Issue #19175: Fix SyncTabs list not updating on changes

The main cause for this is that the `LifecycleProvider` needs to be set
to `State.RESUMED` to avoid the account manager's internal
`ObserverRegistry` from putting the UI observers into the paused state.

The rest of the changes is to rely the internal (safe) logic to
correctly sync and then update the tabs list.

app/src/main/java/org/mozilla/fenix/tabstray/AccessibleNewTabButtonBinding.kt

@@ -16,7 +16,6 @@ import mozilla.components.support.base.feature.LifecycleAwareFeature
 import mozilla.components.support.ktx.kotlinx.coroutines.flow.ifAnyChanged
 import org.mozilla.fenix.R
 import org.mozilla.fenix.tabstray.browser.BrowserTrayInteractor
-import org.mozilla.fenix.tabstray.syncedtabs.SyncedTabsInteractor
 import org.mozilla.fenix.utils.Settings
 
 /**
@@ -29,8 +28,7 @@ class AccessibleNewTabButtonBinding(
     private val store: TabsTrayStore,
     private val settings: Settings,
     private val newTabButton: ImageButton,
-    private val browserTrayInteractor: BrowserTrayInteractor,
+    private val browserTrayInteractor: BrowserTrayInteractor
-    private val syncedTabsInteractor: SyncedTabsInteractor
 ) : LifecycleAwareFeature {
 
     private var scope: CoroutineScope? = null
@@ -94,7 +92,6 @@ class AccessibleNewTabButtonBinding(
                         // a sync was requested.
                         if (!syncing) {
                             store.dispatch(TabsTrayAction.SyncNow)
-                            syncedTabsInteractor.onRefresh()
                         }
                     }
                 }

app/src/main/java/org/mozilla/fenix/tabstray/FloatingActionButtonBinding.kt

@@ -15,7 +15,6 @@ import mozilla.components.support.base.feature.LifecycleAwareFeature
 import mozilla.components.support.ktx.kotlinx.coroutines.flow.ifAnyChanged
 import org.mozilla.fenix.R
 import org.mozilla.fenix.tabstray.browser.BrowserTrayInteractor
-import org.mozilla.fenix.tabstray.syncedtabs.SyncedTabsInteractor
 import org.mozilla.fenix.utils.Settings
 
 /**
@@ -28,8 +27,7 @@ class FloatingActionButtonBinding(
     private val store: TabsTrayStore,
     private val settings: Settings,
     private val actionButton: ExtendedFloatingActionButton,
-    private val browserTrayInteractor: BrowserTrayInteractor,
+    private val browserTrayInteractor: BrowserTrayInteractor
-    private val syncedTabsInteractor: SyncedTabsInteractor
 ) : LifecycleAwareFeature {
 
     private var scope: CoroutineScope? = null
@@ -98,7 +96,6 @@ class FloatingActionButtonBinding(
                         // a sync was requested.
                         if (!syncing) {
                             store.dispatch(TabsTrayAction.SyncNow)
-                            syncedTabsInteractor.onRefresh()
                         }
                     }
                 }

app/src/main/java/org/mozilla/fenix/tabstray/NavigationInteractor.kt

@@ -12,9 +12,12 @@ import kotlinx.coroutines.launch
 import mozilla.components.browser.state.selector.getNormalOrPrivateTabs
 import mozilla.components.browser.state.selector.normalTabs
 import mozilla.components.browser.state.store.BrowserStore
+import mozilla.components.browser.storage.sync.Tab as SyncTab
 import mozilla.components.concept.engine.prompt.ShareData
 import mozilla.components.concept.tabstray.Tab
 import mozilla.components.service.fxa.manager.FxaAccountManager
+import org.mozilla.fenix.BrowserDirection
+import org.mozilla.fenix.HomeActivity
 import org.mozilla.fenix.collections.CollectionsDialog
 import org.mozilla.fenix.collections.show
 import org.mozilla.fenix.components.TabCollectionStorage
@@ -75,6 +78,11 @@ interface NavigationInteractor {
      * Used when adding [Tab]s as bookmarks.
      */
     fun onSaveToBookmarks(tabs: Collection<Tab>)
+
+    /**
+     * Called when clicking on a SyncedTab item.
+     */
+    fun onSyncedTabClicked(tab: SyncTab)
 }
 
 /**
@@ -83,6 +91,7 @@ interface NavigationInteractor {
 @Suppress("LongParameterList")
 class DefaultNavigationInteractor(
     private val context: Context,
+    private val activity: HomeActivity,
     private val browserStore: BrowserStore,
     private val navController: NavController,
     private val metrics: MetricController,
@@ -193,4 +202,13 @@ class DefaultNavigationInteractor(
 
