[My store] Fix error banner so it appears when stats data can't be loaded

RELEASE-NOTES.txt

@@ -7,6 +7,8 @@
 - [*] Orders with Coupons: Users can now select a coupon from a list when adding it to an order. [https://github.com/woocommerce/woocommerce-ios/pull/10255]
 - [Internal] Orders: Improved error message when orders can't be loaded due to a parsing (decoding) error. [https://github.com/woocommerce/woocommerce-ios/pull/10252]
 - [**] Product discounts: Users can now add discounts to products when creating an order. [https://github.com/woocommerce/woocommerce-ios/pull/10244]
+- [Internal] Fixed a bug preventing the "We couldn't load your data" error banner from appearing on the My store dashboard. [https://github.com/woocommerce/woocommerce-ios/pull/10262]
+
 - [Internal] A new way to create a product from an image using AI is being A/B tested. [https://github.com/woocommerce/woocommerce-ios/pull/10253]
 
 14.5

WooCommerce/Classes/ViewRelated/Dashboard/DashboardViewController.swift

@@ -931,6 +931,7 @@ private extension DashboardViewController {
 
     func onPullToRefresh() async {
         ServiceLocator.analytics.track(.dashboardPulledToRefresh)
+        hideTopBannerView() // Hide error banner optimistically on pull to refresh
         await withTaskGroup(of: Void.self) { group in
             group.addTask { [weak self] in
                 guard let self else { return }

WooCommerce/Classes/ViewRelated/Dashboard/DashboardViewModel.swift

@@ -113,6 +113,11 @@ final class DashboardViewModel {
                             timeRange: StatsTimeRangeV4,
                             latestDateToInclude: Date,
                             onCompletion: ((Result<Void, Error>) -> Void)? = nil) {
+        guard stores.isAuthenticatedWithoutWPCom == false else { // Visit stats are only available for stores connected to WPCom
+            onCompletion?(.success(()))
+            return
+        }
+
         let action = StatsActionV4.retrieveSiteVisitStats(siteID: siteID,
                                                           siteTimezone: siteTimezone,
                                                           timeRange: timeRange,
@@ -132,6 +137,11 @@ final class DashboardViewModel {
                               timeRange: StatsTimeRangeV4,
                               latestDateToInclude: Date,
                               onCompletion: ((Result<Void, Error>) -> Void)? = nil) {
+        guard stores.isAuthenticatedWithoutWPCom == false else { // Summary stats are only available for stores connected to WPCom
+            onCompletion?(.success(()))
+            return
+        }
+
         let action = StatsActionV4.retrieveSiteSummaryStats(siteID: siteID,
                                                             siteTimezone: siteTimezone,
                                                             period: timeRange.summaryStatsGranularity,

WooCommerce/Classes/ViewRelated/Dashboard/Stats v4/StoreStatsAndTopPerformersViewController.swift

@@ -238,9 +238,9 @@ private extension StoreStatsAndTopPerformersViewController {
                     DDLogError("⛔️ Error synchronizing order stats: \(error)")
                     periodSyncError = error
                 }
-                group.leave()
                 periodGroup.leave()
                 periodStoreStatsGroup.leave()
+                group.leave() // Leave this group last so `syncError` is set, if needed
             }
 
             group.enter()
@@ -254,9 +254,9 @@ private extension StoreStatsAndTopPerformersViewController {
                     DDLogError("⛔️ Error synchronizing visitor stats: \(error)")
                     periodSyncError = error
                 }
-                group.leave()
                 periodGroup.leave()
                 periodStoreStatsGroup.leave()
+                group.leave() // Leave this group last so `syncError` is set, if needed
             }
 
             group.enter()
@@ -270,9 +270,9 @@ private extension StoreStatsAndTopPerformersViewController {
                     DDLogError("⛔️ Error synchronizing summary stats: \(error)")
                     periodSyncError = error
                 }
-                group.leave()
                 periodGroup.leave()
                 periodStoreStatsGroup.leave()
+                group.leave() // Leave this group last so `syncError` is set, if needed
             }
 
             group.enter()
@@ -286,8 +286,8 @@ private extension StoreStatsAndTopPerformersViewController {
                     DDLogError("⛔️ Error synchronizing top earners stats: \(error)")
                     periodSyncError = error
                 }
-                group.leave()
                 periodGroup.leave()
+                group.leave() // Leave this group last so `syncError` is set, if needed
 
                 vc.removeTopPerformersGhostContent()
             }

WooCommerce/WooCommerceTests/ViewRelated/Dashboard/DashboardViewModelTests.swift

@@ -773,6 +773,36 @@ final class DashboardViewModelTests: XCTestCase {
         let dictionary = try XCTUnwrap(userDefaults[.hasDismissedBlazeBanner] as? [String: Bool])
         XCTAssertEqual(dictionary["\(sampleSiteID)"], true)
     }
+
+    func test_wpcom_stats_not_synced_when_authenticated_without_wpcom() {
+        // Given
+        stores = MockStoresManager(sessionManager: .makeForTesting(authenticated: true, isWPCom: false))
+        stores.whenReceivingAction(ofType: StatsActionV4.self) { action in
+            switch action {
+            case .retrieveSiteVisitStats, .retrieveSiteSummaryStats:
+                XCTFail("WPCom stats should not be synced when store is authenticated without WPCom")
+            default:
+                XCTFail("Received unsupported action: \(action)")
+            }
+        }
+        let viewModel = DashboardViewModel(siteID: sampleSiteID, stores: stores)
+
+        // When
+        let siteVisitStatsResult: Result<Void, Error> = waitFor { promise in
+            viewModel.syncSiteVisitStats(for: self.sampleSiteID, siteTimezone: .current, timeRange: .thisMonth, latestDateToInclude: .init()) { result in
+                promise(result)
+            }
+        }
+        let siteSummaryStatsResult: Result<Void, Error> = waitFor { promise in
+            viewModel.syncSiteSummaryStats(for: self.sampleSiteID, siteTimezone: .current, timeRange: .thisMonth, latestDateToInclude: .init()) { result in
+                promise(result)
+            }
+        }
+
+        // Then
+        XCTAssertTrue(siteVisitStatsResult.isSuccess)
+        XCTAssertTrue(siteSummaryStatsResult.isSuccess)
+    }
 }
 
 private extension DashboardViewModelTests {