest, where testing can be performed on 2000+ browsers, thereby providing wider test coverage.

To get started, you should create an account on LambdaTest and note the user-name & access-key from the Profile Page. Desired capabilities can be generated using LambdaTest Capabilities Generator, and these capabilities enable to execute tests using different browser + OS combinations on remote Selenium grid. Along with parameterization, the prerequisite is that the tests have to be executed in parallel to complete test execution within a shorter time. With my current plan, I can execute five tests in parallel on the remote Selenium Grid on LambdaTest.

Let’s explore the different attributes in NUnit using which we can come up with an NUnit parameterized test:

TestCase Attribute

The TestCase attribute in NUnit marks a method with parameters as a test method. It also provides the inline data that needs to be used when that particular method is invoked. It can appear one or more times on the test method, with each appearance carrying values for the test case. Make more copies of the attribute if you want multiple cases. The data type of the values provided to the TestCase attribute should match with that of the arguments used in the actual test case.

This attribute that helps in coming up with an NUnit parameterized test also supports several additional named parameters like Author, Category, Description, ExpectedResult, TestName, etc. The execution order of the TestCase attribute can vary when used in combination with other data-providing attributes.

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