Added test for OnDeckSelected.

Author: Haz3-jolt

AnkiDroid/src/main/java/com/ichi2/anki/CardBrowser.kt

@@ -120,7 +120,6 @@ open class CardBrowser :
     ChangeManager.Subscriber,
     ExportDialogsFactoryProvider {
 
-    @NeedsTest("15448: double-selecting deck does nothing")
     override fun onDeckSelected(deck: SelectableDeck?) {
         deck?.let {
             launchCatchingTask { selectDeckAndSave(deck.deckId) }

AnkiDroid/src/test/java/com/ichi2/anki/CardBrowserTest.kt

@@ -34,6 +34,7 @@ import com.ichi2.anki.browser.CardBrowserColumn
 import com.ichi2.anki.browser.CardBrowserViewModel
 import com.ichi2.anki.browser.CardBrowserViewModel.Companion.DISPLAY_COLUMN_1_KEY
 import com.ichi2.anki.browser.CardBrowserViewModel.Companion.DISPLAY_COLUMN_2_KEY
+import com.ichi2.anki.dialogs.DeckSelectionDialog
 import com.ichi2.anki.model.CardsOrNotes.*
 import com.ichi2.anki.model.SortType
 import com.ichi2.anki.scheduling.ForgetCardsViewModel
@@ -136,6 +137,26 @@ class CardBrowserTest : RobolectricTest() {
         assertThat(browser.isShowingSelectAll, equalTo(true))
     }
 
+    @Test
+    fun testOnDeckSelected() = runBlocking {
+        // Arrange
+        val deckId = 123L
+        val selectableDeck = DeckSelectionDialog.SelectableDeck(deckId, "Test Deck")
+        val cardBrowser = getBrowserWithNotes(1)
+
+        // Act
+        cardBrowser.onDeckSelected(selectableDeck)
+
+        // Assert
+        assertEquals(deckId, cardBrowser.lastDeckId)
+
+        // Act again: select the same deck
+        cardBrowser.onDeckSelected(selectableDeck)
+
+        // Assert again: the deck selection should not change
+        assertEquals(deckId, cardBrowser.lastDeckId)
+    }
+
     @Test
     @Flaky(os = OS.WINDOWS, "Index 0 out of bounds for length 0")
     fun browserIsInMultiSelectModeWhenSelectingOne() {