// Runs jest with the arguments it is given, and fails the run when jest had to
// force-stop the worker process that ran a test file. Jest itself only prints a
// warning when that happens, and its run still passes. The warning means a test
// left a timer or another open handle running. The test scripts in package.json
// run jest through this file.
//
// Jest runs inside this process and writes to the terminal directly, so its
// output looks the same as a plain jest run. This file only checks each write
// to stderr for the warning below.

"use strict";

// The start of the warning that jest prints on stderr after it force-stops a
// worker process.
const WORKER_WARNING = "A worker process has failed to exit gracefully";

let forceStopped = false;

const writeStderr = process.stderr.write.bind(process.stderr);
process.stderr.write = (chunk, ...rest) => {
    if (String(chunk).includes(WORKER_WARNING)) {
        forceStopped = true;
    }
    return writeStderr(chunk, ...rest);
};

// Runs after jest has finished, as the process exits.
process.on("exit", () => {
    if (forceStopped) {
        console.error(
            "script/lib/jest.js: failing the run, because jest force-stopped " +
                "a worker process. A test left a timer or another open " +
                "handle running.",
        );
        process.exitCode = 1;
    }
});

// Jest's own command-line program. It reads its arguments from process.argv.
require("jest/bin/jest");