diff --git a/app/src/main/java/org/mozilla/fenix/components/searchengine/CustomSearchEngineStore.kt b/app/src/main/java/org/mozilla/fenix/components/searchengine/CustomSearchEngineStore.kt
index 34650f5fb..93fd030e1 100644
--- a/app/src/main/java/org/mozilla/fenix/components/searchengine/CustomSearchEngineStore.kt
+++ b/app/src/main/java/org/mozilla/fenix/components/searchengine/CustomSearchEngineStore.kt
@@ -6,6 +6,7 @@ package org.mozilla.fenix.components.searchengine
 
 import android.content.Context
 import android.content.SharedPreferences
+import androidx.annotation.VisibleForTesting
 import mozilla.components.browser.icons.IconRequest
 import mozilla.components.browser.search.SearchEngine
 import mozilla.components.browser.search.SearchEngineParser
@@ -126,5 +127,6 @@ object CustomSearchEngineStore {
     }
 
     private const val PREF_KEY_CUSTOM_SEARCH_ENGINES = "pref_custom_search_engines"
-    private const val PREF_FILE_SEARCH_ENGINES = "custom-search-engines"
+    @VisibleForTesting
+    const val PREF_FILE_SEARCH_ENGINES = "custom-search-engines"
 }
diff --git a/app/src/test/java/org/mozilla/fenix/search/SearchInteractorTest.kt b/app/src/test/java/org/mozilla/fenix/search/SearchInteractorTest.kt
index f0738cf9d..a83c8a217 100644
--- a/app/src/test/java/org/mozilla/fenix/search/SearchInteractorTest.kt
+++ b/app/src/test/java/org/mozilla/fenix/search/SearchInteractorTest.kt
@@ -13,8 +13,8 @@ import io.mockk.Runs
 import io.mockk.every
 import io.mockk.just
 import io.mockk.mockk
-import io.mockk.mockkObject
 import io.mockk.verify
+import io.mockk.mockkObject
 import mozilla.components.browser.search.SearchEngine
 import mozilla.components.browser.search.SearchEngineManager
 import mozilla.components.browser.session.Session
@@ -23,9 +23,10 @@ import org.junit.Test
 import org.junit.runner.RunWith
 import org.mozilla.fenix.BrowserDirection
 import org.mozilla.fenix.FenixApplication
+import org.mozilla.fenix.TestApplication
 import org.mozilla.fenix.HomeActivity
 import org.mozilla.fenix.R
-import org.mozilla.fenix.TestApplication
+import org.mozilla.fenix.components.searchengine.CustomSearchEngineStore.PREF_FILE_SEARCH_ENGINES
 import org.mozilla.fenix.ext.metrics
 import org.mozilla.fenix.ext.searchEngineManager
 import org.mozilla.fenix.ext.settings
@@ -52,6 +53,13 @@ class SearchInteractorTest {
         every { state.session } returns null
         every { state.searchEngineSource } returns searchEngine
 
+        every {
+            context.getSharedPreferences(
+                PREF_FILE_SEARCH_ENGINES,
+                Context.MODE_PRIVATE
+            )
+        } returns mockk(relaxed = true)
+
         val searchController: SearchController = DefaultSearchController(
             context,
             store,
@@ -121,12 +129,21 @@ class SearchInteractorTest {
         val context: HomeActivity = mockk()
         val store: SearchFragmentStore = mockk()
         val state: SearchFragmentState = mockk()
+        val searchEngine = SearchEngineSource.Default(mockk(relaxed = true))
 
         every { context.metrics } returns mockk(relaxed = true)
         every { context.openToBrowserAndLoad(any(), any(), any()) } just Runs
 
         every { store.state } returns state
         every { state.session } returns null
+        every { state.searchEngineSource } returns searchEngine
+
+        every {
+            context.getSharedPreferences(
+                PREF_FILE_SEARCH_ENGINES,
+                Context.MODE_PRIVATE
+            )
+        } returns mockk(relaxed = true)
 
         val searchController: SearchController = DefaultSearchController(
             context,
@@ -162,6 +179,13 @@ class SearchInteractorTest {
         every { state.session } returns null
         every { state.searchEngineSource } returns searchEngine
 
+        every {
+            context.getSharedPreferences(
+                PREF_FILE_SEARCH_ENGINES,
+                Context.MODE_PRIVATE
+            )
+        } returns mockk(relaxed = true)
+
         val searchController: SearchController = DefaultSearchController(
             context,
             store,