         // TODO show successful snackbar here (regardless of operation succes).
     }
+
+    override fun onSyncedTabClicked(tab: SyncTab) {
+        metrics.track(Event.SyncedTabOpened)
+        activity.openToBrowserAndLoad(
+            searchTermOrURL = tab.active().url,
+            newTab = true,
+            from = BrowserDirection.FromTabTray
+        )
+    }
 }

app/src/main/java/org/mozilla/fenix/tabstray/TabsTrayController.kt

@@ -6,10 +6,8 @@ package org.mozilla.fenix.tabstray
 
 import androidx.navigation.NavController
 import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.launch
 import mozilla.components.concept.base.profiler.Profiler
 import mozilla.components.service.fxa.manager.FxaAccountManager
-import mozilla.components.service.fxa.sync.SyncReason
 import org.mozilla.fenix.browser.browsingmode.BrowsingMode
 import org.mozilla.fenix.browser.browsingmode.BrowsingModeManager
 import org.mozilla.fenix.components.metrics.Event
@@ -23,11 +21,6 @@ interface TabsTrayController {
      * Called when user clicks the new tab button.
      */
     fun onNewTabTapped(isPrivate: Boolean)
-
-    /**
-     * Starts user account tab syncing.
-     * */
-    fun onSyncStarted()
 }
 
 class DefaultTabsTrayController(
@@ -54,22 +47,6 @@ class DefaultTabsTrayController(
         sendNewTabEvent(isPrivate)
     }
 
-    override fun onSyncStarted() {
-        ioScope.launch {
-            metrics.track(Event.SyncAccountSyncNow)
-            // Trigger a sync.
-            accountManager.syncNow(SyncReason.User)
-            // Poll for device events & update devices.
-            accountManager.authenticatedAccount()
-                ?.deviceConstellation()?.run {
-                    refreshDevices()
-                    pollForCommands()
-                }
-        }.invokeOnCompletion {
-            store.dispatch(TabsTrayAction.SyncCompleted)
-        }
-    }
-
     private fun sendNewTabEvent(isPrivateModeSelected: Boolean) {
         val eventToSend = if (isPrivateModeSelected) {
             Event.NewPrivateTabTapped

app/src/main/java/org/mozilla/fenix/tabstray/TabsTrayFragment.kt

@@ -53,7 +53,6 @@ import org.mozilla.fenix.tabstray.browser.SelectionBannerBinding
 import org.mozilla.fenix.tabstray.browser.SelectionBannerBinding.VisibilityModifier
 import org.mozilla.fenix.tabstray.ext.getTrayPosition
 import org.mozilla.fenix.tabstray.ext.showWithTheme
-import org.mozilla.fenix.tabstray.syncedtabs.SyncedTabsInteractor
 import org.mozilla.fenix.utils.allowUndo
 import kotlin.math.max
 
@@ -111,6 +110,7 @@ class TabsTrayFragment : AppCompatDialogFragment(), TabsTrayInteractor {
         val navigationInteractor =
             DefaultNavigationInteractor(
                 context = requireContext(),
+                activity = activity,
                 tabsTrayStore = tabsTrayStore,
                 browserStore = requireComponents.core.store,
                 navController = findNavController(),
@@ -143,20 +143,13 @@ class TabsTrayFragment : AppCompatDialogFragment(), TabsTrayInteractor {
             requireComponents.analytics.metrics
         )
 
-        val syncedTabsTrayInteractor = SyncedTabsInteractor(
-            requireComponents.analytics.metrics,
-            requireActivity() as HomeActivity,
-            this,
-            controller = tabsTrayController
-        )
-
         setupMenu(view, navigationInteractor)
         setupPager(
             view.context,
             tabsTrayStore,
             this,
             browserTrayInteractor,
-            syncedTabsTrayInteractor
+            navigationInteractor
         )
 
         setupBackgroundDismissalListener {
@@ -216,8 +209,7 @@ class TabsTrayFragment : AppCompatDialogFragment(), TabsTrayInteractor {
                 store = tabsTrayStore,
                 settings = requireComponents.settings,
                 actionButton = new_tab_button,
-                browserTrayInteractor = browserTrayInteractor,
+                browserTrayInteractor = browserTrayInteractor
-                syncedTabsInteractor = syncedTabsTrayInteractor
             ),
             owner = this,
             view = view
@@ -228,8 +220,7 @@ class TabsTrayFragment : AppCompatDialogFragment(), TabsTrayInteractor {
                 store = tabsTrayStore,
                 settings = requireComponents.settings,
                 newTabButton = tab_tray_new_tab,
-                browserTrayInteractor = browserTrayInteractor,
+                browserTrayInteractor = browserTrayInteractor
-                syncedTabsInteractor = syncedTabsTrayInteractor
             ),
             owner = this,
             view = view
@@ -337,14 +328,14 @@ class TabsTrayFragment : AppCompatDialogFragment(), TabsTrayInteractor {
         store: TabsTrayStore,
         trayInteractor: TabsTrayInteractor,
         browserInteractor: BrowserTrayInteractor,
-        syncedTabsTrayInteractor: SyncedTabsInteractor
+        navigationInteractor: NavigationInteractor
     ) {
         tabsTray.apply {
             adapter = TrayPagerAdapter(
                 context,
                 store,
                 browserInteractor,
-                syncedTabsTrayInteractor,
+                navigationInteractor,
                 trayInteractor,
                 requireComponents.core.store
             )

