text: // Do this as the first thing so that any code reading it knows the right env.
  process.env.BABEL_ENV = "test";
  process.env.NODE_ENV = "test";
  process.env.PUBLIC_URL = "";
  
  // Makes the script crash on unhandled rejections instead of silently
  // ignoring them. In the future, promise rejections that are not handled will
  // terminate the Node.js process with a non-zero exit code.
  process.on("unhandledRejection", err => {
    throw err;
  });
  
  const jest = require("jest");
  const execSync = require("child_process").execSync;
  let argv = process.argv.slice(2);
  
  function isInGitRepository() {
    try {
      execSync("git rev-parse --is-inside-work-tree", { stdio: "ignore" });
      return true;
    } catch (e) {
      return false;
    }
  }
  
  function isInMercurialRepository() {
    try {
      execSync("hg --cwd . root", { stdio: "ignore" });
      return true;
    } catch (e) {
      return false;
    }
  }
  
  // Watch unless on CI or explicitly running all tests
  if (!process.env.CI && argv.indexOf("--watchAll") === -1) {
    // https://github.com/facebook/create-react-app/issues/5210
    const hasSourceControl = isInGitRepository() || isInMercurialRepository();
    argv.push(hasSourceControl ? "--watch" : "--watchAll");
  }
  
  jest.run(argv);
  