Add testing harness that replicates FastBoot environment.

Prior to this we were simulating FastBoot in a non-isolated VM context.
That meant that the running Node context was available within rendering
attempts. However, when ran with "real" FastBoot that is **not** the
case. In the real FastBoot environment, we create an isolated `vm`
context and evaluate both Ember and the application within that context.
This ensures that the running context does not have access to arbitrary
Node-land APIs (e.g. `require`).

.eslintrc.js

@@ -166,20 +166,6 @@ module.exports = {
         'disable-features/disable-generator-functions': 'off',
       }),
     },
-    {
-      // matches node-land files that aren't shipped to consumers (allows using Node 6+ features)
-      files: [
-        'broccoli/**/*.js',
-        'tests/node/**/*.js',
-        'ember-cli-build.js',
-        'rollup.config.js',
-        'd8-runner.js',
-      ],
-
-      rules: {
-        'node/no-unsupported-features': ['error', { version: 6 }],
-      }
-    },
     {
       files: [ 'node-tests/**/*.js' ],
 

tests/node/component-rendering-test.js

@@ -33,4 +33,12 @@ QUnit.module('Components can be rendered without a DOM dependency', function(hoo
 
     assert.ok(html.match(/rel="canonical"/));
   });
+
+  QUnit.test('attributes requiring protocol sanitization do not error', function(assert) {
+    this.set('someHref', 'https://foo.com/');
+
+    let html = this.render('<a href={{this.someHref}}>Some Link</a>');
+
+    assert.ok(html.match(/<a href="https:\/\/foo.com\/">Some Link<\/a>/));
+  });
 });

tests/node/fastboot-sandbox-test.js

@@ -0,0 +1,137 @@
+const fs = require('fs');
+const vm = require('vm');
+const SimpleDOM = require('simple-dom');
+const { emberPath, loadEmber, clearEmber } = require('./helpers/load-ember');
+
+function assertHTMLMatches(assert, actualHTML, expectedHTML) {
+  assert.ok(actualHTML.match(expectedHTML), actualHTML + ' matches ' + expectedHTML);
+}
+
+function handleError(assert) {
+  return function(error) {
+    assert.ok(false, error.stack);
+  };
+}
+
+// This is based on what fastboot-server does
+let HTMLSerializer = new SimpleDOM.HTMLSerializer(SimpleDOM.voidMap);
+
+async function fastbootVisit(context, url) {
+  let doc = new SimpleDOM.Document();
+  let rootElement = doc.body;
+  let options = { isBrowser: false, document: doc, rootElement: rootElement };
+
+  let { app } = context;
+
+  await app.boot();
+
+  let instance = await app.buildInstance();
+
+  try {
+    await instance.boot(options);
+    await instance.visit(url, options);
+
+    return {
+      url: instance.getURL(),
+      title: doc.title,
+      body: HTMLSerializer.serialize(rootElement),
+    };
+  } finally {
+    instance.destroy();
+  }
+}
+
+function assertFastbootResult(assert, expected) {
+  return function(actual) {
+    assert.equal(actual.url, expected.url);
+    assertHTMLMatches(assert, actual.body, expected.body);
+  };
+}
+
+// essentially doing the same as what is done in FastBoot 3.1.0
+// https://github.com/ember-fastboot/fastboot/blob/v3.1.0/src/sandbox.js
+function buildSandboxContext(precompile) {
+  let URL = require('url');
+
+  let sandbox = {
+    console,
+    setTimeout,
+    clearTimeout,
+    URL,
+
+    // Convince jQuery not to assume it's in a browser
+    module: { exports: {} },
+  };
+
+  // Set the global as `window`
+  sandbox.window = sandbox;
+  sandbox.window.self = sandbox;
+
+  let context = vm.createContext(sandbox);
+
+  let environmentSetupScript = new vm.Script(
+    `
+var EmberENV = {
+  _TEMPLATE_ONLY_GLIMMER_COMPONENTS: true,
+  _APPLICATION_TEMPLATE_WRAPPER: false,
+  _DEFAULT_ASYNC_OBSERVERS: true,
+  _JQUERY_INTEGRATION: false,
+};`,
+    { filename: 'prepend.js' }
+  );
+  environmentSetupScript.runInContext(context);
+
+  let emberSource = fs.readFileSync(emberPath, { encoding: 'utf-8' });
+  let emberScript = new vm.Script(emberSource, { filename: emberPath });
+  emberScript.runInContext(context);
+
+  let applicationSource = `
+class Router extends Ember.Router {}
+Router.map(function() {
+  this.route('a');
+  this.route('b');
+});
+
+const registry = {
+  'router:main': Router,
+  'template:application': ${precompile('<h1>Hello world!</h1>\n{{outlet}}')}
+};
+
+class Resolver extends Ember.Object {
+  resolve(specifier) {
+    return registry[specifier];
+  }
+}
+
+var app = Ember.Application.extend().create({
+  autoboot: false,
+  Resolver,
+});
+`;
+  let appScript = new vm.Script(applicationSource, { filename: 'app.js' });
+  appScript.runInContext(context);
+
+  return context;
+}
+
+QUnit.module('Ember.Application - visit() Integration Tests', function(hooks) {
+  hooks.beforeEach(function() {
+    let { precompile } = loadEmber();
+    this.context = buildSandboxContext(precompile);
+  });
+
+  hooks.afterEach(function() {
+    clearEmber();
+  });
+
+  QUnit.test('FastBoot: basic', async function(assert) {
+    let result = await fastbootVisit(this.context, '/');
+
+    assert.equal(result.url, '/', 'landed on correct url');
+    assert.equal(
+      result.body,
+      '<body><h1>Hello world!</h1>\n<!----></body>',
+      'results in expected HTML'
+    );
+  });
+});

tests/node/helpers/load-ember.js

@@ -7,19 +7,27 @@ const templateCompilerPath = path.join(distPath, 'ember-template-compiler');
 // properly to avoid the @glimmer/validator assertion
 const originalGlobalSymbols = Object.getOwnPropertySymbols(global).map(sym => [sym, global[sym]]);
 
+module.exports.emberPath = require.resolve(emberPath);
+
 module.exports.loadEmber = function() {
   let Ember = require(emberPath);
 
-  let precompile = require(templateCompilerPath).precompile;
+  let _precompile = require(templateCompilerPath).precompile;
+
+  let precompile = function(templateString, options) {
+    let templateSpec = _precompile(templateString, options);
+
+    return `Ember.HTMLBars.template(${templateSpec})`;
+  };
 
   let compile = function(templateString, options) {
-    let templateSpec = precompile(templateString, options);
+    let templateSpec = _precompile(templateString, options);
     let template = new Function('return ' + templateSpec)();
 
     return Ember.HTMLBars.template(template);
   };
 
-  return { Ember, compile };
+  return { Ember, compile, precompile };
 };
 
 module.exports.clearEmber = function() {