app/src/main/java/org/mozilla/fenix/tabstray/TrayPagerAdapter.kt

@@ -12,10 +12,10 @@ import mozilla.components.browser.state.selector.normalTabs
 import mozilla.components.browser.state.selector.privateTabs
 import mozilla.components.browser.state.selector.selectedTab
 import mozilla.components.browser.state.store.BrowserStore
-import mozilla.components.feature.syncedtabs.view.SyncedTabsView
 import org.mozilla.fenix.sync.SyncedTabsAdapter
 import org.mozilla.fenix.tabstray.browser.BrowserTabsAdapter
 import org.mozilla.fenix.tabstray.browser.BrowserTrayInteractor
+import org.mozilla.fenix.tabstray.syncedtabs.TabClickDelegate
 import org.mozilla.fenix.tabstray.viewholders.AbstractTrayViewHolder
 import org.mozilla.fenix.tabstray.viewholders.NormalBrowserTabViewHolder
 import org.mozilla.fenix.tabstray.viewholders.PrivateBrowserTabViewHolder
@@ -25,14 +25,14 @@ class TrayPagerAdapter(
     private val context: Context,
     private val store: TabsTrayStore,
     private val browserInteractor: BrowserTrayInteractor,
-    private val syncedTabsInteractor: SyncedTabsView.Listener,
+    private val navInteractor: NavigationInteractor,
     private val interactor: TabsTrayInteractor,
     private val browserStore: BrowserStore
 ) : RecyclerView.Adapter<AbstractTrayViewHolder>() {
 
     private val normalAdapter by lazy { BrowserTabsAdapter(context, browserInteractor, store) }
     private val privateAdapter by lazy { BrowserTabsAdapter(context, browserInteractor, store) }
-    private val syncedTabsAdapter by lazy { SyncedTabsAdapter(syncedTabsInteractor) }
+    private val syncedTabsAdapter by lazy { SyncedTabsAdapter(TabClickDelegate(navInteractor)) }
 
     override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): AbstractTrayViewHolder {
         val itemView = LayoutInflater.from(parent.context).inflate(viewType, parent, false)
@@ -59,7 +59,7 @@ class TrayPagerAdapter(
             SyncedTabViewHolder.LAYOUT_ID -> {
                 SyncedTabViewHolder(
                     itemView,
-                    syncedTabsInteractor
+                    store
                 )
             }
             else -> throw IllegalStateException("Unknown viewType.")

app/src/main/java/org/mozilla/fenix/tabstray/syncedtabs/SyncButtonBinding.kt

@@ -0,0 +1,35 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.fenix.tabstray.syncedtabs
+
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.collect
+import kotlinx.coroutines.flow.map
+import mozilla.components.feature.syncedtabs.view.SyncedTabsView
+import mozilla.components.support.ktx.kotlinx.coroutines.flow.ifChanged
+import org.mozilla.fenix.components.AbstractBinding
+import org.mozilla.fenix.tabstray.TabsTrayState
+import org.mozilla.fenix.tabstray.TabsTrayStore
+
+/**
+ * An [AbstractBinding] that invokes the [onSyncNow] callback when the [TabsTrayState.syncing] is
+ * set.
+ *
+ * This binding is useful for connecting with [SyncedTabsView.Listener].
+ */
+class SyncButtonBinding(
+    tabsTrayStore: TabsTrayStore,
+    private val onSyncNow: () -> Unit
+) : AbstractBinding<TabsTrayState>(tabsTrayStore) {
+    override suspend fun onState(flow: Flow<TabsTrayState>) {
+        flow.map { it.syncing }
+            .ifChanged()
+            .collect { syncingNow ->
+                if (syncingNow) {
+                    onSyncNow()
+                }
+            }
+    }
+}

