Missing Example on how-to get properly get the TestContext

[TiltonJH]

Type of issue

Missing information

Description

Hello,

I am trying to resolve warnings concerning MSTEST0049: Flow TestContext cancellation token.

It would be nice if there were an async test example that would show a way to properly get the TestContext within an async test method and then use the CancellationToken of it.

In my cases the provided code fixer does create a property public TestContext TestContext { get; set; } and use it to get the CancellationToken of it. So far so good.

But now I run into CS8602: Possible dereference of null since the compiler does not see the property being set.

Can I simply ignore (!) this? Is this the proper way?

Related to #52340

Page URL

https://learn.microsoft.com/en-us/dotnet/core/testing/mstest-analyzers/mstest0049

Content source URL

https://github.com/dotnet/docs/blob/main/docs/core/testing/mstest-analyzers/mstest0049.md

Document Version Independent Id

11c7ec45-be3b-5457-c153-7a6e18432673

Platform Id

a38be9f6-7220-b23e-82fc-69b19cc33c6a

Article author

@Evangelink

Metadata

• ID: dcd4363a-81ca-4b25-6147-d0ed5a5f28c0
• PlatformId: a38be9f6-7220-b23e-82fc-69b19cc33c6a
• Service: dotnet-fundamentals

Related Issues

[TiltonJH]

Doing further experimentation, I found that a public TestContext TestContext { get; set; } within a class marked as [TestClass] does not cause an CS8602: Possible dereference of null. Cannot just yet figure out how this is done, but that's nice! 👍

My issue comes because I have written a base class that already implements the property as well as uses it. The abstract base class cannot use the [TestClass] attribute due to (MSTEST0016: Test class should have test method)[https://learn.microsoft.com/en-us/dotnet/core/testing/mstest-analyzers/mstest0016], which it doesn't have either.

I am considering public TestContext TestContext { get; set; } = null!; or something like [TestMethod] public void CanAccessTestContext() { Assert.IsNotNull(this.TestContext); } as a workaround in the base class.

Are there better ways to do that?

[TiltonJH]

I found another workaround: public required TestContext TestContext { get; set; }.