title: OpenCover all mstest fail when -register:user is set
body: <p>Not sure what I am doing wrong while trying to use opencover. I am able to generate reports by running it against executable console apps however whenever I try to run it against actual test code I am in no luck. I have mstest and opencover added to system path.</p>
  
  <p>The library code:</p>
  
  <pre><code>namespace SimpleLibrary
  {
      public class SimpleClass
      {
  
          public string HelloWorld()
          {
              return "HelloWorld!";
          }
      }
  }
  </code></pre>
  
  <p>Test Code : </p>
  
  <pre><code>namespace SimpleTestProj
  {  
      [TestClass()]
      public class SimpleClassTest
      {
          [TestMethod()]
          public void HelloWorldTest()
          {
              SimpleClass target = new SimpleClass(); 
              string expected = "HelloWorld!"; 
              string actual;
              actual = target.HelloWorld();
              Assert.AreEqual(expected, actual);
          }
      }
  }
  </code></pre>
  
  <p>With '-register:user' flag the tests fail for some reason:</p>
  
  <pre><code>C:\nickolay\SimpleLibrary\SimpleTestProj\bin\Release&gt;opencover.console.exe  -output:"coverage.xml" -mergebyhash -target:
  "mstest.exe" -targetdir:"C:\nickolay\SimpleLibrary\SimpleTestProj\bin\Release" -targetargs:"/testcontainer:SimpleTestPro
  j.dll" -filter:+[*]* -register:user
  Executing: C:\Program Files\Microsoft Visual Studio 10.0\Common7\IDE\mstest.exe
  Microsoft (R) Test Execution Command Line Tool Version 10.0.30319.1
  Copyright (c) Microsoft Corporation. All rights reserved.
  
  Loading SimpleTestProj.dll...
  Starting execution...
  
  Results               Top Level Tests
  -------               ---------------
  Failed                SimpleTestProj.SimpleClassTest.HelloWorldTest
  0/1 test(s) Passed, 1 Failed
  
  Summary
  -------
  Test Run Failed.
    Failed  1
    ---------
    Total   1
  Results file:  C:\nickolay\SimpleLibrary\SimpleTestProj\bin\Release\TestResults\labuser.SDKiosk_SAN-D5RHRCK1 2013-07-24
  21_04_25.trx
  Test Settings: Default Test Settings
  Committing...
  Visited Classes 0 of 2 (0)
  Visited Methods 0 of 4 (0)
  Visited Points 0 of 9 (0)
  Visited Branches 0 of 4 (0)
  
  ==== Alternative Results (includes all methods including those without corresponding source) ====
  Alternative Visited Classes 0 of 2 (0)
  Alternative Visited Methods 0 of 6 (0)
  </code></pre>
  
  <p>Without '-register:user' it says that assemblies were not instrumented:</p>
  
  <pre><code>C:\nickolay\SimpleLibrary\SimpleTestProj\bin\Release&gt;opencover.console.exe  -output:"coverage.xml" -mergebyhash -target:
  "mstest.exe" -targetdir:"C:\nickolay\SimpleLibrary\SimpleTestProj\bin\Release" -targetargs:"/testcontainer:SimpleTestPro
  j.dll" -filter:+[*]*
  Executing: C:\Program Files\Microsoft Visual Studio 10.0\Common7\IDE\mstest.exe
  Microsoft (R) Test Execution Command Line Tool Version 10.0.30319.1
  Copyright (c) Microsoft Corporation. All rights reserved.
  
  Loading SimpleTestProj.dll...
  Starting execution...
  
  Results               Top Level Tests
  -------               ---------------
  Passed                SimpleTestProj.SimpleClassTest.HelloWorldTest
  1/1 test(s) Passed
  
  Summary
  -------
  Test Run Completed.
    Passed  1
    ---------
    Total   1
  Results file:  C:\nickolay\SimpleLibrary\SimpleTestProj\bin\Release\TestResults\labuser.SDKiosk_SAN-D5RHRCK1 2013-07-24
  21_08_43.trx
  Test Settings: Default Test Settings
  Committing...
  No results - no assemblies that matched the supplied filter were instrumented
      this could be due to missing PDBs for the assemblies that match the filter
      please review the output file and refer to the Usage guide (Usage.rtf)
  </code></pre>
  
  <p>Mstest successfully runs from the directory : </p>
  
  <pre><code>C:\nickolay\SimpleLibrary\SimpleTestProj\bin\Release&gt;mstest /testcontainer:SimpleTestProj.dll
  Microsoft (R) Test Execution Command Line Tool Version 10.0.30319.1
  Copyright (c) Microsoft Corporation. All rights reserved.
  
  Loading SimpleTestProj.dll...
  Starting execution...
  
  Results               Top Level Tests
  -------               ---------------
  Passed                SimpleTestProj.SimpleClassTest.HelloWorldTest
  1/1 test(s) Passed
  
  Summary
  -------
  Test Run Completed.
    Passed  1
    ---------
    Total   1
  Results file:  C:\nickolay\SimpleLibrary\SimpleTestProj\bin\Release\TestResults\labuser.SDKiosk_SAN-D5RHRCK1 2013-07-24
  21_11_00.trx
  Test Settings: Default Test Settings
  </code></pre>
  
  <p>My head is tired of being banged up against a wall here any help is appreciated.</p>