public void Dev2Dialogue_NullImageSource_ValidTitleDescriptionDescriptionTitle_Expected_NullImageReference()
{
IDialogueViewModel dev2Dialogue = new DialogueViewModel();
dev2Dialogue.SetupDialogue("Test Title", "Test Description", null, "SomeTitleText");
Assert.IsTrue(dev2Dialogue.ImageSource == null);
// cleanup - Dispose of the dev2Dialogue
dev2Dialogue.Dispose();
}