Added the test for empty state and refactor

feature/bookmarks/src/androidTest/java/com/google/samples/apps/nowinandroid/feature/bookmarks/BookmarksScreenTest.kt

@@ -17,7 +17,6 @@
 package com.google.samples.apps.nowinandroid.feature.bookmarks
 
 import androidx.activity.ComponentActivity
-import androidx.compose.material3.windowsizeclass.WindowSizeClass
 import androidx.compose.ui.test.assertCountEquals
 import androidx.compose.ui.test.assertHasClickAction
 import androidx.compose.ui.test.filter
@@ -34,10 +33,11 @@ import androidx.compose.ui.test.performScrollToNode
 import com.google.samples.apps.nowinandroid.core.domain.model.SaveableNewsResource
 import com.google.samples.apps.nowinandroid.core.model.data.previewNewsResources
 import com.google.samples.apps.nowinandroid.core.ui.NewsFeedUiState
-import kotlin.test.assertEquals
-import kotlin.test.assertTrue
+import com.google.samples.apps.nowinandroid.core.ui.R.string
 import org.junit.Rule
 import org.junit.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertTrue
 
 /**
  * UI tests for [BookmarksScreen] composable.
@@ -65,8 +65,6 @@ class BookmarksScreenTest {
 
     @Test
     fun feed_whenHasBookmarks_showsBookmarks() {
-        lateinit var windowSizeClass: WindowSizeClass
-
         composeTestRule.setContent {
             BookmarksScreen(
                 feedState = NewsFeedUiState.Success(
@@ -120,11 +118,8 @@ class BookmarksScreenTest {
         }
 
         composeTestRule
-            .onAllNodesWithContentDescription(
-                composeTestRule.activity.getString(
-                    com.google.samples.apps.nowinandroid.core.ui.R.string.unbookmark
-                )
-            ).filter(
+            .onAllNodesWithContentDescription(composeTestRule.activity.getString(string.unbookmark))
+            .filter(
                 hasAnyAncestor(
                     hasText(
                         previewNewsResources[0].title,
@@ -138,4 +133,26 @@ class BookmarksScreenTest {
 
         assertTrue(removeFromBookmarksCalled)
     }
+
+    @Test
+    fun feed_whenHasNoBookmarks_showsEmptyState() {
+        composeTestRule.setContent {
+            BookmarksScreen(
+                feedState = NewsFeedUiState.Success(emptyList()),
+                removeFromBookmarks = { }
+            )
+        }
+
+        composeTestRule
+            .onNodeWithText(
+                composeTestRule.activity.getString(R.string.bookmarks_empty_error)
+            )
+            .assertExists()
+
+        composeTestRule
+            .onNodeWithText(
+                composeTestRule.activity.getString(R.string.bookmarks_empty_description)
+            )
+            .assertExists()
+    }
 }