diff --git a/frontend/src/components/llm/__tests__/LLMProviders.test.tsx b/frontend/src/components/llm/__tests__/LLMProviders.test.tsx
new file mode 100644
index 0000000..6addb8f
--- /dev/null
+++ b/frontend/src/components/llm/__tests__/LLMProviders.test.tsx
@@ -0,0 +1,20 @@
+import { render, screen } from '@testing-library/react';
+import { describe, expect, it, vi } from 'vitest';
+import { LLMProviders } from '../LLMProviders';
+
+vi.mock('../ProviderList', () => ({
+  ProviderList: () => <div>提供商区域</div>,
+}));
+
+vi.mock('../RoleAssignment', () => ({
+  RoleAssignment: () => <div>角色区域</div>,
+}));
+
+describe('LLMProviders', () => {
+  it('renders providers and roles sections', () => {
+    render(<LLMProviders />);
+
+    expect(screen.getByText('提供商区域')).toBeInTheDocument();
+    expect(screen.getByText('角色区域')).toBeInTheDocument();
+  });
+});
diff --git a/frontend/src/components/llm/__tests__/ModelCombobox.test.tsx b/frontend/src/components/llm/__tests__/ModelCombobox.test.tsx
new file mode 100644
index 0000000..25ab733
--- /dev/null
+++ b/frontend/src/components/llm/__tests__/ModelCombobox.test.tsx
@@ -0,0 +1,71 @@
+import { QueryClient, QueryClientProvider } from '@tanstack/react-query';
+import { render, screen, waitFor } from '@testing-library/react';
+import userEvent from '@testing-library/user-event';
+import type { ReactNode } from 'react';
+import { describe, expect, it, vi } from 'vitest';
+import { ModelCombobox } from '../ModelCombobox';
+import { fetchModels } from '@/services/llmProviderService';
+
+vi.mock('@/services/llmProviderService', async () => {
+  const actual = await vi.importActual<typeof import('@/services/llmProviderService')>('@/services/llmProviderService');
+  return {
+    ...actual,
+    fetchModels: vi.fn(),
+  };
+});
+
+function renderWithQuery(ui: ReactNode) {
+  const queryClient = new QueryClient({
+    defaultOptions: {
+      queries: { retry: false },
+    },
+  });
+  return render(<QueryClientProvider client={queryClient}>{ui}</QueryClientProvider>);
+}
+
+describe('ModelCombobox', () => {
+  it('shows API tag and selects API model', async () => {
+    vi.mocked(fetchModels).mockResolvedValueOnce(['api-model-1']);
+    const user = userEvent.setup();
+    const onChange = vi.fn();
+
+    renderWithQuery(
+      <ModelCombobox providerId="p1" providerType="openai_compatible" value="" onChange={onChange} />,
+    );
+
+    const input = screen.getByPlaceholderText('选择或输入模型...');
+    await user.click(input);
+
+    expect(await screen.findByText('api-model-1')).toBeInTheDocument();
+    expect(screen.getByText('API')).toBeInTheDocument();
+
+    await user.click(screen.getByText('api-model-1'));
+    expect(onChange).toHaveBeenCalledWith('api-model-1');
+  });
+
+  it('shows 推荐 and 自定义 tags and supports custom input', async () => {
+    vi.mocked(fetchModels).mockResolvedValueOnce([]);
+    const user = userEvent.setup();
+    const onChange = vi.fn();
+
+    renderWithQuery(
+      <ModelCombobox providerId="p2" providerType="openai_compatible" value="" onChange={onChange} />,
+    );
+
+    const input = screen.getByPlaceholderText('选择或输入模型...');
+    await user.click(input);
+
+    expect((await screen.findAllByText('推荐')).length).toBeGreaterThan(0);
+    expect(screen.getByText('gpt-4o')).toBeInTheDocument();
+
+    await user.clear(input);
+    await user.type(input, 'my-custom-model');
+
+    expect(await screen.findByText('自定义')).toBeInTheDocument();
+    await user.click(screen.getByText('my-custom-model'));
+
+    await waitFor(() => {
+      expect(onChange).toHaveBeenCalledWith('my-custom-model');
+    });
+  });
+});
diff --git a/frontend/src/components/llm/__tests__/ProviderList.test.tsx b/frontend/src/components/llm/__tests__/ProviderList.test.tsx
new file mode 100644
index 0000000..34bf799
--- /dev/null
+++ b/frontend/src/components/llm/__tests__/ProviderList.test.tsx
@@ -0,0 +1,90 @@
+import { QueryClient, QueryClientProvider } from '@tanstack/react-query';
+import { render, screen } from '@testing-library/react';
+import type { ReactNode } from 'react';
+import { describe, expect, it, vi } from 'vitest';
