diff --git a/packages/cli/src/ui/components/ResumeSessionPicker.test.tsx b/packages/cli/src/ui/components/ResumeSessionPicker.test.tsx
new file mode 100644
index 00000000..bd63c3ef
--- /dev/null
+++ b/packages/cli/src/ui/components/ResumeSessionPicker.test.tsx
@@ -0,0 +1,587 @@
+/**
+ * @license
+ * Copyright 2025 Qwen Code
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { render } from 'ink-testing-library';
+import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
+import { SessionPicker } from './ResumeSessionPicker.js';
+import type {
+  SessionListItem,
+  ListSessionsResult,
+} from '@qwen-code/qwen-code-core';
+
+// Mock terminal size
+const mockTerminalSize = { columns: 80, rows: 24 };
+
+beforeEach(() => {
+  Object.defineProperty(process.stdout, 'columns', {
+    value: mockTerminalSize.columns,
+    configurable: true,
+  });
+  Object.defineProperty(process.stdout, 'rows', {
+    value: mockTerminalSize.rows,
+    configurable: true,
+  });
+});
+
+// Helper to create mock sessions
+function createMockSession(
+  overrides: Partial<SessionListItem> = {},
+): SessionListItem {
+  return {
+    sessionId: 'test-session-id',
+    cwd: '/test/path',
+    startTime: '2025-01-01T00:00:00.000Z',
+    mtime: Date.now(),
+    prompt: 'Test prompt',
+    gitBranch: 'main',
+    filePath: '/test/path/sessions/test-session-id.jsonl',
+    messageCount: 5,
+    ...overrides,
+  };
+}
+
+// Helper to create mock session service
+function createMockSessionService(
+  sessions: SessionListItem[] = [],
+  hasMore = false,
+) {
+  return {
+    listSessions: vi.fn().mockResolvedValue({
+      items: sessions,
+      hasMore,
+      nextCursor: hasMore ? Date.now() : undefined,
+    } as ListSessionsResult),
+    loadSession: vi.fn(),
+    loadLastSession: vi
+      .fn()
+      .mockResolvedValue(sessions.length > 0 ? {} : undefined),
+  };
+}
+
+describe('SessionPicker', () => {
+  const wait = (ms = 50) => new Promise((resolve) => setTimeout(resolve, ms));
+
+  afterEach(() => {
+    vi.clearAllMocks();
+  });
+
+  describe('Empty Sessions Filtering', () => {
+    it('should filter out sessions with 0 messages', async () => {
+      const sessions = [
+        createMockSession({
+          sessionId: 'empty-1',
+          messageCount: 0,
+          prompt: '',
+        }),
+        createMockSession({
+          sessionId: 'with-messages',
+          messageCount: 5,
+          prompt: 'Hello',
+        }),
+        createMockSession({
+          sessionId: 'empty-2',
+          messageCount: 0,
+          prompt: '(empty prompt)',
+        }),
+      ];
+      const mockService = createMockSessionService(sessions);
+      const onSelect = vi.fn();
+      const onCancel = vi.fn();
+
+      const { lastFrame } = render(
+        <SessionPicker
+          sessionService={mockService as never}
+          onSelect={onSelect}
+          onCancel={onCancel}
+        />,
+      );
+
+      await wait(100);
+
+      const output = lastFrame();
+      // Should show the session with messages
+      expect(output).toContain('Hello');
+      // Should NOT show empty sessions
+      expect(output).not.toContain('empty-1');
+      expect(output).not.toContain('empty-2');
+    });
+
+    it('should show "No sessions found" when all sessions are empty', async () => {
+      const sessions = [
+        createMockSession({ sessionId: 'empty-1', messageCount: 0 }),
+        createMockSession({ sessionId: 'empty-2', messageCount: 0 }),
+      ];
+      const mockService = createMockSessionService(sessions);
+      const onSelect = vi.fn();
+      const onCancel = vi.fn();
+
+      const { lastFrame } = render(
+        <SessionPicker
+          sessionService={mockService as never}
+          onSelect={onSelect}
+          onCancel={onCancel}
+        />,
+      );
+
+      await wait(100);
+
+      const output = lastFrame();
+      expect(output).toContain('No sessions found');
+    });
+
+    it('should show sessions with 1 or more messages', async () => {
+      const sessions = [
+        createMockSession({
+          sessionId: 'one-msg',
+          messageCount: 1,
+          prompt: 'Single message',
+        }),
+        createMockSession({
+          sessionId: 'many-msg',
+          messageCount: 10,
+          prompt: 'Many messages',
+        }),
+      ];