app/src/main/java/org/mozilla/fenix/tabstray/syncedtabs/SyncedTabsInteractor.kt

@@ -1,34 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-package org.mozilla.fenix.tabstray.syncedtabs
-
-import mozilla.components.browser.storage.sync.Tab
-import mozilla.components.feature.syncedtabs.view.SyncedTabsView
-import org.mozilla.fenix.BrowserDirection
-import org.mozilla.fenix.HomeActivity
-import org.mozilla.fenix.components.metrics.Event
-import org.mozilla.fenix.components.metrics.MetricController
-import org.mozilla.fenix.tabstray.TabsTrayController
-import org.mozilla.fenix.tabstray.TabsTrayInteractor
-
-class SyncedTabsInteractor(
-    private val metrics: MetricController,
-    private val activity: HomeActivity,
-    private val trayInteractor: TabsTrayInteractor,
-    private val controller: TabsTrayController
-) : SyncedTabsView.Listener {
-    override fun onRefresh() {
-        controller.onSyncStarted()
-    }
-    override fun onTabClicked(tab: Tab) {
-        metrics.track(Event.SyncedTabOpened)
-        activity.openToBrowserAndLoad(
-            searchTermOrURL = tab.active().url,
-            newTab = true,
-            from = BrowserDirection.FromTabTray
-        )
-        trayInteractor.navigateToBrowser()
-    }
-}

app/src/main/java/org/mozilla/fenix/tabstray/syncedtabs/SyncedTabsTrayLayout.kt

@@ -24,7 +24,9 @@ import org.mozilla.fenix.ext.components
 import org.mozilla.fenix.sync.SyncedTabsAdapter
 import org.mozilla.fenix.sync.ext.toAdapterItem
 import org.mozilla.fenix.sync.ext.toStringRes
+import org.mozilla.fenix.tabstray.TabsTrayAction
 import org.mozilla.fenix.tabstray.TabsTrayFragment
+import org.mozilla.fenix.tabstray.TabsTrayStore
 import org.mozilla.fenix.tabstray.TrayItem
 import org.mozilla.fenix.utils.view.LifecycleViewProvider
 
@@ -37,6 +39,7 @@ class SyncedTabsTrayLayout @JvmOverloads constructor(
 
     private val lifecycleProvider = LifecycleViewProvider(this)
     private val coroutineScope = CoroutineScope(Dispatchers.Main)
+
     private val syncedTabsFeature by lazy {
         SyncedTabsFeature(
             context = context,
@@ -52,6 +55,14 @@ class SyncedTabsTrayLayout @JvmOverloads constructor(
         )
     }
 
+    private val syncButtonBinding by lazy {
+        SyncButtonBinding(tabsTrayStore) {
+            listener?.onRefresh()
+        }
+    }
+
+    lateinit var tabsTrayStore: TabsTrayStore
+
     override var listener: SyncedTabsView.Listener? = null
 
     override fun displaySyncedTabs(syncedTabs: List<SyncedDeviceTabs>) {
@@ -79,33 +90,28 @@ class SyncedTabsTrayLayout @JvmOverloads constructor(
         }
     }
 
-    override fun startLoading() {
-        // TODO implement with https://github.com/mozilla-mobile/fenix/issues/18515
-        // start animating FAB
-        // interactor.syncingTabs(loading = true)
-    }
-
-    override fun stopLoading() {
-        // TODO implement with https://github.com/mozilla-mobile/fenix/issues/18515
-        // stop animating FAB
-        // interactor.syncingTabs(loading = false)
-    }
-
     override fun onAttachedToWindow() {
         super.onAttachedToWindow()
 
         syncedTabsFeature.start()
+        syncButtonBinding.start()
     }
 
     override fun onDetachedFromWindow() {
         super.onDetachedFromWindow()
 
         syncedTabsFeature.stop()
+        syncButtonBinding.stop()
+
         coroutineScope.cancel()
     }
 
-    fun onRefresh() {
+    override fun stopLoading() {
-        // TODO implement with https://github.com/mozilla-mobile/fenix/issues/18515
+        tabsTrayStore.dispatch(TabsTrayAction.SyncCompleted)
-        // syncedTabsFeature.interactor.onRefresh()
     }
+
+    /**
+     * Do nothing; the UI is handled with FloatingActionButtonBinding.
+     */
+    override fun startLoading() = Unit
 }

app/src/main/java/org/mozilla/fenix/tabstray/syncedtabs/TabClickDelegate.kt

@@ -0,0 +1,22 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.fenix.tabstray.syncedtabs
+
+import mozilla.components.browser.storage.sync.Tab
+import mozilla.components.feature.syncedtabs.view.SyncedTabsView
+import org.mozilla.fenix.tabstray.NavigationInteractor
+
+/**
+ * A wrapper class that handles tab clicks from a Synced Tabs list.
+ */
+class TabClickDelegate(
+    private val interactor: NavigationInteractor
+) : SyncedTabsView.Listener {
+    override fun onTabClicked(tab: Tab) {
+        interactor.onSyncedTabClicked(tab)
+    }
+
+    override fun onRefresh() = Unit
+}

