From c8ecd640220331ce7695d72ea8c618dd8909eab1 Mon Sep 17 00:00:00 2001
From: Kit Langton <kit.langton@gmail.com>
Date: Tue, 31 Mar 2026 21:24:39 -0400
Subject: test(app): add mock llm e2e fixture (#20375)

---
 packages/app/e2e/fixtures.ts | 67 +++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 63 insertions(+), 4 deletions(-)

(limited to 'packages/app/e2e/fixtures.ts')

diff --git a/packages/app/e2e/fixtures.ts b/packages/app/e2e/fixtures.ts
index ca06858a4..7fc4cda05 100644
--- a/packages/app/e2e/fixtures.ts
+++ b/packages/app/e2e/fixtures.ts
@@ -1,5 +1,8 @@
 import { test as base, expect, type Page } from "@playwright/test"
+import { ManagedRuntime } from "effect"
 import type { E2EWindow } from "../src/testing/terminal"
+import type { Item, Reply, Usage } from "../../opencode/test/lib/llm-server"
+import { TestLLMServer } from "../../opencode/test/lib/llm-server"
 import {
   healthPhase,
   cleanupSession,
@@ -13,6 +16,24 @@ import {
 } from "./actions"
 import { createSdk, dirSlug, getWorktree, sessionPath } from "./utils"
 
+type LLMFixture = {
+  url: string
+  push: (...input: (Item | Reply)[]) => Promise<void>
+  text: (value: string, opts?: { usage?: Usage }) => Promise<void>
+  tool: (name: string, input: unknown) => Promise<void>
+  toolHang: (name: string, input: unknown) => Promise<void>
+  reason: (value: string, opts?: { text?: string; usage?: Usage }) => Promise<void>
+  fail: (message?: unknown) => Promise<void>
+  error: (status: number, body: unknown) => Promise<void>
+  hang: () => Promise<void>
+  hold: (value: string, wait: PromiseLike<unknown>) => Promise<void>
+  hits: () => Promise<Array<{ url: URL; body: Record<string, unknown> }>>
+  calls: () => Promise<number>
+  wait: (count: number) => Promise<void>
+  inputs: () => Promise<Record<string, unknown>[]>
+  pending: () => Promise<number>
+}
+
 export const settingsKey = "settings.v3"
 
 const seedModel = (() => {
@@ -26,6 +47,7 @@ const seedModel = (() => {
 })()
 
 type TestFixtures = {
+  llm: LLMFixture
   sdk: ReturnType<typeof createSdk>
   gotoSession: (sessionID?: string) => Promise<void>
   withProject: <T>(
@@ -36,7 +58,11 @@ type TestFixtures = {
       trackSession: (sessionID: string, directory?: string) => void
       trackDirectory: (directory: string) => void
     }) => Promise<T>,
-    options?: { extra?: string[] },
+    options?: {
+      extra?: string[]
+      model?: { providerID: string; modelID: string }
+      setup?: (directory: string) => Promise<void>
+    },
   ) => Promise<T>
 }
 
@@ -46,6 +72,31 @@ type WorkerFixtures = {
 }
 
 export const test = base.extend<TestFixtures, WorkerFixtures>({
+  llm: async ({}, use) => {
+    const rt = ManagedRuntime.make(TestLLMServer.layer)
+    try {
+      const svc = await rt.runPromise(TestLLMServer.asEffect())
+      await use({
+        url: svc.url,
+        push: (...input) => rt.runPromise(svc.push(...input)),
+        text: (value, opts) => rt.runPromise(svc.text(value, opts)),
+        tool: (name, input) => rt.runPromise(svc.tool(name, input)),
+        toolHang: (name, input) => rt.runPromise(svc.toolHang(name, input)),
+        reason: (value, opts) => rt.runPromise(svc.reason(value, opts)),
+        fail: (message) => rt.runPromise(svc.fail(message)),
+        error: (status, body) => rt.runPromise(svc.error(status, body)),
+        hang: () => rt.runPromise(svc.hang),
+        hold: (value, wait) => rt.runPromise(svc.hold(value, wait)),
+        hits: () => rt.runPromise(svc.hits),
+        calls: () => rt.runPromise(svc.calls),
+        wait: (count) => rt.runPromise(svc.wait(count)),
+        inputs: () => rt.runPromise(svc.inputs),
+        pending: () => rt.runPromise(svc.pending),
+      })
+    } finally {
+      await rt.dispose()
+    }
+  },
   page: async ({ page }, use) => {
     let boundary: string | undefined
     setHealthPhase(page, "test")
@@ -99,7 +150,8 @@ export const test = base.extend<TestFixtures, WorkerFixtures>({
       const root = await createTestProject()
       const sessions = new Map<string, string>()
       const dirs = new Set<string>()
-      await seedStorage(page, { directory: root, extra: options?.extra })
+      await options?.setup?.(root)
+      await seedStorage(page, { directory: root, extra: options?.extra, model: options?.model })
 
       const gotoSession = async (sessionID?: string) => {
         await page.goto(sessionPath(root, sessionID))
@@ -133,7 +185,14 @@ export const test = base.extend<TestFixtures, WorkerFixtures>({
   },
 })
 
-async function seedStorage(page: Page, input: { directory: string; extra?: string[] }) {
+async function seedStorage(
+  page: Page,
+  input: {
+    directory: string
+    extra?: string[]
+    model?: { providerID: string; modelID: string }
+  },
+) {
   await seedProjects(page, input)
   await page.addInitScript((model: { providerID: string; modelID: string }) => {
     const win = window as E2EWindow
@@ -158,7 +217,7 @@ async function seedStorage(page: Page, input: { directory: string; extra?: strin
         variant: {},
       }),
     )
-  }, seedModel)
+  }, input.model ?? seedModel)
 }
 
 export { expect }
-- 
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