How does one test async code using MSTest

Question

I'm writing some super simple async code. Just saving a file off-thread.

I'd like to test this code using the MSTest unit test framework in Microsoft Visual Studio Team System 2008.

How do I do this?

I'd like to simple block the test method until the method returns. I can imagine some ways to do this, but I'm blown away there aren't any best practices or helper classes around this.

I see a lot for Silverlight, but nothing generic.

Duplicate? stackoverflow.com/questions/1174702/… (I think the provided answers are not directly related to which testing framework that is used) — Fredrik Mörk
– Fredrik Mörk, Commented Jan 13, 2010 at 22:16

Spatz · Accepted Answer · 2020-02-05 03:59:27Z

218

Visual studio 2012 (previously known as "Visual Studio 11") introduced support for async tests. It looks like this:

[TestMethod] public async Task FooTest() { var result = await SomeAsyncOperation(); Assert.IsTrue(someCondition); }

As noted in the comments, the Task return type is important. It won't work if you declare the method as returning void.

edited Feb 5, 2020 at 3:59

Spatz

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answered May 24, 2012 at 11:46

Wim Coenen

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3 Comments

Ohad Schneider Over a year ago

Note that the Task return type is mandatory - void won't work (at least not on VS2013 update 4)

Richard Szalay Over a year ago

(It will never work, since void-returning async methods cannot be awaited)

Wim Coenen Over a year ago

@RichardSzalay: it can be made to work, see here how NUnit does it: stackoverflow.com/questions/15031681/…

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