Unit Testing a c# project which uses native code

Question

I have three projects

1)unmanaged c++ containing full business logic

2)C++/CLI (Project name managed)

3)C# GUI

I have added the library file of unmanaged c++ in C++/CLI and then dll of C++/CLI in C# project.This this all is working fine and execution is trouble-less.

Now i want to do unit testing of C# function that does call the C++/CLI wrapper and then get the results back.I created a unit test using Visual Studio 2010.I added the dll of C++/CLI in my test project.Now when i am trying to execute the test it throws the exception managed.dll not found

Here is the code

   [TestMethod()]
   public void getstateTest()
   {
    bool expected=true;
    bool actual=false;
    try
     {
        GUI.test target = new test();
        expected    = true; // TODO: Initialize to an appropriate value
        actual      = target.getstate();
     }
     catch (FileNotFoundException exception)
     {
        MessageBox.Show("Missing file is : " + exception.FileName);
     }
     Assert.AreEqual(expected, actual);
    }



    The getstate function is

namespace GUI
{
public class test
{
    public bool getstate()
    {
        bool chk = false;
        bool result;
        String a = "some path";
        String b = "some path"
        String c = "some path"
        managed  objct;
        objct = new  managed();
        objct.Initialize(a, b, c, chk);
        objct.Execute();//calls the C++/CLI execute which calls unmanaged C++
        result = objct.Executionresult();//gets a bool result
        return result;
    }
}

}

Same thing works fine when i run the application but on running the test project it says the dll is missing

Sorry if i made it confusing.Please ask if you need more information.Thanks in advance

Is the DLL reported as missing or an invalid format? Your unit tests need to be run with the same bitness as the native code they load. — Ben Voigt, Mar 21 '12 at 18:26
Dll is reported as missing...the unit tests and native code are all running in x86 — manu_dilip_shah, Mar 22 '12 at 04:22

Dmitry Reznik · Accepted Answer · 2012-03-21T07:13:24.560

1

Have you looked at the test project output folder ? Maybe the managed.dll isn't copied to the output.

Update:

Could you please post fusion log from the exception ? This should give some ideas why the file is not found.

edited Mar 21 '12 at 07:13

answered Mar 21 '12 at 05:53

Dmitry Reznik

6,812
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output files of all the projects are in the same folder and all are present – manu_dilip_shah Mar 21 '12 at 07:04
i haven't used fusion log before...i am presently working on it and will tell you.... – manu_dilip_shah Mar 21 '12 at 08:20
Dmitry Reznik:fusion log is not showing anything...mine is a test project which throws that exception while running a test – manu_dilip_shah Mar 21 '12 at 08:58

score 0 · Answer 2 · answered Mar 21 '12 at 05:56

0

The projects are probably compiling to different directories.

This causes the compiler to compile correctly, but at runtime it can't find the files.

This often happens when you import separate projects into a new solution.

Make the new Unit test compile to the same directory.

answered Mar 21 '12 at 05:56

Yochai Timmer

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All the projects are compiling to the same common directory – manu_dilip_shah Mar 21 '12 at 07:04

Unit Testing a c# project which uses native code

2 Answers2