marko/packages/runtime-class/test/api-compiler/fixtures/configure-singleton/test.js

exports.check = function (marko, markoCompiler, expect, helpers, done) {
  var configModulePath = require.resolve("marko/compiler/config");
  var config = require(configModulePath);

  var globalConfig = global.__MARKO_CONFIG;
  expect(config).to.equal(globalConfig);

  delete require.cache[configModulePath];

  config = require(configModulePath);
  expect(config).to.equal(globalConfig);

  done();
};