Issue 4223 - Migrate some more of adblockplustests

test/stub-modules/common.js

+let path = require("path");
+let SandboxedModule = require("sandboxed-module");
+
+let globals = {
+  atob: data => new Buffer(data, "base64").toString("binary"),
+  btoa: data => new Buffer(data, "binary").toString("base64"),
+  Ci: {},
+  Cu: {import: () => { }},
+  navigator: {},
+  onShutdown: {add: () => { }},
+  Services: {obs: {addObserver: () => { }}},
+  XPCOMUtils: {generateQI: () => { }}
+};
+
+function addExports(exports)
+{
+  // Unfortunately there's not a way for a source transformer to know the name
+  // of the module being transformed. This means we must add all extra exports
+  // to all modules, not ideal!
+  let code = "if (!('EXPORT' in exports))\n" +
+             "  Object.defineProperty(exports, 'EXPORT', {get: () => EXPORT});";
+
+  return src => src + "\n" + exports.
+    map(name => code.replace(/EXPORT/g, name)).join("\n");
+}
+
+function rewriteRequires(source)
+{
+  // Taken from EasyPasswords

[kzar, 2016/09/29 18:19:38]

I modified this logic quite a bit since I took it from EasyPasswords. Should I
keep this comment or not?

+  // https://github.com/palant/easypasswords/blob/master/gulp-utils.js
+  let modules = new Set(["events", "io"]);
+  return source.replace(/(\brequire\(["'])([^"']+)/g, (match, prefix, request) =>
+  {
+    if (modules.has(request))
+      return prefix + request + ".js";
+    return match;
+  });
+}
+
+function libPath(moduleId)
+{
+  return path.resolve(__dirname, "..", "..", "lib", moduleId + ".js");
+}
+
+exports.createSandbox = function(extraExports)
+{
+  // Shared require cache for this sandbox
+  let cache = {};
+
+  let options = {
+    cache: cache,
+    globals: globals,
+    sourceTransformers: [rewriteRequires]
+  };
+  if (extraExports)
+    options.sourceTransformers.push(addExports(extraExports));
+
+  return (moduleId, exports) =>
+  {
+    let key = libPath(moduleId);
+
+    // Only load modules which aren't already cached for this sandbox
+    if (!(key in cache))
+      cache[key] = SandboxedModule.require(moduleId, options);
+
+    return cache[key];
+  };
+};