add unit test for changing back to previous setting before confirming new settings

SessionTests/Conversations/Settings/ThreadDisappearingMessagesViewModelSpec.swift

@@ -233,6 +233,69 @@ class ThreadDisappearingMessagesSettingsViewModelSpec: QuickSpec {
                             )
                         )
                     )
+                
+                context("change to another setting and change back") {
+                    // Change to another setting
+                    viewModel.tableData.first?.elements.first?.onTap?()
+                    // Change back
+                    viewModel.tableData.first?.elements.last?.onTap?()
+                    
+                    it("shows the previous setting with no set button") {
+                        expect(viewModel.tableData.first?.elements.last)
+                            .to(
+                                equal(
+                                    SessionCell.Info(
+                                        id: ThreadDisappearingMessagesSettingsViewModel.Item(
+                                            title: "DISAPPERING_MESSAGES_TYPE_AFTER_SEND_TITLE".localized()
+                                        ),
+                                        title: "DISAPPERING_MESSAGES_TYPE_AFTER_SEND_TITLE".localized(),
+                                        subtitle: "DISAPPERING_MESSAGES_TYPE_AFTER_SEND_DESCRIPTION".localized(),
+                                        rightAccessory: .radio(
+                                            isSelected: { true }
+                                        ),
+                                        accessibility: Accessibility(
+                                            identifier: "Disappear after send option",
+                                            label: "Disappear after send option"
+                                        )
+                                    )
+                                )
+                            )
+                        
+                        let title: String = (DisappearingMessagesConfiguration.validDurationsSeconds(.disappearAfterSend).last?
+                            .formatted(format: .long))
+                            .defaulting(to: "")
+                        expect(viewModel.tableData.first?.elements.last)
+                            .to(
+                                equal(
+                                    SessionCell.Info(
+                                        id: ThreadDisappearingMessagesSettingsViewModel.Item(title: title),
+                                        position: .bottom,
+                                        title: title,
+                                        rightAccessory: .radio(
+                                            isSelected: { true }
+                                        ),
+                                        accessibility: Accessibility(
+                                            identifier: "Time option",
+                                            label: "Time option"
+                                        )
+                                    )
+                                )
+                            )
+                        
+                        var footerButtonInfo: SessionButton.Info?
+                        
+                        cancellables.append(
+                            viewModel.footerButtonInfo
+                                .receiveOnMain(immediately: true)
+                                .sink(
+                                    receiveCompletion: { _ in },
+                                    receiveValue: { info in footerButtonInfo = info }
+                                )
+                        )
+                        
+                        expect(footerButtonInfo).to(beNil())
+                    }
+                }
             }
             
             it("has no footer button") {