+      const mockService = createMockSessionService(sessions);
+      const onSelect = vi.fn();
+      const onCancel = vi.fn();
+
+      const { lastFrame } = render(
+        <SessionPicker
+          sessionService={mockService as never}
+          onSelect={onSelect}
+          onCancel={onCancel}
+        />,
+      );
+
+      await wait(100);
+
+      const output = lastFrame();
+      expect(output).toContain('Single message');
+      expect(output).toContain('Many messages');
+      expect(output).toContain('1 message');
+      expect(output).toContain('10 messages');
+    });
+  });
+
+  describe('Branch Filtering', () => {
+    it('should filter by branch when B is pressed', async () => {
+      const sessions = [
+        createMockSession({
+          sessionId: 's1',
+          gitBranch: 'main',
+          prompt: 'Main branch',
+          messageCount: 1,
+        }),
+        createMockSession({
+          sessionId: 's2',
+          gitBranch: 'feature',
+          prompt: 'Feature branch',
+          messageCount: 1,
+        }),
+        createMockSession({
+          sessionId: 's3',
+          gitBranch: 'main',
+          prompt: 'Also main',
+          messageCount: 1,
+        }),
+      ];
+      const mockService = createMockSessionService(sessions);
+      const onSelect = vi.fn();
+      const onCancel = vi.fn();
+
+      const { lastFrame, stdin } = render(
+        <SessionPicker
+          sessionService={mockService as never}
+          currentBranch="main"
+          onSelect={onSelect}
+          onCancel={onCancel}
+        />,
+      );
+
+      await wait(100);
+
+      // All sessions should be visible initially
+      let output = lastFrame();
+      expect(output).toContain('Main branch');
+      expect(output).toContain('Feature branch');
+
+      // Press B to filter by branch
+      stdin.write('B');
+      await wait(50);
+
+      output = lastFrame();
+      // Only main branch sessions should be visible
+      expect(output).toContain('Main branch');
+      expect(output).toContain('Also main');
+      expect(output).not.toContain('Feature branch');
+    });
+
+    it('should combine empty session filter with branch filter', async () => {
+      const sessions = [
+        createMockSession({
+          sessionId: 's1',
+          gitBranch: 'main',
+          messageCount: 0,
+          prompt: 'Empty main',
+        }),
+        createMockSession({
+          sessionId: 's2',
+          gitBranch: 'main',
+          messageCount: 5,
+          prompt: 'Valid main',
+        }),
+        createMockSession({
+          sessionId: 's3',
+          gitBranch: 'feature',
+          messageCount: 5,
+          prompt: 'Valid feature',
+        }),
+      ];
+      const mockService = createMockSessionService(sessions);
+      const onSelect = vi.fn();
+      const onCancel = vi.fn();
+
+      const { lastFrame, stdin } = render(
+        <SessionPicker
+          sessionService={mockService as never}
+          currentBranch="main"
+          onSelect={onSelect}
+          onCancel={onCancel}
+        />,
+      );
+
+      await wait(100);
+
+      // Press B to filter by branch
+      stdin.write('B');
+      await wait(50);
+
+      const output = lastFrame();
+      // Should only show non-empty sessions from main branch
+      expect(output).toContain('Valid main');
+      expect(output).not.toContain('Empty main');
+      expect(output).not.toContain('Valid feature');
+    });
+  });
+
+  describe('Keyboard Navigation', () => {
+    it('should navigate with arrow keys', async () => {
+      const sessions = [
+        createMockSession({
+          sessionId: 's1',
+          prompt: 'First session',
+          messageCount: 1,
+        }),
+        createMockSession({
+          sessionId: 's2',
+          prompt: 'Second session',
+          messageCount: 1,
+        }),
+        createMockSession({
+          sessionId: 's3',
+          prompt: 'Third session',
+          messageCount: 1,
+        }),
+      ];
+      const mockService = createMockSessionService(sessions);
+      const onSelect = vi.fn();
+      const onCancel = vi.fn();
+
+      const { lastFrame, stdin } = render(
+        <SessionPicker
+          sessionService={mockService as never}
+          onSelect={onSelect}
+          onCancel={onCancel}
+        />,
+      );
+
+      await wait(100);
+
