diff --git a/session_shells/BUILD.gn b/session_shells/BUILD.gn
index 4c3ff48..0bbc28d 100644
--- a/session_shells/BUILD.gn
+++ b/session_shells/BUILD.gn
@@ -15,7 +15,7 @@
   if (host_os != "mac") {
     _flutter_tester_tests += [
       "ermine/settings:ermine_settings_unittests($host_toolchain)",
-      #"ermine/shell:ermine_unittests($host_toolchain)",
+      "ermine/shell:ermine_unittests($host_toolchain)",
       "ermine/tiler:tiler_unittests($host_toolchain)",
       "ermine/keyboard_shortcuts:keyboard_shortcuts_unittests($host_toolchain)",
     ]
diff --git a/session_shells/ermine/shell/test/app_model_test.dart b/session_shells/ermine/shell/test/app_model_test.dart
index fed816b..e8fc576 100644
--- a/session_shells/ermine/shell/test/app_model_test.dart
+++ b/session_shells/ermine/shell/test/app_model_test.dart
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+import 'dart:ui';
+
 import 'package:keyboard_shortcuts/keyboard_shortcuts.dart'
     show KeyboardShortcuts;
 import 'package:fuchsia_internationalization_flutter/internationalization.dart';
@@ -33,6 +35,8 @@
     statusModel = MockStatusModel();
     clustersModel = MockClustersModel();
 
+    when(localeSource.stream()).thenAnswer((_) => Stream<Locale>.empty());
+
     appModel = _TestAppModel(
       keyboardShortcuts: keyboardShortcuts,
       pointerEventsListener: pointerEventsListener,