diff --git a/src/client/web/src/components/__test__/pane_settings.test.tsx b/src/client/web/src/components/__test__/pane_settings.test.tsx
new file mode 100644
index 0000000..ae3f213
--- /dev/null
+++ b/src/client/web/src/components/__test__/pane_settings.test.tsx
@@ -0,0 +1,59 @@
+import { mock, instance } from "ts-mockito";
+
+import { PaneSettings } from "../pane_settings";
+import { initUploadMgr } from "../../worker/upload_mgr";
+import { ICoreState, newState } from "../core_state";
+import { updater } from "../state_updater";
+import { MockWorker } from "../../worker/interface";
+import {
+  NewMockUsersClient,
+  resps as usersResps,
+} from "../../client/users_mock";
+import {
+  NewMockFilesClient,
+  resps as filesResps,
+} from "../../client/files_mock";
+import { NewMockSettingsClient } from "../../client/settings_mock";
+import { MockWebEnv } from "../../test/helpers";
+import { SetEnv } from "../../common/env";
+
+describe("PaneSettings", () => {
+  const initPaneSettings = (): any => {
+    const mockWorkerClass = mock(MockWorker);
+    const mockWorker = instance(mockWorkerClass);
+    initUploadMgr(mockWorker);
+
+    const coreState = newState();
+    const usersCl = NewMockUsersClient("");
+    const filesCl = NewMockFilesClient("");
+    const settingsCl = NewMockSettingsClient("");
+
+    updater().init(coreState);
+    updater().setClients(usersCl, filesCl, settingsCl);
+
+    const paneSettings = new PaneSettings({
+      msg: coreState.msg,
+      login: coreState.login,
+      update: (updater: (prevState: ICoreState) => ICoreState) => {},
+    });
+
+    return {
+      paneSettings,
+      usersCl,
+      filesCl,
+      settingsCl,
+    };
+  };
+
+  test("Preferences settings alerts", async () => {
+    const { paneSettings, usersCl, filesCl, settingCl } = initPaneSettings();
+    const env = new MockWebEnv();
+    SetEnv(env);
+
+    await paneSettings.setLan("en_US");
+    expect(env.alertMsg.mock.calls.length).toBe(1);
+
+    await paneSettings.setTheme("light");
+    expect(env.alertMsg.mock.calls.length).toBe(2);
+  });
+});