+      // First session should be selected initially (indicated by >)
+      let output = lastFrame();
+      expect(output).toContain('First session');
+
+      // Navigate down
+      stdin.write('\u001B[B'); // Down arrow
+      await wait(50);
+
+      output = lastFrame();
+      // Selection indicator should move
+      expect(output).toBeDefined();
+    });
+
+    it('should navigate with vim keys (j/k)', async () => {
+      const sessions = [
+        createMockSession({
+          sessionId: 's1',
+          prompt: 'First',
+          messageCount: 1,
+        }),
+        createMockSession({
+          sessionId: 's2',
+          prompt: 'Second',
+          messageCount: 1,
+        }),
+      ];
+      const mockService = createMockSessionService(sessions);
+      const onSelect = vi.fn();
+      const onCancel = vi.fn();
+
+      const { stdin, unmount } = render(
+        <SessionPicker
+          sessionService={mockService as never}
+          onSelect={onSelect}
+          onCancel={onCancel}
+        />,
+      );
+
+      await wait(100);
+
+      // Navigate with j (down)
+      stdin.write('j');
+      await wait(50);
+
+      // Navigate with k (up)
+      stdin.write('k');
+      await wait(50);
+
+      unmount();
+    });
+
+    it('should select session on Enter', async () => {
+      const sessions = [
+        createMockSession({
+          sessionId: 'selected-session',
+          prompt: 'Select me',
+          messageCount: 1,
+        }),
+      ];
+      const mockService = createMockSessionService(sessions);
+      const onSelect = vi.fn();
+      const onCancel = vi.fn();
+
+      const { stdin } = render(
+        <SessionPicker
+          sessionService={mockService as never}
+          onSelect={onSelect}
+          onCancel={onCancel}
+        />,
+      );
+
+      await wait(100);
+
+      // Press Enter to select
+      stdin.write('\r');
+      await wait(50);
+
+      expect(onSelect).toHaveBeenCalledWith('selected-session');
+    });
+
+    it('should cancel on Escape', async () => {
+      const sessions = [
+        createMockSession({ sessionId: 's1', messageCount: 1 }),
+      ];
+      const mockService = createMockSessionService(sessions);
+      const onSelect = vi.fn();
+      const onCancel = vi.fn();
+
+      const { stdin } = render(
+        <SessionPicker
+          sessionService={mockService as never}
+          onSelect={onSelect}
+          onCancel={onCancel}
+        />,
+      );
+
+      await wait(100);
+
+      // Press Escape to cancel
+      stdin.write('\u001B');
+      await wait(50);
+
+      expect(onCancel).toHaveBeenCalled();
+      expect(onSelect).not.toHaveBeenCalled();
+    });
+  });
+
+  describe('Display', () => {
+    it('should show session metadata', async () => {
+      const sessions = [
+        createMockSession({
+          sessionId: 's1',
+          prompt: 'Test prompt text',
+          messageCount: 5,
+          gitBranch: 'feature-branch',
+        }),
+      ];
+      const mockService = createMockSessionService(sessions);
+      const onSelect = vi.fn();
+      const onCancel = vi.fn();
+
+      const { lastFrame } = render(
+        <SessionPicker
+          sessionService={mockService as never}
+          onSelect={onSelect}
+          onCancel={onCancel}
+        />,
+      );
+
+      await wait(100);
+
+      const output = lastFrame();
+      expect(output).toContain('Test prompt text');
+      expect(output).toContain('5 messages');
+      expect(output).toContain('feature-branch');
+    });
+
+    it('should show header and footer', async () => {
+      const sessions = [createMockSession({ messageCount: 1 })];
+      const mockService = createMockSessionService(sessions);
+      const onSelect = vi.fn();
+      const onCancel = vi.fn();
+
+      const { lastFrame } = render(
+        <SessionPicker
+          sessionService={mockService as never}
+          onSelect={onSelect}
+          onCancel={onCancel}
+        />,
+      );
+
+      await wait(100);
+
+      const output = lastFrame();
+      expect(output).toContain('Resume Session');
+      expect(output).toContain('to navigate');
+      expect(output).toContain('Esc to cancel');
+    });
+
+    it('should show branch toggle hint when currentBranch is provided', async () => {
+      const sessions = [createMockSession({ messageCount: 1 })];
