MSTest run fails because source assembly is not trusted

mstest

I just added xUnit to our test project (for the Asserts, we're still using MSTest as the framework) and immediately the test runs refused to execute any of the tests. This is the error message:

Failed to queue test run '{ …. }'
Test run deployment issue: The
location of the file or directory
'…xUnit.dll' is not trusted.

Best Answer

It took me a few tries to find the answer in Google, so I'm putting it here in case anyone else runs into the same problem. A detailed description can be found at this blog posting.

Basically, the fix invovles right-clicking on the dll file (xunit.dll for example) in Windows Explorer, going to Properties, and clicking "Unblock" at the bottom of the tab next to the 'Security' text. It seems that Vista / Windows 2008 will automatically mark assemblies that come from other machines or the internet as unsafe.

As a couple commenters have mentioned, you may also need to restart Visual Studio for this to take effect.

Related Solutions

C# – MSTest: No tests are run because no tests are loaded or the selected tests are disabled

Another one for the googlers - this one turned out to be my problem, and it's embarrassingly boneheaded of me. Make sure that your test project is set to build in whatever solution configuration you're using. If the test assembly isn't being built, VS won't be able to find any tests in the non-existent assembly, and you'll bang your head against the wall for a while :-)

.net – Is it possible to execute code once before all tests run

FWIW, you can use the AssemblyInitialize attribute to run code before all unit tests in an assembly executes:

[TestClass]
public class SetupAssemblyInitializer
{
    [AssemblyInitialize]
    public static void AssemblyInit(TestContext context)
    {
        // Initalization code goes here
    }
}

If you have more than one unit test assembly, I'm not aware of anything that encompasses more than one assembly.

As far as I'm aware, this is as close as you can get to a Main equivalent.

Note that the AssemblyInitialize-decorated method must be in a TestClass-decorated class which contains at least one TestMethod-decorated method, otherwise it will not be executed!

Best Answer

Related Solutions

C# – MSTest: No tests are run because no tests are loaded or the selected tests are disabled

.net – Is it possible to execute code once before all tests run

Related Topic