Build.DefaultSample.CompileTests C# (CSharp) Method

        private void CompileTests()
        {
            new FileSet()
                .Include(directory_tools).RecurseAllSubDirectories.Filter("nunit.framework.dll")
                .Include(directory_tools).RecurseAllSubDirectories.Filter("rhino.mocks.dll")
                .Copy.To(directory_compile);

               var sourceFiles = new FileSet().Include(directory_base.SubFolder("tests")).RecurseAllSubDirectories.Filter("*.cs");
               Task.Build.Csc.Target.Library(compiler => compiler.AddSources(sourceFiles)
                                               .AddRefences(thirdparty_rhino, thirdparty_nunit, assembly_FluentBuild)
                                               .OutputFileTo(assembly_FluentBuild_Tests));
        }