extract conversation navigation state

frontend/src/test/useConversationNavigation.test.ts

@@ -0,0 +1,82 @@
+import { act, renderHook } from '@testing-library/react';
+import { describe, expect, it, vi } from 'vitest';
+
+import { useConversationNavigation } from '../hooks/useConversationNavigation';
+import type { Channel } from '../types';
+
+const publicChannel: Channel = {
+  key: '8B3387E9C5CDEA6AC9E5EDBAA115CD72',
+  name: 'Public',
+  is_hashtag: false,
+  on_radio: false,
+  last_read_at: null,
+};
+
+function createArgs(overrides: Partial<Parameters<typeof useConversationNavigation>[0]> = {}) {
+  return {
+    channels: [publicChannel],
+    handleSelectConversation: vi.fn(),
+    ...overrides,
+  };
+}
+
+describe('useConversationNavigation', () => {
+  it('resets the jump target when switching to a non-search conversation', () => {
+    const args = createArgs();
+    const { result } = renderHook(() => useConversationNavigation(args));
+
+    act(() => {
+      result.current.setTargetMessageId(10);
+      result.current.handleSelectConversationWithTargetReset({
+        type: 'contact',
+        id: 'aa'.repeat(32),
+        name: 'Alice',
+      });
+    });
+
+    expect(result.current.targetMessageId).toBeNull();
+    expect(args.handleSelectConversation).toHaveBeenCalledWith({
+      type: 'contact',
+      id: 'aa'.repeat(32),
+      name: 'Alice',
+    });
+  });
+
+  it('preserves the jump target when navigating from search results', () => {
+    const args = createArgs();
+    const { result } = renderHook(() => useConversationNavigation(args));
+
+    act(() => {
+      result.current.handleNavigateToMessage({
+        id: 321,
+        type: 'CHAN',
+        conversation_key: publicChannel.key,
+        conversation_name: publicChannel.name,
+      });
+    });
+
+    expect(result.current.targetMessageId).toBe(321);
+    expect(args.handleSelectConversation).toHaveBeenCalledWith({
+      type: 'channel',
+      id: publicChannel.key,
+      name: publicChannel.name,
+    });
+  });
+
+  it('closes the contact info pane when navigating to a channel', () => {
+    const args = createArgs();
+    const { result } = renderHook(() => useConversationNavigation(args));
+
+    act(() => {
+      result.current.handleOpenContactInfo('bb'.repeat(32), true);
+      result.current.handleNavigateToChannel(publicChannel.key);
+    });
+
+    expect(result.current.infoPaneContactKey).toBeNull();
+    expect(args.handleSelectConversation).toHaveBeenCalledWith({
+      type: 'channel',
+      id: publicChannel.key,
+      name: publicChannel.name,
+    });
+  });
+});