diff --git a/web/src/pages/settings/__tests__/DataSourceTab.test.tsx b/web/src/pages/settings/__tests__/DataSourceTab.test.tsx
new file mode 100644
index 00000000..83af6d92
--- /dev/null
+++ b/web/src/pages/settings/__tests__/DataSourceTab.test.tsx
@@ -0,0 +1,102 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { beforeAll, beforeEach, describe, expect, it, vi } from 'vitest';
+import { render, screen, waitFor } from '@testing-library/react';
+import userEvent from '@testing-library/user-event';
+import { App } from 'antd';
+import type { DataSource } from '../../../api/settings';
+import { listDataSources, testDataSource } from '../../../api/settings';
+import { DataSourceTab } from '../index';
+
+vi.mock('../../../api/settings', () => ({
+  createDataSource: vi.fn(),
+  deleteDataSource: vi.fn(),
+  getGeneralSettings: vi.fn(),
+  listDataSources: vi.fn(),
+  saveGeneralSettings: vi.fn(),
+  testDataSource: vi.fn(),
+  updateDataSource: vi.fn(),
+}));
+
+const sources: DataSource[] = [
+  {
+    key: 'prom-prod',
+    name: 'Prometheus prod',
+    type: 'Prometheus',
+    url: 'http://prometheus:9090',
+    auth: 'None',
+    status: 'healthy',
+  },
+  {
+    key: 'thanos-dr',
+    name: 'Thanos DR',
+    type: 'Thanos',
+    url: 'http://thanos:10902',
+    auth: 'Bearer Token',
+    status: 'healthy',
+  },
+];
+
+beforeAll(() => {
+  Object.defineProperty(window, 'matchMedia', {
+    writable: true,
+    value: vi.fn().mockImplementation((query: string) => ({
+      matches: false,
+      media: query,
+      onchange: null,
+      addListener: vi.fn(),
+      removeListener: vi.fn(),
+      addEventListener: vi.fn(),
+      removeEventListener: vi.fn(),
+      dispatchEvent: vi.fn(),
+    })),
+  });
+});
+
+describe('DataSourceTab', () => {
+  beforeEach(() => {
+    vi.mocked(listDataSources).mockResolvedValue(sources);
+  });
+
+  it('shows connection test loading only on the clicked row', async () => {
+    let resolveTest: (value: { success: boolean; message: string }) => void = () => undefined;
+    vi.mocked(testDataSource).mockReturnValue(
+      new Promise((resolve) => {
+        resolveTest = resolve;
+      }),
+    );
+
+    const user = userEvent.setup();
+    render(
+      <App>
+        <DataSourceTab />
+      </App>,
+    );
+
+    await screen.findByText('Prometheus prod');
+    const buttons = screen.getAllByRole('button', { name: /测试连接/ });
+    await user.click(buttons[0]);
+
+    await waitFor(() => {
+      expect(buttons[0]).toHaveClass('ant-btn-loading');
+      expect(buttons[1]).not.toHaveClass('ant-btn-loading');
+    });
+
+    resolveTest({ success: true, message: 'ok' });
+  });
+});
diff --git a/web/src/pages/settings/index.tsx b/web/src/pages/settings/index.tsx
index 9344eea0..434a03b4 100644
--- a/web/src/pages/settings/index.tsx
+++ b/web/src/pages/settings/index.tsx
@@ -237,13 +237,13 @@ const GeneralSettingsTab = () => {
 
 // ─── Data Source Tab ────────────────────────────────────────────────────────
 
-const DataSourceTab = () => {
+export const DataSourceTab = () => {
   const [dataSources, setDataSources] = useState<DataSource[]>([]);
   const [loading, setLoading] = useState(true);
   const [modalOpen, setModalOpen] = useState(false);
   const [editingDataSource, setEditingDataSource] = useState<DataSource | null>(null);
   const [dsForm] = Form.useForm();
-  const [testing, setTesting] = useState(false);
+  const [testingKey, setTestingKey] = useState<string | null>(null);
   const [submitting, setSubmitting] = useState(false);
 
   useEffect(() => {
@@ -264,8 +264,11 @@ const DataSourceTab = () => {
     };
   }, []);
 
-  const handleTestConnection = async (data: Pick<DataSource, 'type' | 'url' | 'auth'>) => {
-    setTesting(true);
+  const handleTestConnection = async (
+    data: Pick<DataSource, 'type' | 'url' | 'auth'>,
+    key: string,
+  ) => {
+    setTestingKey(key);
     try {
       const result = await testDataSource(data);
       if (result.success) message.success(result.message);
@@ -273,7 +276,7 @@ const DataSourceTab = () => {
     } catch {
       message.error('连接测试失败，请稍后重试');
     } finally {
-      setTesting(false);
+      setTestingKey(null);
     }
   };
 
@@ -347,8 +350,8 @@ const DataSourceTab = () => {
             type="link"
             size="small"
             icon={<ApiOutlined />}
-            loading={testing}
-            onClick={() => void handleTestConnection(record)}
+            loading={testingKey === record.key}
+            onClick={() => void handleTestConnection(record, record.key)}
           >
             测试连接
           </Button>
@@ -447,11 +450,11 @@ const DataSourceTab = () => {
 
           <Button
             icon={<ApiOutlined />}
-            loading={testing}
+            loading={testingKey === 'modal'}
             onClick={() => {
               void dsForm
                 .validateFields(['type', 'url', 'auth'])
-                .then((values) => handleTestConnection(values))
+                .then((values) => handleTestConnection(values, 'modal'))
                 .catch(() => undefined);
             }}
             style={{ marginTop: 8 }}