diff --git a/app/src/test/java/org/kiwix/kiwixmobile/zimManager/ZimManageViewModelTest.kt b/app/src/test/java/org/kiwix/kiwixmobile/zimManager/ZimManageViewModelTest.kt
index 68f3f3a6f8..4810efdc5f 100644
--- a/app/src/test/java/org/kiwix/kiwixmobile/zimManager/ZimManageViewModelTest.kt
+++ b/app/src/test/java/org/kiwix/kiwixmobile/zimManager/ZimManageViewModelTest.kt
@@ -47,6 +47,7 @@ import org.kiwix.kiwixmobile.core.downloader.model.DownloadModel
 import org.kiwix.kiwixmobile.core.entity.LibraryNetworkEntity.Book
 import org.kiwix.kiwixmobile.core.utils.BookUtils
 import org.kiwix.kiwixmobile.core.utils.SharedPreferenceUtil
+import org.kiwix.kiwixmobile.core.utils.files.ScanningProgressListener
 import org.kiwix.kiwixmobile.core.zim_manager.Language
 import org.kiwix.kiwixmobile.core.zim_manager.fileselect_view.SelectionMode.MULTI
 import org.kiwix.kiwixmobile.core.zim_manager.fileselect_view.SelectionMode.NORMAL
@@ -128,7 +129,11 @@ class ZimManageViewModelTest {
     every { connectivityBroadcastReceiver.action } returns "test"
     every { downloadDao.downloads() } returns downloads
     every { newBookDao.books() } returns books
-    every { storageObserver.booksOnFileSystem } returns booksOnFileSystem
+    every {
+      storageObserver.getBooksOnFileSystem(
+        any<ScanningProgressListener>()
+      )
+    } returns booksOnFileSystem
     every { newLanguagesDao.languages() } returns languages
     every { fat32Checker.fileSystemStates } returns fileSystemStates
     every { connectivityBroadcastReceiver.networkStates } returns networkStates
diff --git a/core/src/test/java/org/kiwix/kiwixmobile/core/StorageObserverTest.kt b/core/src/test/java/org/kiwix/kiwixmobile/core/StorageObserverTest.kt
index bc85ba3fb6..8ba316a9d8 100644
--- a/core/src/test/java/org/kiwix/kiwixmobile/core/StorageObserverTest.kt
+++ b/core/src/test/java/org/kiwix/kiwixmobile/core/StorageObserverTest.kt
@@ -33,6 +33,7 @@ import org.kiwix.kiwixmobile.core.reader.ZimFileReader
 import org.kiwix.kiwixmobile.core.reader.ZimFileReader.Factory
 import org.kiwix.kiwixmobile.core.utils.SharedPreferenceUtil
 import org.kiwix.kiwixmobile.core.utils.files.FileSearch
+import org.kiwix.kiwixmobile.core.utils.files.ScanningProgressListener
 import org.kiwix.sharedFunctions.book
 import org.kiwix.sharedFunctions.bookOnDisk
 import org.kiwix.sharedFunctions.resetSchedulers
@@ -48,6 +49,7 @@ class StorageObserverTest {
   private val file: File = mockk()
   private val readerFactory: Factory = mockk()
   private val zimFileReader: ZimFileReader = mockk()
+  private val scanningProgressListener: ScanningProgressListener = mockk()
 
   private val files: PublishProcessor<List<File>> = PublishProcessor.create()
   private val downloads: PublishProcessor<List<DownloadModel>> = PublishProcessor.create()
@@ -66,7 +68,7 @@ class StorageObserverTest {
   @BeforeEach fun init() {
     clearAllMocks()
     every { sharedPreferenceUtil.prefStorage } returns "a"
-    every { fileSearch.scan() } returns files
+    every { fileSearch.scan(scanningProgressListener) } returns files
     every { downloadDao.downloads() } returns downloads
     every { readerFactory.create(file) } returns zimFileReader
     storageObserver = StorageObserver(downloadDao, fileSearch, readerFactory)
@@ -92,7 +94,7 @@ class StorageObserverTest {
     verify { zimFileReader.dispose() }
   }
 
-  private fun booksOnFileSystem() = storageObserver.booksOnFileSystem
+  private fun booksOnFileSystem() = storageObserver.getBooksOnFileSystem(scanningProgressListener)
     .test()
     .also {
       downloads.offer(listOf(downloadModel))
diff --git a/core/src/test/java/org/kiwix/kiwixmobile/core/utils/files/FileSearchTest.kt b/core/src/test/java/org/kiwix/kiwixmobile/core/utils/files/FileSearchTest.kt
index 78167b6f56..3b1daad41c 100644
--- a/core/src/test/java/org/kiwix/kiwixmobile/core/utils/files/FileSearchTest.kt
+++ b/core/src/test/java/org/kiwix/kiwixmobile/core/utils/files/FileSearchTest.kt
@@ -47,6 +47,7 @@ class FileSearchTest {
   private val externalStorageDirectory: File = mockk()
   private val contentResolver: ContentResolver = mockk()
   private val storageDevice: StorageDevice = mockk()
+  private val scanningProgressListener: ScanningProgressListener = mockk()
 
   init {
     setScheduler(Schedulers.trampoline())
@@ -80,7 +81,7 @@ class FileSearchTest {
     @Test
     fun `scan of directory that doesn't exist returns nothing`() {
       every { contentResolver.query(any(), any(), any(), any(), any()) } returns null
-      fileSearch.scan()
+      fileSearch.scan(scanningProgressListener)
         .test()
         .assertValue(listOf())
     }
@@ -92,7 +93,7 @@ class FileSearchTest {
       File.createTempFile("willNotFind", ".txt")
       every { contentResolver.query(any(), any(), any(), any(), any()) } returns null
       every { storageDevice.name } returns zimFile.parent
-      val fileList = fileSearch.scan()
+      val fileList = fileSearch.scan(scanningProgressListener)
         .test()
         .values()[0]
       assertThat(fileList).containsExactlyInAnyOrder(zimFile, zimaaFile)
@@ -109,7 +110,7 @@ class FileSearchTest {
       )
       every { contentResolver.query(any(), any(), any(), any(), any()) } returns null
       every { storageDevice.name } returns zimFile.parentFile.parent
-      val fileList = fileSearch.scan()
+      val fileList = fileSearch.scan(scanningProgressListener)
         .test()
         .values()[0]
       assertThat(fileList).containsExactlyInAnyOrder(zimFile)
@@ -123,7 +124,7 @@ class FileSearchTest {
     fun `scan media store, if files are readable they are returned`() {
       val fileToFind = File.createTempFile("fileToFind", ".zim")
       expectFromMediaStore(fileToFind)
-      fileSearch.scan()
+      fileSearch.scan(scanningProgressListener)
         .test()
         .assertValue(listOf(fileToFind))
     }
@@ -133,7 +134,7 @@ class FileSearchTest {
       val unreadableFile = File.createTempFile("fileToFind", ".zim")
       expectFromMediaStore(unreadableFile)
       unreadableFile.delete()
-      fileSearch.scan()
+      fileSearch.scan(scanningProgressListener)
         .test()
         .assertValue(listOf())
     }