feat(coding): add renderer conversation store

tests/unit/coding-conversations-facade.test.ts

@@ -0,0 +1,82 @@
+import { beforeEach, describe, expect, it, vi } from 'vitest';
+
+const hostApi = vi.hoisted(() => ({
+  fetch: vi.fn(),
+  ensureToken: vi.fn(),
+  createEvents: vi.fn(),
+}));
+
+vi.mock('@/lib/host-api', () => ({
+  hostApiFetch: hostApi.fetch,
+  ensureHostApiToken: hostApi.ensureToken,
+  createHostEventSource: hostApi.createEvents,
+}));
+
+describe('coding Conversations Host facade', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it('loads the target snapshot through the encoded Host route', async () => {
+    const snapshot = { conversation: { id: 'conversation/a' } };
+    hostApi.fetch.mockResolvedValueOnce({ snapshot });
+    const { getCodingConversationSnapshot } = await import('@/lib/coding-conversations');
+
+    await expect(getCodingConversationSnapshot('conversation/a')).resolves.toBe(snapshot);
+    expect(hostApi.fetch).toHaveBeenCalledWith(
+      '/api/coding/conversations/conversation%2Fa/snapshot',
+    );
+  });
+
+  it('submits only the product prompt DTO and returns its acceptance', async () => {
+    const acceptance = {
+      accepted: true,
+      conversationId: 'conversation/a',
+      clientRequestId: 'request-1',
+      runId: 'run-1',
+      mode: 'prompt',
+    };
+    hostApi.fetch.mockResolvedValueOnce({ acceptance });
+    const { submitCodingConversationPrompt } = await import('@/lib/coding-conversations');
+
+    await expect(submitCodingConversationPrompt({
+      conversationId: 'conversation/a',
+      clientRequestId: 'request-1',
+      mode: 'prompt',
+      text: 'Build it',
+      attachments: [{ attachmentId: 'attachment-1' }],
+    })).resolves.toBe(acceptance);
+    expect(hostApi.fetch).toHaveBeenCalledWith(
+      '/api/coding/conversations/conversation%2Fa/prompt',
+      {
+        method: 'POST',
+        body: JSON.stringify({
+          clientRequestId: 'request-1',
+          mode: 'prompt',
+          text: 'Build it',
+          attachments: [{ attachmentId: 'attachment-1' }],
+        }),
+      },
+    );
+  });
+
+  it('hydrates the Host token before constructing the EventSource URL', async () => {
+    const order: string[] = [];
+    const source = { close: vi.fn() } as unknown as EventSource;
+    hostApi.ensureToken.mockImplementationOnce(async () => {
+      order.push('token');
+      return 'host-token';
+    });
+    hostApi.createEvents.mockImplementationOnce((path: string) => {
+      order.push(`events:${path}`);
+      return source;
+    });
+    const { openCodingConversationEvents } = await import('@/lib/coding-conversations');
+
+    await expect(openCodingConversationEvents('conversation/a')).resolves.toBe(source);
+    expect(order).toEqual([
+      'token',
+      'events:/api/coding/events?conversationId=conversation%2Fa',
+    ]);
+  });
+});