app/src/main/java/org/mozilla/fenix/tabstray/viewholders/SyncedTabViewHolder.kt

@@ -7,12 +7,12 @@ package org.mozilla.fenix.tabstray.viewholders
 import android.view.View
 import androidx.recyclerview.widget.RecyclerView
 import kotlinx.android.synthetic.main.component_sync_tabs_tray_layout.*
-import mozilla.components.feature.syncedtabs.view.SyncedTabsView
 import org.mozilla.fenix.R
+import org.mozilla.fenix.tabstray.TabsTrayStore
 
 class SyncedTabViewHolder(
     containerView: View,
-    private val listener: SyncedTabsView.Listener
+    private val tabsTrayStore: TabsTrayStore
 ) : AbstractTrayViewHolder(containerView) {
 
     override fun bind(
@@ -21,7 +21,8 @@ class SyncedTabViewHolder(
     ) {
         synced_tabs_list.layoutManager = layoutManager
         synced_tabs_list.adapter = adapter
-        synced_tabs_tray_layout.listener = listener
+
+        synced_tabs_tray_layout.tabsTrayStore = tabsTrayStore
     }
 
     companion object {

app/src/main/java/org/mozilla/fenix/utils/view/LifecycleViewProvider.kt

@@ -14,7 +14,7 @@ import androidx.lifecycle.LifecycleRegistry
 /**
  * Provides a [LifecycleOwner] on a given [View] for features that function on lifecycle events.
  *
- * When the [View] is attached to the window, observers will receive the [Lifecycle.Event.ON_START] event.
+ * When the [View] is attached to the window, observers will receive the [Lifecycle.Event.ON_RESUME] event.
  * When the [View] is detached to the window, observers will receive the [Lifecycle.Event.ON_STOP] event.
  *
  * @param view The [View] that will be observed.
@@ -36,7 +36,7 @@ internal class ViewBinding(
     private val registry: LifecycleRegistry
 ) : View.OnAttachStateChangeListener {
     override fun onViewAttachedToWindow(v: View?) {
-        registry.currentState = State.STARTED
+        registry.currentState = State.RESUMED
     }
 
     override fun onViewDetachedFromWindow(v: View?) {

app/src/test/java/org/mozilla/fenix/tabstray/AccessibleNewTabButtonBindingTest.kt

@@ -20,7 +20,6 @@ import org.junit.Rule
 import org.junit.Test
 import org.mozilla.fenix.R
 import org.mozilla.fenix.tabstray.browser.BrowserTrayInteractor
-import org.mozilla.fenix.tabstray.syncedtabs.SyncedTabsInteractor
 import org.mozilla.fenix.utils.Settings
 
 class AccessibleNewTabButtonBindingTest {
@@ -32,7 +31,6 @@ class AccessibleNewTabButtonBindingTest {
     private val settings: Settings = mockk(relaxed = true)
     private val newTabButton: ImageButton = mockk(relaxed = true)
     private val browserTrayInteractor: BrowserTrayInteractor = mockk(relaxed = true)
-    private val syncedTabsInteractor: SyncedTabsInteractor = mockk(relaxed = true)
 
     @Before
     fun setup() {
@@ -44,7 +42,7 @@ class AccessibleNewTabButtonBindingTest {
     fun `WHEN tab selected page is normal tab THEN new tab button is visible`() {
         val tabsTrayStore = TabsTrayStore(TabsTrayState(selectedPage = Page.NormalTabs))
         val newTabButtonBinding = AccessibleNewTabButtonBinding(
-            tabsTrayStore, settings, newTabButton, browserTrayInteractor, syncedTabsInteractor
+            tabsTrayStore, settings, newTabButton, browserTrayInteractor
         )
         every { settings.accessibilityServicesEnabled } returns true
 
@@ -57,7 +55,7 @@ class AccessibleNewTabButtonBindingTest {
     fun `WHEN tab selected page is private tab THEN new tab button is visible`() {
         val tabsTrayStore = TabsTrayStore(TabsTrayState(selectedPage = Page.PrivateTabs))
         val newTabButtonBinding = AccessibleNewTabButtonBinding(
-            tabsTrayStore, settings, newTabButton, browserTrayInteractor, syncedTabsInteractor
+            tabsTrayStore, settings, newTabButton, browserTrayInteractor
         )
         every { settings.accessibilityServicesEnabled } returns true
 
