[fenix] Issue mozilla-mobilehttps://github.com/mozilla-mobile/fenix/issues/21140 - Updated recent tab logic to show media tab and second-to-last tab, if the media tab was the last active tab. (https://github.com/mozilla-mobile/fenix/pull/21141)

* Issue mozilla-mobilehttps://github.com/mozilla-mobile/fenix/issues/21140 - Updated recent tab logic to show media tab and second-to-last tab, if the media tab was the last active tab.

* Fixed RecentTabsListFeatureTest unit test

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

app/src/main/java/org/mozilla/fenix/ext/BrowserState.kt

@@ -19,12 +19,15 @@ import mozilla.components.feature.tabs.ext.hasMediaPlayed
 fun BrowserState.asRecentTabs(): List<TabSessionState> {
     return mutableListOf<TabSessionState>().apply {
         val lastOpenedNormalTab = lastOpenedNormalTab
+        val inProgressMediaTab = inProgressMediaTab
+
         lastOpenedNormalTab?.let { add(it) }
-        inProgressMediaTab
-            ?.takeUnless { it == lastOpenedNormalTab }
-            ?.let {
-                add(it)
-            }
+
+        if (inProgressMediaTab == lastOpenedNormalTab) {
+            secondToLastOpenedNormalTab?.let { add(it) }
+        } else {
+            inProgressMediaTab?.let { add(it) }
+        }
     }
 }
 
@@ -35,6 +38,15 @@ fun BrowserState.asRecentTabs(): List<TabSessionState> {
 val BrowserState.lastOpenedNormalTab: TabSessionState?
     get() = selectedNormalTab ?: normalTabs.maxByOrNull { it.lastAccess }
 
+/**
+ *  Get the second-to-last accessed normal tab.
+ */
+val BrowserState.secondToLastOpenedNormalTab: TabSessionState?
+    get() = when {
+        normalTabs.size <= 1 -> null
+        else -> normalTabs.sortedByDescending { it.lastAccess }[1]
+    }
+
 /**
  * Get the last tab with in progress media.
  */

app/src/test/java/org/mozilla/fenix/ext/BrowserStateTest.kt

@@ -114,7 +114,7 @@ class BrowserStateTest {
     }
 
     @Test
-    fun `GIVEN the selected tab is a private tab and the media tab is the last accessed normal tab WHEN asRecentTabs is called THEN a list of the media tab`() {
+    fun `GIVEN the selected tab is a private tab and the media tab is the last accessed normal tab WHEN asRecentTabs is called THEN return a list of the media tab and the second-to-last normal tab`() {
         val selectedPrivateTab = createTab(url = "url", id = "1", lastAccess = 1, private = true)
         val normalTab = createTab(url = "url2", id = "2", lastAccess = 2)
         val mediaTab = createTab(
@@ -128,7 +128,7 @@ class BrowserStateTest {
 
         val result = browserState.asRecentTabs()
 
-        assertEquals(1, result.size)
+        assertEquals(2, result.size)
         assertEquals(mediaTab, result[0])
     }
 
@@ -168,4 +168,43 @@ class BrowserStateTest {
 
         assertEquals(normalTab1, browserState.lastOpenedNormalTab)
     }
+
+    @Test
+    fun `GIVEN no normal tabs are open WHEN secondToLastOpenedNormalTab is called THEN return null`() {
+        val browserState = BrowserState(
+            tabs = listOf(mockk(relaxed = true)),
+        )
+        assertNull(browserState.secondToLastOpenedNormalTab)
+    }
+
+    @Test
+    fun `GIVEN one normal tab is open WHEN secondToLastOpenedNormalTab is called THEN return the one tab`() {
+        val lastAccessedNormalTab = createTab(url = "url2", id = "2", lastAccess = 1)
+        val browserState = BrowserState(
+            tabs = listOf(lastAccessedNormalTab),
+        )
+        assertNull(browserState.secondToLastOpenedNormalTab)
+    }
+
+    @Test
+    fun `GIVEN two normal tabs are open WHEN secondToLastOpenedNormalTab is called THEN return the second-to-last opened tab`() {
+        val normalTab1 = createTab(url = "url1", id = "1", lastAccess = 1)
+        val normalTab2 = createTab(url = "url2", id = "2", lastAccess = 2)
+        val browserState = BrowserState(
+            tabs = listOf(normalTab1, normalTab2),
+        )
+        assertEquals(normalTab1.id, browserState.secondToLastOpenedNormalTab!!.id)
+    }
+
+    @Test
+    fun `GIVEN four normal tabs are open WHEN secondToLastOpenedNormalTab is called THEN return the second-to-last opened tab`() {
+        val normalTab1 = createTab(url = "url1", id = "1", lastAccess = 1)
+        val normalTab2 = createTab(url = "url2", id = "2", lastAccess = 4)
+        val normalTab3 = createTab(url = "url3", id = "3", lastAccess = 3)
+        val normalTab4 = createTab(url = "url4", id = "4", lastAccess = 2)
+        val browserState = BrowserState(
+            tabs = listOf(normalTab1, normalTab2, normalTab3, normalTab4),
+        )
+        assertEquals(normalTab3.id, browserState.secondToLastOpenedNormalTab!!.id)
+    }
 }

app/src/test/java/org/mozilla/fenix/home/RecentTabsListFeatureTest.kt

@@ -226,7 +226,7 @@ class RecentTabsListFeatureTest {
 
         feature.start()
         homeStore.waitUntilIdle()
-        assertEquals(1, homeStore.state.recentTabs.size)
+        assertEquals(2, homeStore.state.recentTabs.size)
         assertEquals(initialMediaTab, homeStore.state.recentTabs[0])
 
         browserStore.dispatch(