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diff --git a/test/search-display-controller.test.js b/test/search-display-controller.test.js
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+/*
+ * Copyright (C) 2023-2024  Yomitan Authors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+import {describe, expect, afterAll, test, vi} from 'vitest';
+import {setupDomTest} from './fixtures/dom-test.js';
+import {querySelectorNotNull} from '../ext/js/dom/query-selector.js';
+import {SearchDisplayController} from '../ext/js/display/search-display-controller.js';
+import {Display} from '../ext/js/display/display.js';
+import {DisplayAudio} from '../ext/js/display/display-audio.js';
+import {SearchPersistentStateController} from '../ext/js/display/search-persistent-state-controller.js';
+import {Application} from '../ext/js/application.js';
+import {CrossFrameAPI} from '../ext/js/comm/cross-frame-api.js';
+import {API} from '../ext/js/comm/api.js';
+import {DocumentFocusController} from '../ext/js/dom/document-focus-controller.js';
+import {HotkeyHandler} from '../ext/js/input/hotkey-handler.js';
+import {WebExtension} from '../ext/js/extension/web-extension.js';
+
+const documentSearchDisplayControllerEnv = await setupDomTest('ext/search.html');
+
+const {window, teardown} = documentSearchDisplayControllerEnv;
+
+const {document} = window;
+
+const frameId = 1;
+const tabId = 1;
+const webExtension = new WebExtension();
+const hotkeyHandler = new HotkeyHandler();
+const documentFocusController = new DocumentFocusController();
+const displayPageType = 'search';
+const api = new API(webExtension);
+const crossFrameAPI = new CrossFrameAPI(api, tabId, frameId);
+const application = new Application(api, crossFrameAPI);
+const display = new Display(application, displayPageType, documentFocusController, hotkeyHandler);
+const displayAudio = new DisplayAudio(display);
+const searchPersistentStateController = new SearchPersistentStateController();
+
+const searchDisplayController = new SearchDisplayController(display, displayAudio, searchPersistentStateController);
+
+// eslint-disable-next-line no-underscore-dangle
+const onKeyDownMethod = searchDisplayController._onKeyDown.bind(searchDisplayController);
+
+/**
+ * @type {HTMLInputElement}
+ */
+const queryInput = querySelectorNotNull(document, '#search-textbox');
+
+const focusSpy = vi.spyOn(queryInput, 'focus');
+
+describe('Keyboard Event Handling', () => {
+    afterAll(() => teardown(global));
+
+    const validKeypressEvents = [
+        new KeyboardEvent('keydown', {key: 'a', ctrlKey: false, metaKey: false, altKey: false}),
+        new KeyboardEvent('keydown', {key: 'Backspace'}),
+        new KeyboardEvent('keydown', {key: 'Backspace', ctrlKey: true, metaKey: false, altKey: false})
+    ];
+
+    const invalidKeypressEvents = [
+        new KeyboardEvent('keydown', {key: '', ctrlKey: true, metaKey: false, altKey: false}),
+        new KeyboardEvent('keydown', {key: '', ctrlKey: false, metaKey: true, altKey: false}),
+        new KeyboardEvent('keydown', {key: '', ctrlKey: false, metaKey: false, altKey: true}),
+        new KeyboardEvent('keydown', {key: ' ', ctrlKey: false, metaKey: false, altKey: false}),
+        new KeyboardEvent('keydown', {key: 'a', ctrlKey: true, metaKey: false, altKey: false}),
+        new KeyboardEvent('keydown', {key: 'a', ctrlKey: false, metaKey: true, altKey: false}),
+        new KeyboardEvent('keydown', {key: 'a', ctrlKey: false, metaKey: false, altKey: true}),
+        new KeyboardEvent('keydown', {key: 'Backspace', ctrlKey: false, metaKey: true, altKey: false}),
+        new KeyboardEvent('keydown', {key: 'Backspace', ctrlKey: false, metaKey: false, altKey: true}),
+        new KeyboardEvent('keydown', {key: 'ArrowDown'})
+    ];
+
+    test('should test that onKeyDown function focuses input for valid keys', () => {
+        for (const event of validKeypressEvents) {
+            queryInput.blur();
+            onKeyDownMethod(event);
+        }
+
+        expect(focusSpy.mock.calls.length).toBe(validKeypressEvents.length);
+        focusSpy.mockReset();
+    });
+
+
+    test('should test that onKeyDown function does not focus input for invalid keys', () => {
+        for (const event of invalidKeypressEvents) {
+            queryInput.blur();
+            onKeyDownMethod(event);
+        }
+
+        expect(focusSpy.mock.calls.length).toBe(0);
+    });
+});