@@ -70,7 +68,7 @@ class AccessibleNewTabButtonBindingTest {
     fun `WHEN tab selected page is sync tab THEN new tab button is visible`() {
         val tabsTrayStore = TabsTrayStore(TabsTrayState(selectedPage = Page.SyncedTabs))
         val newTabButtonBinding = AccessibleNewTabButtonBinding(
-            tabsTrayStore, settings, newTabButton, browserTrayInteractor, syncedTabsInteractor
+            tabsTrayStore, settings, newTabButton, browserTrayInteractor
         )
         every { settings.accessibilityServicesEnabled } returns true
 
@@ -83,7 +81,7 @@ class AccessibleNewTabButtonBindingTest {
     fun `WHEN accessibility is disabled THEN new tab button is not visible`() {
         var tabsTrayStore = TabsTrayStore(TabsTrayState(selectedPage = Page.NormalTabs))
         var newTabButtonBinding = AccessibleNewTabButtonBinding(
-            tabsTrayStore, settings, newTabButton, browserTrayInteractor, syncedTabsInteractor
+            tabsTrayStore, settings, newTabButton, browserTrayInteractor
         )
         every { settings.accessibilityServicesEnabled } returns false
 
@@ -93,7 +91,7 @@ class AccessibleNewTabButtonBindingTest {
 
         tabsTrayStore = TabsTrayStore(TabsTrayState(selectedPage = Page.PrivateTabs))
         newTabButtonBinding = AccessibleNewTabButtonBinding(
-            tabsTrayStore, settings, newTabButton, browserTrayInteractor, syncedTabsInteractor
+            tabsTrayStore, settings, newTabButton, browserTrayInteractor
         )
 
         newTabButtonBinding.start()
@@ -102,7 +100,7 @@ class AccessibleNewTabButtonBindingTest {
 
         tabsTrayStore = TabsTrayStore(TabsTrayState(selectedPage = Page.SyncedTabs))
         newTabButtonBinding = AccessibleNewTabButtonBinding(
-            tabsTrayStore, settings, newTabButton, browserTrayInteractor, syncedTabsInteractor
+            tabsTrayStore, settings, newTabButton, browserTrayInteractor
         )
 
         newTabButtonBinding.start()
@@ -114,7 +112,7 @@ class AccessibleNewTabButtonBindingTest {
     fun `WHEN selected page is updated THEN button is updated`() {
         val tabsTrayStore = TabsTrayStore(TabsTrayState(selectedPage = Page.NormalTabs))
         val newTabButtonBinding = AccessibleNewTabButtonBinding(
-            tabsTrayStore, settings, newTabButton, browserTrayInteractor, syncedTabsInteractor
+            tabsTrayStore, settings, newTabButton, browserTrayInteractor
         )
         every { settings.accessibilityServicesEnabled } returns true
 

app/src/test/java/org/mozilla/fenix/tabstray/FloatingActionButtonBindingTest.kt

@@ -19,7 +19,6 @@ import org.junit.Rule
 import org.junit.Test
 import org.mozilla.fenix.R
 import org.mozilla.fenix.tabstray.browser.BrowserTrayInteractor
-import org.mozilla.fenix.tabstray.syncedtabs.SyncedTabsInteractor
 import org.mozilla.fenix.utils.Settings
 
 class FloatingActionButtonBindingTest {
@@ -31,7 +30,6 @@ class FloatingActionButtonBindingTest {
     private val settings: Settings = mockk(relaxed = true)
     private val actionButton: ExtendedFloatingActionButton = mockk(relaxed = true)
     private val browserTrayInteractor: BrowserTrayInteractor = mockk(relaxed = true)
-    private val syncedTabsInteractor: SyncedTabsInteractor = mockk(relaxed = true)
 
     @Before
     fun setup() {
@@ -43,7 +41,7 @@ class FloatingActionButtonBindingTest {
     fun `WHEN tab selected page is normal tab THEN shrink and show is called`() {
         val tabsTrayStore = TabsTrayStore(TabsTrayState(selectedPage = Page.NormalTabs))
         val fabBinding = FloatingActionButtonBinding(
-            tabsTrayStore, settings, actionButton, browserTrayInteractor, syncedTabsInteractor
+            tabsTrayStore, settings, actionButton, browserTrayInteractor
         )
         every { settings.accessibilityServicesEnabled } returns false
 
@@ -59,7 +57,7 @@ class FloatingActionButtonBindingTest {
     fun `WHEN tab selected page is private tab THEN extend and show is called`() {
         val tabsTrayStore = TabsTrayStore(TabsTrayState(selectedPage = Page.PrivateTabs))
         val fabBinding = FloatingActionButtonBinding(
-            tabsTrayStore, settings, actionButton, browserTrayInteractor, syncedTabsInteractor
+            tabsTrayStore, settings, actionButton, browserTrayInteractor
         )
         every { settings.accessibilityServicesEnabled } returns false
 