+import { ProviderList } from '../ProviderList';
+import {
+  fetchProviders,
+  fetchRoles,
+  updateProvider,
+  deleteProvider,
+  testProvider,
+} from '@/services/llmProviderService';
+
+vi.mock('sonner', () => ({
+  toast: {
+    success: vi.fn(),
+    error: vi.fn(),
+  },
+}));
+
+vi.mock('@/services/llmProviderService', () => ({
+  fetchProviders: vi.fn(),
+  fetchRoles: vi.fn(),
+  updateProvider: vi.fn(),
+  deleteProvider: vi.fn(),
+  testProvider: vi.fn(),
+}));
+
+function renderWithQuery(ui: ReactNode) {
+  const queryClient = new QueryClient({
+    defaultOptions: {
+      queries: { retry: false },
+      mutations: { retry: false },
+    },
+  });
+  return render(<QueryClientProvider client={queryClient}>{ui}</QueryClientProvider>);
+}
+
+describe('ProviderList', () => {
+  it('renders providers, enable states and hasKey indicators', async () => {
+    vi.mocked(fetchProviders).mockResolvedValueOnce([
+      {
+        id: 'p1',
+        name: 'OpenAI 官方',
+        type: 'openai_responses',
+        baseUrl: null,
+        defaultModel: 'gpt-4o',
+        isEnabled: true,
+        hasKey: true,
+        extraConfig: {},
+        createdAt: '2026-01-01',
+      },
+      {
+        id: 'p2',
+        name: '本地兼容服务',
+        type: 'openai_compatible',
+        baseUrl: 'https://example.com/v1',
+        defaultModel: 'qwen-plus',
+        isEnabled: false,
+        hasKey: false,
+        extraConfig: {},
+        createdAt: '2026-01-01',
+      },
+    ]);
+    vi.mocked(fetchRoles).mockResolvedValueOnce([]);
+    vi.mocked(updateProvider).mockResolvedValue({} as never);
+    vi.mocked(deleteProvider).mockResolvedValue(undefined);
+    vi.mocked(testProvider).mockResolvedValue({ success: true });
+
+    renderWithQuery(<ProviderList />);
+
+    expect(await screen.findByText('模型提供商')).toBeInTheDocument();
+    expect(await screen.findByText('OpenAI 官方')).toBeInTheDocument();
+    expect(await screen.findByText('本地兼容服务')).toBeInTheDocument();
+    expect(screen.getByText('OpenAI Responses')).toBeInTheDocument();
+    expect(screen.getByText('OpenAI 兼容')).toBeInTheDocument();
+    expect(screen.getByText('就绪')).toBeInTheDocument();
+    expect(screen.getByText('无 Key')).toBeInTheDocument();
+
+    const switches = screen.getAllByRole('switch');
+    expect(switches).toHaveLength(2);
+    expect(switches[0]).toHaveAttribute('data-state', 'checked');
+    expect(switches[1]).toHaveAttribute('data-state', 'unchecked');
+
+    const testButtons = screen.getAllByTitle('测试连接');
+    expect(testButtons).toHaveLength(2);
+    expect(testButtons[0]).toBeEnabled();
+    expect(testButtons[1]).toBeDisabled();
+  });
+});
diff --git a/frontend/src/components/llm/__tests__/RoleAssignment.test.tsx b/frontend/src/components/llm/__tests__/RoleAssignment.test.tsx
new file mode 100644
index 0000000..1ece5f3
--- /dev/null
+++ b/frontend/src/components/llm/__tests__/RoleAssignment.test.tsx
@@ -0,0 +1,94 @@
+import { QueryClient, QueryClientProvider } from '@tanstack/react-query';
+import { render, screen, waitFor } from '@testing-library/react';
+import userEvent from '@testing-library/user-event';
+import type { ReactNode } from 'react';
+import { describe, expect, it, vi } from 'vitest';
+import { RoleAssignment } from '../RoleAssignment';
+import { fetchProviders, fetchRoles, setRole } from '@/services/llmProviderService';
+
+vi.mock('sonner', () => ({
+  toast: {
+    success: vi.fn(),
+    error: vi.fn(),
+  },
+}));
+
+vi.mock('@/services/llmProviderService', async () => {
+  const actual = await vi.importActual<typeof import('@/services/llmProviderService')>('@/services/llmProviderService');
+  return {
+    ...actual,
+    fetchProviders: vi.fn(),
+    fetchRoles: vi.fn(),
+    setRole: vi.fn(),
+    fetchModels: vi.fn().mockResolvedValue([]),
+  };
+});
+
+function renderWithQuery(ui: ReactNode) {
+  const queryClient = new QueryClient({
+    defaultOptions: {
+      queries: { retry: false },
+      mutations: { retry: false },
+    },
+  });
+  return render(<QueryClientProvider client={queryClient}>{ui}</QueryClientProvider>);
+}
+
+describe('RoleAssignment', () => {
