// Selfhost browser regression for the reported PostHog MCP OAuth dead-end. A// real Executor instance adds https://mcp.posthog.com/mcp, then starts the// connection flow. The product guarantee: clicking Connect opens PostHog's// OAuth authorization page through dynamic client registration, not the// bring-your-own OAuth app picker with "Automatic setup unavailable".import { randomBytes } from "node:crypto"; import { expect } from "@effect/vitest";import { Effect } from "effect";import { composePluginApi } from "@executor-js/api/server";import { deriveMcpNamespace } from "@executor-js/plugin-mcp";import { mcpHttpPlugin } from "@executor-js/plugin-mcp/api";import { IntegrationSlug } from "@executor-js/sdk/shared"; import { scenario } from "../src/scenario";import { Api, Browser, Target } from "../src/services"; const POSTHOG_MCP_URL = "https://mcp.posthog.com/mcp";const api = composePluginApi([mcpHttpPlugin()] as const); scenario(  "MCP OAuth · PostHog starts OAuth from Add connection",  { timeout: 180_000 },  Effect.scoped(    Effect.gen(function* () {      const target = yield* Target;      const browser = yield* Browser;      const { client: makeApiClient } = yield* Api;      const identity = yield* target.newIdentity();      const client = yield* makeApiClient(api, identity);      const displayName = `PostHog MCP ${randomBytes(3).toString("hex")}`;      const slug = IntegrationSlug.make(deriveMcpNamespace({ name: displayName }));       yield* Effect.gen(function* () {        yield* browser.session(identity, async ({ page, step }) => {          await step("Open the add-MCP flow pointed at PostHog", async () => {            const addUrl = new URL("/integrations/add/mcp", target.baseUrl);            addUrl.searchParams.set("url", POSTHOG_MCP_URL);            await page.goto(addUrl.toString(), { waitUntil: "networkidle" });            await page.getByText("How does this server authenticate?").waitFor({ timeout: 30_000 });            await page.getByText("Method 1 · Detected").waitFor();            await page.getByText("OAuth metadata is discovered from this server").waitFor();          });           await step("Add the PostHog MCP integration", async () => {            await page.getByPlaceholder("e.g. Linear").fill(displayName);            await page.getByRole("button", { name: "Add integration" }).click();            await page.waitForURL(/\/integrations\/(?!add\b)[^/?]+$/, { timeout: 30_000 });            const landedSlug = new URL(page.url()).pathname.split("/").filter(Boolean).at(-1);            expect(landedSlug, "the add flow lands on the created integration").toBe(String(slug));            await page.getByText("Connections").first().waitFor();          });           await step("Start OAuth from Add connection", async () => {            await page.getByRole("button", { name: "Add connection" }).first().click();            await page.getByRole("heading", { name: /Add connection/ }).waitFor();            await page.getByRole("tab", { name: "OAuth" }).waitFor();             const popupPromise = page.waitForEvent("popup", { timeout: 30_000 });            await page.getByRole("button", { name: "Connect", exact: true }).click();            const popup = await popupPromise;            await popup.waitForURL(/^https:\/\/oauth\.posthog\.com\/oauth\/authorize\//, {              timeout: 30_000,            });            await popup.waitForLoadState("domcontentloaded", { timeout: 30_000 });             const authorizeUrl = new URL(popup.url());            expect(authorizeUrl.origin, "OAuth opened PostHog's authorization host").toBe(              "https://oauth.posthog.com",            );            expect(authorizeUrl.pathname, "OAuth opened the authorize endpoint").toBe(              "/oauth/authorize/",            );            expect(              authorizeUrl.searchParams.get("resource"),              "resource targets the MCP endpoint",            ).toBe(POSTHOG_MCP_URL);            await popup.close();          });        });      }).pipe(Effect.ensuring(client.mcp.removeServer({ params: { slug } }).pipe(Effect.ignore)));    }),  ),);