Parameterized tests with MSTest

I’ve always been an NUnit or XUnit user, but from time to time I take another look at MSTest to see where Microsoft is going with their Test framework.

With the latest version MS-Test 2, Microsoft introduced a new feature: parametrized tests (Do I have to mention that this feature exists for a long time in NUnit and XUnit? ).

Let’s try it:

• Create a new Test project in Visual Studio 2017. Th test Project template already includes the MsTest.TestAdapter and MsTest.TestFramework NuGet packages.
• Right click on your project, select Manage NuGet packages… Update the test packages to the latest version. The default packages are a little bit outdated.
• Let’s write our parameterized test:

	[DataTestMethod]
	public void Resize_Should_Succeed_For_SupportedImageVersions(string version)
	{
	ResizeFile(version);
	}

view raw ParameterizedTest.cs hosted with ❤ by GitHub

• Notice that there are some small differences:
• Instead of the TestMethod attribute, we are using the DataTestMethod attribute
• Instead of a method without parameters, we expect one parameter as part of our test.
• Now we have to provide the different possible values for the test using the DataRow attribute:

	[DataRow("original")]
	[DataRow("thumbnail")]
	[DataRow("small")]
	[DataRow("medium")]
	[DataRow("large")]
	[DataRow("square")]
	[DataTestMethod]
	public void Resize_Should_Succeed_For_SupportedImageVersions(string version)
	{

view raw DataRowAttribute.cs hosted with ❤ by GitHub

• Let’s now run the test: