Assembly referenced in test project is not loaded

This actually appears to be the way .Net works and on can use the Assembly.GetReferencedAssemblies Method (https://msdn.microsoft.com/en-us/library/system.reflection.assembly.getreferencedassemblies.aspx)

I have an issue where I am testing AssemblyA from AssemblyA.Tests but I am not using any types directly from the test project AssemblyA.Tests.  Rather, the types from AssemblyA are instantiated from a third common test assembly that is called by test AssemblyA.Tests.  So something like this:

AssemblyA.Tests:

[Test]

public void Should_do_something()

{

    CommonTests.ThatUseClassInAssemblyA();

}

My problem is that AssemblyA is not loaded when running the tests.  I have switched off shadow copying so it is that.  When I create an explicit type from AssemblyA in the test project and instance it then AssemblyA does get loaded when running the tests.

Any ideas?

Using:

C#

NUnit 3.6.1

Resharper Ultimate 2016.3.2 (built 2017 January 26)