tests.ts

import assert from "node:assert";
import fs from "node:fs";
import path from "node:path";

import { spawnTest } from "./child_process.js";

assert(
  typeof import.meta.dirname === "string",
  "Expecting a recent Node.js runtime API version"
);

const ROOT_PATH = path.resolve(import.meta.dirname, "..", "..");
const TESTS_ROOT_PATH = path.join(ROOT_PATH, "tests");

export function listDirectoryEntries(dir: string) {
  const entries = fs.readdirSync(dir, { withFileTypes: true });
  const directories: string[] = [];
  const files: string[] = [];

  for (const entry of entries) {
    if (entry.isDirectory()) {
      directories.push(entry.name);
    } else if (entry.isFile() && entry.name.endsWith(".js")) {
      files.push(entry.name);
    }
  }

  directories.sort();
  files.sort();

  return { directories, files };
}

export function runFileInSubprocess(cwd: string, filePath: string): void {
  const { status, signal, stdout, stderr } = spawnTest(filePath, {
    cwd,
    nodeFlags: ["--expose-gc"],
  });

  if (stdout) process.stdout.write(stdout);

  if (status === 0) return;

  const reason =
    status !== null ? `exit code ${status}` : `signal ${signal ?? "unknown"}`;
  const trimmedStderr = stderr.trim();
  const stderrSuffix = trimmedStderr
    ? `\n--- stderr ---\n${trimmedStderr}\n--- end stderr ---`
    : "";
  throw new Error(
    `Test file ${path.relative(
      TESTS_ROOT_PATH,
      path.join(cwd, filePath)
    )} failed (${reason})${stderrSuffix}`
  );
}