import { describe, expect, it } from "vitest";

import { runLighthouse } from "./run-lighthouse.mjs";

function createStream() {
  let output = "";
  return {
    stream: { write: (chunk) => { output += chunk; } },
    get output() {
      return output;
    },
  };
}

describe("run-lighthouse", () => {
  it("skips cleanly when npx is unavailable", () => {
    const stdout = createStream();
    const exitCode = runLighthouse({
      spawn: () => ({ error: { code: "ENOENT" }, stdout: "", stderr: "", status: null }),
      stdout: stdout.stream,
      stderr: createStream().stream,
    });

    expect(exitCode).toBe(0);
    expect(stdout.output).toContain("SKIP lhci not installable");
  });

  it("skips cleanly when Chrome is unavailable", () => {
    const stdout = createStream();
    const exitCode = runLighthouse({
      spawn: () => ({ stdout: "Chrome installation not found\nHealthcheck failed!\n", stderr: "", status: 1 }),
      stdout: stdout.stream,
      stderr: createStream().stream,
    });

    expect(exitCode).toBe(0);
    expect(stdout.output).toContain("SKIP Chrome not installed");
  });

  it("returns the lhci exit status for real failures", () => {
    const exitCode = runLighthouse({
      spawn: () => ({ stdout: "assertion failed\n", stderr: "", status: 1 }),
      stdout: createStream().stream,
      stderr: createStream().stream,
    });

    expect(exitCode).toBe(1);
  });
});