node/test/parallel/test-repl-reset-event.js

// Copyright Joyent, Inc. and other Node contributors.
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'use strict';
const common = require('../common');
const assert = require('assert');
const util = require('util');
const { startNewREPLServer } = require('../common/repl');

common.allowGlobals(42);

function testReset(cb) {
  const { replServer } = startNewREPLServer();
  replServer.context.foo = 42;
  replServer.on('reset', common.mustCall(function(context) {
    assert(!!context, 'REPL did not emit a context with reset event');
    assert.strictEqual(context, replServer.context, 'REPL emitted incorrect context. ' +
    `context is ${util.inspect(context)}, expected ${util.inspect(replServer.context)}`);
    assert.strictEqual(
      context.foo,
      undefined,
      'REPL emitted the previous context and is not using global as context. ' +
      `context.foo is ${context.foo}, expected undefined.`
    );
    context.foo = 42;
    cb();
  }));
  replServer.resetContext();
}

function testResetGlobal() {
  const { replServer } = startNewREPLServer({ useGlobal: true });
  replServer.context.foo = 42;
  replServer.on('reset', common.mustCall(function(context) {
    assert.strictEqual(
      context.foo,
      42,
      '"foo" property is different from REPL using global as context. ' +
      `context.foo is ${context.foo}, expected 42.`
    );
  }));
  replServer.resetContext();
}

testReset(common.mustCall(testResetGlobal));