@@ -75,7 +73,7 @@ class FloatingActionButtonBindingTest {
     fun `WHEN tab selected page is sync tab THEN extend and show is called`() {
         val tabsTrayStore = TabsTrayStore(TabsTrayState(selectedPage = Page.SyncedTabs))
         val fabBinding = FloatingActionButtonBinding(
-            tabsTrayStore, settings, actionButton, browserTrayInteractor, syncedTabsInteractor
+            tabsTrayStore, settings, actionButton, browserTrayInteractor
         )
         every { settings.accessibilityServicesEnabled } returns false
 
@@ -91,7 +89,7 @@ class FloatingActionButtonBindingTest {
     fun `WHEN accessibility is enabled THEN show is not called`() {
         var tabsTrayStore = TabsTrayStore(TabsTrayState(selectedPage = Page.NormalTabs))
         var fabBinding = FloatingActionButtonBinding(
-            tabsTrayStore, settings, actionButton, browserTrayInteractor, syncedTabsInteractor
+            tabsTrayStore, settings, actionButton, browserTrayInteractor
         )
         every { settings.accessibilityServicesEnabled } returns true
 
@@ -102,7 +100,7 @@ class FloatingActionButtonBindingTest {
 
         tabsTrayStore = TabsTrayStore(TabsTrayState(selectedPage = Page.PrivateTabs))
         fabBinding = FloatingActionButtonBinding(
-            tabsTrayStore, settings, actionButton, browserTrayInteractor, syncedTabsInteractor
+            tabsTrayStore, settings, actionButton, browserTrayInteractor
         )
 
         fabBinding.start()
@@ -112,7 +110,7 @@ class FloatingActionButtonBindingTest {
 
         tabsTrayStore = TabsTrayStore(TabsTrayState(selectedPage = Page.SyncedTabs))
         fabBinding = FloatingActionButtonBinding(
-            tabsTrayStore, settings, actionButton, browserTrayInteractor, syncedTabsInteractor
+            tabsTrayStore, settings, actionButton, browserTrayInteractor
         )
 
         fabBinding.start()
@@ -125,7 +123,7 @@ class FloatingActionButtonBindingTest {
     fun `WHEN selected page is updated THEN button is updated`() {
         val tabsTrayStore = TabsTrayStore(TabsTrayState(selectedPage = Page.NormalTabs))
         val fabBinding = FloatingActionButtonBinding(
-            tabsTrayStore, settings, actionButton, browserTrayInteractor, syncedTabsInteractor
+            tabsTrayStore, settings, actionButton, browserTrayInteractor
         )
         every { settings.accessibilityServicesEnabled } returns false
 

app/src/test/java/org/mozilla/fenix/tabstray/NavigationInteractorTest.kt

@@ -20,6 +20,8 @@ import mozilla.components.browser.state.state.BrowserState
 import mozilla.components.browser.state.state.TabSessionState
 import mozilla.components.browser.state.state.createTab as createStateTab
 import mozilla.components.browser.state.store.BrowserStore
+import mozilla.components.browser.storage.sync.TabEntry
+import mozilla.components.browser.storage.sync.Tab as SyncTab
 import mozilla.components.concept.tabstray.Tab
 import mozilla.components.service.fxa.manager.FxaAccountManager
 import mozilla.components.support.test.rule.MainCoroutineRule
@@ -27,6 +29,8 @@ import org.junit.Assert.assertTrue
 import org.junit.Before
 import org.junit.Rule
 import org.junit.Test
+import org.mozilla.fenix.BrowserDirection
+import org.mozilla.fenix.HomeActivity
 import org.mozilla.fenix.collections.CollectionsDialog
 import org.mozilla.fenix.collections.show
 import org.mozilla.fenix.components.TabCollectionStorage
@@ -50,6 +54,7 @@ class NavigationInteractorTest {
     private val context: Context = mockk(relaxed = true)
     private val collectionStorage: TabCollectionStorage = mockk(relaxed = true)
     private val accountManager: FxaAccountManager = mockk(relaxed = true)
+    private val activity: HomeActivity = mockk(relaxed = true)
 
     private val testDispatcher = TestCoroutineDispatcher()
 
@@ -65,6 +70,7 @@ class NavigationInteractorTest {
         tabsTrayStore = TabsTrayStore()
         navigationInteractor = DefaultNavigationInteractor(
             context,
+            activity,
             store,
             navController,
             metrics,
@@ -89,6 +95,7 @@ class NavigationInteractorTest {
         var onShareTabs = false
         var onSaveToCollections = false
         var onBookmarkTabs = false
+        var onSyncedTabsClicked = false
 
         class TestNavigationInteractor : NavigationInteractor {
 
@@ -120,6 +127,10 @@ class NavigationInteractorTest {
                 onBookmarkTabs = true
             }
 
