.NET NUnit test - Assembly.GetEntryAssembly() is null

Question

When class used Assembly.GetEntryAssembly() run in unit test, the Assembly.GetEntryAssembly() is null.

Is there some option h

Answer 1

You could do something like this with Rhino Mocks: Encapsulate the Assembly.GetEntryAssembly() call into a class with interface IAssemblyLoader and inject it into the class your are testing. This is not tested but something along the lines of this:

[Test] public void TestSomething() {
  // arrange
  var stubbedAssemblyLoader = MockRepository.GenerateStub();
  stubbedAssemblyLoader.Stub(x => x.GetEntryAssembly()).Return(Assembly.LoadFrom("assemblyFile"));

  // act      
  var myClassUnderTest = new MyClassUnderTest(stubbedAssemblyLoader);
  var result = myClassUnderTest.MethodToTest();

  // assert
  Assert.AreEqual("expected result", result);
}

public interface IAssemblyLoader {
  Assembly GetEntryAssembly();
}
public class AssemblyLoader : IAssemblyLoader {
  public Assembly GetEntryAssembly() {
    return Assembly.GetEntryAssembly();
  }
}