private void VerifyExportErrorString(IConversation conversation, Exception ex, string descriptionExpected) { ExportError exportError = new ExportError(conversation, ex); var mockDescriptionHelper = new Mock<IConversationDescriptionHelper>(); mockDescriptionHelper.Setup(x => x.GetDescription(It.IsAny<IConversation>())) .Returns("<some conversation>"); ExportErrorFormatter errorFormatter = new ExportErrorFormatter(mockDescriptionHelper.Object); string descriptionActual = errorFormatter.Format(exportError); Assert.AreEqual(descriptionExpected, descriptionActual); }