+            override fun onSyncedTabClicked(tab: mozilla.components.browser.storage.sync.Tab) {
+                onSyncedTabsClicked = true
+            }
+
             override fun onShareTabsOfTypeClicked(private: Boolean) {
                 shareTabsOfTypeClicked = true
             }
@@ -148,6 +159,8 @@ class NavigationInteractorTest {
         assertTrue(onSaveToCollections)
         navigationInteractor.onSaveToBookmarks(emptyList())
         assertTrue(onBookmarkTabs)
+        navigationInteractor.onSyncedTabClicked(mockk())
+        assertTrue(onSyncedTabsClicked)
     }
 
     @Test
@@ -219,6 +232,7 @@ class NavigationInteractorTest {
     fun `onBookmarkTabs calls navigation on DefaultNavigationInteractor`() = runBlockingTest {
         navigationInteractor = DefaultNavigationInteractor(
             context,
+            activity,
             store,
             navController,
             metrics,
@@ -233,4 +247,24 @@ class NavigationInteractorTest {
         navigationInteractor.onSaveToBookmarks(listOf(createTrayTab()))
         coVerify(exactly = 1) { bookmarksUseCase.addBookmark(any(), any(), any()) }
     }
+
+    @Test
+    fun `onSyncedTabsClicked sets metrics and opens browser`() {
+        val tab = mockk<SyncTab>()
+        val entry = mockk<TabEntry>()
+
+        every { tab.active() }.answers { entry }
+        every { entry.url }.answers { "https://mozilla.org" }
+
+        navigationInteractor.onSyncedTabClicked(tab)
+
+        verify { metrics.track(Event.SyncedTabOpened) }
+        verify {
+            activity.openToBrowserAndLoad(
+                searchTermOrURL = "https://mozilla.org",
+                newTab = true,
+                from = BrowserDirection.FromTabTray
+            )
+        }
+    }
 }

app/src/test/java/org/mozilla/fenix/tabstray/syncedtabs/SyncButtonBindingTest.kt

@@ -0,0 +1,54 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.fenix.tabstray.syncedtabs
+
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.test.TestCoroutineDispatcher
+import mozilla.components.support.test.libstate.ext.waitUntilIdle
+import mozilla.components.support.test.rule.MainCoroutineRule
+import org.junit.Assert.assertFalse
+import org.junit.Assert.assertTrue
+import org.junit.Rule
+import org.junit.Test
+import org.mozilla.fenix.tabstray.TabsTrayAction
+import org.mozilla.fenix.tabstray.TabsTrayStore
+
+class SyncButtonBindingTest {
+    @OptIn(ExperimentalCoroutinesApi::class)
+    @get:Rule
+    val coroutinesTestRule = MainCoroutineRule(TestCoroutineDispatcher())
+
+    @Test
+    fun `WHEN syncing state is true THEN invoke callback`() {
+        var invoked = false
+        val store = TabsTrayStore()
+        val binding = SyncButtonBinding(store) { invoked = true }
+
+        binding.start()
+
+        store.dispatch(TabsTrayAction.SyncNow)
+        store.waitUntilIdle()
+
+        assertTrue(invoked)
+    }
+
+    @Test
+    fun `WHEN syncing state is false THEN nothing is invoked`() {
+        var invoked = false
+        val store = TabsTrayStore()
+        val binding = SyncButtonBinding(store) { invoked = true }
+
+        binding.start()
+
+        store.waitUntilIdle()
+
+        assertFalse(invoked)
+
+        store.dispatch(TabsTrayAction.SyncCompleted)
+        store.waitUntilIdle()
+
+        assertFalse(invoked)
+    }
+}

app/src/test/java/org/mozilla/fenix/tabstray/syncedtabs/TabClickDelegateTest.kt

@@ -0,0 +1,36 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.fenix.tabstray.syncedtabs
+
+import io.mockk.Called
+import io.mockk.mockk
+import io.mockk.verify
+import mozilla.components.browser.storage.sync.Tab
+import org.junit.Test
+import org.mozilla.fenix.tabstray.NavigationInteractor
+
+class TabClickDelegateTest {
+
+    private val interactor = mockk<NavigationInteractor>(relaxed = true)
+    private val tab = mockk<Tab>()
+
+    @Test
+    fun `WHEN tab is clicked THEN invoke the interactor`() {
+        val delegate = TabClickDelegate(interactor)
+
+        delegate.onTabClicked(tab)
+
+        verify { interactor.onSyncedTabClicked(tab) }
+    }
+
+    @Test
+    fun `WHEN refresh is invoked THEN do nothing`() {
+        val delegate = TabClickDelegate(interactor)
+
+        delegate.onRefresh()
+
+        verify { interactor wasNot Called }
+    }
+}