[Test]
 public void MessageBoxShow_should_be_callable_indirectly()
 {
    using (new IndirectionsContext())
   {
    // Arrange
    var mockMessageBox = new Mock<IndirectionFunc<string, DialogResult>>();
    mockMessageBox.Setup(_ => _(string.Empty)).Returns(DialogResult.OK);

    PMessageBox.ShowString().Body = mockMessageBox.Object;

    // Act
    MessageBox.Show("This is a message");

    // Assert
    mockMessageBox.Verify(_ => _("This is a message"));
  }
}