NHibernate: How to reference the assembly of the main project from the unit test project?

Question

I built a simple NHibernate Application but i wanted to use Mapping Attributes instead of Mapping XML.

Now i have the problem, when i create a Unit Test Project and want to load the Mapping Attributes, that my domain objects are in the other project!

This is my Unit Test:

using System;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using NHibernate.Cfg;
using NHibernate.Tool.hbm2ddl;

namespace Tests
{
[TestClass]
public class UnitTest1
{
    [TestMethod]
    public void TestMethod1()
    {
        Configuration cfg = new Configuration();
        cfg.Configure();
        cfg.AddInputStream(NHibernate.Mapping.Attributes.HbmSerializer.Default.Serialize(
            System.Reflection.Assembly.GetExecutingAssembly()));
        new SchemaExport(cfg).Execute(false, true, false);
    }
}

In this line

cfg.AddInputStream(NHibernate.Mapping.Attributes.HbmSerializer.Default.Serialize(
            System.Reflection.Assembly.GetExecutingAssembly()));

I get this Exception:

Result Message: 
Test method Tests.UnitTest1.TestMethod1 threw exception: 
NHibernate.Mapping.Attributes.MappingException: The following assembly contains 
no mapped classes: Tests, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null
Result StackTrace:  
at NHibernate.Mapping.Attributes.HbmSerializer.Serialize(Stream stream, Assembly assembly)
   at NHibernate.Mapping.Attributes.HbmSerializer.Serialize(Assembly assembly)
   at Tests.UnitTest1.TestMethod1() in ...Tests\UnitTest1.cs:Line 17.

I guess instead of

System.Reflection.Assembly.GetExecutingAssembly()

I have to get somehow the assembly of my main project.

Answer 1

I found the easiest way to do this was with:

Assembly.Load("Project Name of Desired Assembly")

I read a lot of stuff online to do this, including this post, and nothing was more simple than using this method. Also, the methods mentioned by JoelC probably work, however I couldn't get them to work for me and this worked no problems.

Answer 2

Yeah, calling System.Reflection.Assembly.GetExecutingAssembly() from unit tests usually will give you the unit test runner as the executing assembly.

You should be able to call typeof([TargetAssemblyClass]).Assembly to find your main project assembly. This, of course, requires a reference to the main project which I expect you already have.

Edit: Calling System.Reflection.Assembly.GetAssembly(typeof([TargetAssemblyClass])) is another way to achieve the same thing.