+  it('renders role cards and supports provider/model editing', async () => {
+    vi.mocked(fetchProviders).mockResolvedValueOnce([
+      {
+        id: 'p1',
+        name: 'OpenAI',
+        type: 'openai_responses',
+        baseUrl: null,
+        defaultModel: 'gpt-4o-mini',
+        isEnabled: true,
+        hasKey: true,
+        extraConfig: {},
+        createdAt: '2026-01-01',
+      },
+    ]);
+
+    vi.mocked(fetchRoles).mockResolvedValueOnce([
+      {
+        role: 'legacy',
+        providerId: 'p1',
+        providerName: 'OpenAI',
+        providerType: 'openai_responses',
+        model: 'gpt-4o',
+      },
+    ]);
+
+    vi.mocked(setRole).mockResolvedValue({
+      role: 'planner',
+      providerId: 'p1',
+      providerName: 'OpenAI',
+      providerType: 'openai_responses',
+      model: 'custom-planner-model',
+    });
+
+    const user = userEvent.setup();
+    renderWithQuery(<RoleAssignment />);
+
+    expect(await screen.findByText('角色分配')).toBeInTheDocument();
+    expect(await screen.findByText('Legacy 审查')).toBeInTheDocument();
+    expect(await screen.findByText('规划器 Planner')).toBeInTheDocument();
+
+    // Radix Select renders placeholder in a span with pointer-events: none.
+    // Click the trigger button (parent) instead of the placeholder text.
+    const providerPlaceholders = screen.getAllByText('选择提供商');
+    const triggerButton = providerPlaceholders[0].closest('button')!;
+    await user.click(triggerButton);
+    await user.click(await screen.findByRole('option', { name: /OpenAI/ }));
+
+    const modelInputs = screen.getAllByPlaceholderText('选择或输入模型...') as HTMLInputElement[];
+    await waitFor(() => {
+      expect(modelInputs[1].value).toBe('gpt-4o-mini');
+    });
+
+    await user.clear(modelInputs[1]);
+    await user.type(modelInputs[1], 'custom-planner-model');
+    expect(modelInputs[1].value).toBe('custom-planner-model');
+  });
+});
diff --git a/frontend/src/components/llm/__tests__/TestResultDialog.test.tsx b/frontend/src/components/llm/__tests__/TestResultDialog.test.tsx
new file mode 100644
index 0000000..8f3a901
--- /dev/null
+++ b/frontend/src/components/llm/__tests__/TestResultDialog.test.tsx
@@ -0,0 +1,58 @@
+import { render, screen } from '@testing-library/react';
+import userEvent from '@testing-library/user-event';
+import { describe, expect, it, vi } from 'vitest';
+import { TestResultDialog } from '../TestResultDialog';
+
+describe('TestResultDialog', () => {
+  it('renders success state with latency, model and message', () => {
+    render(
+      <TestResultDialog
+        open
+        onOpenChange={vi.fn()}
+        providerName="DeepSeek"
+        result={{
+          success: true,
+          latencyMs: 123,
+          model: 'deepseek-chat',
+          message: '连接已建立',
+        }}
+      />,
+    );
+
+    expect(screen.getByText('测试结果 - DeepSeek')).toBeInTheDocument();
+    expect(screen.getByText('连接成功')).toBeInTheDocument();
+    expect(screen.getByText('延迟:')).toBeInTheDocument();
+    expect(screen.getByText('123 ms')).toBeInTheDocument();
+    expect(screen.getByText('模型:')).toBeInTheDocument();
+    expect(screen.getByText('deepseek-chat')).toBeInTheDocument();
+    expect(screen.getByText('AI 响应:')).toBeInTheDocument();
+    expect(screen.getByText('连接已建立')).toBeInTheDocument();
+  });
+
+  it('renders error state and closes via button', async () => {
+    const onOpenChange = vi.fn();
+    const user = userEvent.setup();
+
+    render(
+      <TestResultDialog
+        open
+        onOpenChange={onOpenChange}
+        providerName="OpenAI"
+        result={{
+          success: false,
+          latencyMs: 789,
+          error: '认证失败',
+        }}
+      />,
+    );
+
+    expect(screen.getByText('测试失败')).toBeInTheDocument();
+    expect(screen.getByText('延迟:')).toBeInTheDocument();
+    expect(screen.getByText('789 ms')).toBeInTheDocument();
+    expect(screen.getByText('错误:')).toBeInTheDocument();
+    expect(screen.getByText('认证失败')).toBeInTheDocument();
+
+    await user.click(screen.getByRole('button', { name: '关闭' }));
+    expect(onOpenChange).toHaveBeenCalledWith(false);
+  });
+});