How to use Moq to mock X509Certificate2?

Question

I need to have my X509Certificate2.Subject return gibberish for code coverage in unit tests. I've tried using Moq, but it fails because Subject is not a virtual method. Is there a way to do this, or do I have to re-invent the wheel here?

          Mock<X509Certificate2> mockCert = new Mock<X509Certificate2>(contextAccessor.Certificate.RawData);
      mockCert.Setup(m=>m.Subject).Returns("kjewnr,mwnzlxkcuvlkrj,wmelq");
      mockCert.CallBase = true;

      contextAccessor.Certificate = mockCert.Object;
      authenticatorAccessor.LogAuthentication(context);

Can Moq do this? If not, are there other libraries that will work for me? Thanks.

Error is: System.NotSupportedException: Invalid setup on a non-virtual (overridable in VB) member: m => m.Subject — ChopperCharles, May 31 '16 at 20:32
For properties use [Stub or SetupProperty](http://www.nudoq.org/#!/Packages/Moq/Moq/Mock(T)/M/SetupProperty(TProperty)) rather than Setup — stuartd, May 31 '16 at 20:43
Have you seen the answers to [this question](http://stackoverflow.com/questions/6836247/how-to-create-a-minimal-dummy-x509certificate2)? They mention something called Moles that may help you. Either that or creating a test certificate, because it seems that what you are attempting to do cannot be done, as the `Subject` property is non-virtual, as you say. — Charlie, Jun 01 '16 at 06:42
Stub doesn't exist in the mock framework, and setupProperty has the exact same problem. — ChopperCharles, Jun 02 '16 at 14:47

score 1 · Answer 1 · answered Feb 28 '22 at 12:40

Old post, but since I ran into this via Google, I figured I'd mention what worked for me.

private X509Certificate2 CreateSelfSignedCertificate()
{
    var ecdsa = ECDsa.Create();
    var req = new CertificateRequest("foobar", ecdsa, HashAlgorithmName.SHA256);
    X509Certificate2 cert = req.CreateSelfSigned(DateTimeOffset.Now, DateTimeOffset.Now.AddYears(5));

    return cert;
}

Where foobar is the subject you want mocked.

score 0 · Answer 2 · answered Jan 23 '17 at 21:44

0

It actually can't be done. I've moved away from Moq and am went back to using accessors instead.

answered Jan 23 '17 at 21:44

ChopperCharles

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How to use Moq to mock X509Certificate2?

2 Answers2