+      const mockService = createMockSessionService(sessions);
+      const onSelect = vi.fn();
+      const onCancel = vi.fn();
+
+      const { lastFrame } = render(
+        <SessionPicker
+          sessionService={mockService as never}
+          currentBranch="main"
+          onSelect={onSelect}
+          onCancel={onCancel}
+        />,
+      );
+
+      await wait(100);
+
+      const output = lastFrame();
+      expect(output).toContain('B');
+      expect(output).toContain('toggle branch');
+    });
+
+    it('should truncate long prompts', async () => {
+      const longPrompt = 'A'.repeat(300);
+      const sessions = [
+        createMockSession({ prompt: longPrompt, messageCount: 1 }),
+      ];
+      const mockService = createMockSessionService(sessions);
+      const onSelect = vi.fn();
+      const onCancel = vi.fn();
+
+      const { lastFrame } = render(
+        <SessionPicker
+          sessionService={mockService as never}
+          onSelect={onSelect}
+          onCancel={onCancel}
+        />,
+      );
+
+      await wait(100);
+
+      const output = lastFrame();
+      // Should contain ellipsis for truncated text
+      expect(output).toContain('...');
+      // Should NOT contain the full untruncated prompt (300 A's in a row)
+      expect(output).not.toContain(longPrompt);
+    });
+
+    it('should show "(empty prompt)" for sessions without prompt text', async () => {
+      const sessions = [createMockSession({ prompt: '', messageCount: 1 })];
+      const mockService = createMockSessionService(sessions);
+      const onSelect = vi.fn();
+      const onCancel = vi.fn();
+
+      const { lastFrame } = render(
+        <SessionPicker
+          sessionService={mockService as never}
+          onSelect={onSelect}
+          onCancel={onCancel}
+        />,
+      );
+
+      await wait(100);
+
+      const output = lastFrame();
+      expect(output).toContain('(empty prompt)');
+    });
+  });
+
+  describe('Pagination', () => {
+    it('should load more sessions when scrolling to bottom', async () => {
+      const firstPage = Array.from({ length: 5 }, (_, i) =>
+        createMockSession({
+          sessionId: `session-${i}`,
+          prompt: `Session ${i}`,
+          messageCount: 1,
+          mtime: Date.now() - i * 1000,
+        }),
+      );
+      const secondPage = Array.from({ length: 3 }, (_, i) =>
+        createMockSession({
+          sessionId: `session-${i + 5}`,
+          prompt: `Session ${i + 5}`,
+          messageCount: 1,
+          mtime: Date.now() - (i + 5) * 1000,
+        }),
+      );
+
+      const mockService = {
+        listSessions: vi
+          .fn()
+          .mockResolvedValueOnce({
+            items: firstPage,
+            hasMore: true,
+            nextCursor: Date.now() - 5000,
+          })
+          .mockResolvedValueOnce({
+            items: secondPage,
+            hasMore: false,
+            nextCursor: undefined,
+          }),
+        loadSession: vi.fn(),
+        loadLastSession: vi.fn().mockResolvedValue({}),
+      };
+
+      const onSelect = vi.fn();
+      const onCancel = vi.fn();
+
+      const { unmount } = render(
+        <SessionPicker
+          sessionService={mockService as never}
+          onSelect={onSelect}
+          onCancel={onCancel}
+        />,
+      );
+
+      await wait(200);
+
+      // First page should be loaded
+      expect(mockService.listSessions).toHaveBeenCalled();
+
+      unmount();
+    });
+  });
+});
diff --git a/packages/cli/src/ui/components/ResumeSessionPicker.tsx b/packages/cli/src/ui/components/ResumeSessionPicker.tsx
index c520d5b9..45acc915 100644
--- a/packages/cli/src/ui/components/ResumeSessionPicker.tsx
+++ b/packages/cli/src/ui/components/ResumeSessionPicker.tsx
@@ -17,7 +17,8 @@ import { formatRelativeTime } from '../utils/formatters.js';
 
 const PAGE_SIZE = 20;
 
-interface SessionPickerProps {
+// Exported for testing
+export interface SessionPickerProps {
   sessionService: SessionService;
   currentBranch?: string;
   onSelect: (sessionId: string) => void;
@@ -33,7 +34,8 @@ function truncateText(text: string, maxWidth: number): string {
   return text.slice(0, maxWidth - 3) + '...';
 }
 
-function SessionPicker({
+// Exported for testing
+export function SessionPicker({
   sessionService,
   currentBranch,
   onSelect,