Add tests for credentials service

examples/api-tests/src/credentials-service.spec.js

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+// *****************************************************************************
+// Copyright (C) 2024 TypeFox and others.
+//
+// This program and the accompanying materials are made available under the
+// terms of the Eclipse Public License v. 2.0 which is available at
+// http://www.eclipse.org/legal/epl-2.0.
+//
+// This Source Code may also be made available under the following Secondary
+// Licenses when the conditions for such availability set forth in the Eclipse
+// Public License v. 2.0 are satisfied: GNU General Public License, version 2
+// with the GNU Classpath Exception which is available at
+// https://www.gnu.org/software/classpath/license.html.
+//
+// SPDX-License-Identifier: EPL-2.0 OR GPL-2.0-only WITH Classpath-exception-2.0
+// *****************************************************************************
+
+// @ts-check
+describe('CredentialsService', function () {
+    this.timeout(5000);
+    const { assert } = chai;
+
+    const { CredentialsService } = require('@theia/core/lib/browser/credentials-service');
+
+    /** @type {import('inversify').Container} */
+    const container = window['theia'].container;
+    /** @type {import('@theia/core/lib/browser/credentials-service').CredentialsService} */
+    const credentials = container.get(CredentialsService);
+
+    const serviceName = 'theia-test';
+    const accountName = 'test-account';
+    const password = 'test-password';
+
+    this.beforeEach(async () => {
+        await credentials.deletePassword(serviceName, accountName);
+    });
+
+    it('can set and retrieve stored credentials', async function () {
+        await credentials.setPassword(serviceName, accountName, password);
+        const storedPassword = await credentials.getPassword(serviceName, accountName);
+        assert.strictEqual(storedPassword, password);
+    });
+
+});