import { expect, test } from "bun:test";
import { getIslandRuntime } from "../src/runtime-source.ts";

test("emits a runtime that bails out when no island markers exist", () => {
  const source = getIslandRuntime(false);
  expect(source).toContain("data-wrn-island");
  expect(source).toContain("/__wrnexus/island/");
});

test("registers a navigation hook so islands unmount on route change", () => {
  expect(getIslandRuntime(false)).toContain("__wrnexusUnmountIslands");
});

test("never references react-dom/server", () => {
  expect(getIslandRuntime(true)).not.toContain("react-dom/server");
});

test("threads the development flag into the mount options", () => {
  expect(getIslandRuntime(true)).toContain("development: true");
  expect(getIslandRuntime(false)).toContain("development: false");
});

test("encodes the island name before using it as a URL path segment", () => {
  expect(getIslandRuntime(false)).toContain("encodeURIComponent");
});

test("the runtime remounts islands after an HMR update", () => {
  // HMR morphs the server placeholder over the mounted island, discarding the
  // React tree; without this the island silently disappears on every edit.
  const source = getIslandRuntime(true);
  expect(source).toContain("wrnexus:hmr-updated");
  expect(source).toContain("__wrnexusRemountIslands");
});