Issue 4223 - Migrate some more of adblockplustests

test/common.js

Index: test/common.js
diff --git a/test/common.js b/test/common.js
new file mode 100644
index 0000000000000000000000000000000000000000..f05f7e4d7d5ec387e60e575ace1f236a49946a59
--- /dev/null
+++ b/test/common.js
@@ -0,0 +1,106 @@
+/*
+ * This file is part of Adblock Plus <https://adblockplus.org/>,
+ * Copyright (C) 2006-2016 Eyeo GmbH
+ *
+ * Adblock Plus is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 3 as
+ * published by the Free Software Foundation.
+ *
+ * Adblock Plus is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+"use strict";
+
+let fs = require("fs");
+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: () =>
+    {
+    }
+  }
+};
+
+let knownModules = new Map();
+for (let dir of [path.join("test", "stub-modules"), "lib"])
+  for (let file of fs.readdirSync(path.resolve(dir)))
+    if (path.extname(file) == ".js")
+      knownModules[path.basename(file, ".js")] = path.resolve(dir, file);
+
+function addExports(exports)
+{
+  return function(source)
+  {
+    let extraExports = exports[path.basename(this.filename, ".js")];
+    if (extraExports)
+     for (let name of extraExports)
+       source += `
+         Object.defineProperty(exports, "${name}", {get: () => ${name}});`;
+    return source;
+  };
+}
+
+function rewriteRequires(source)
+{
+  function escapeString(str)
+  {
+    return str.replace(/(["'\\])/g, "\\$1");
+  }
+
+  return source.replace(/(\brequire\(["'])([^"']+)/g, (match, prefix, request) =>
+  {
+    if (request in knownModules)
+      return prefix + escapeString(knownModules[request]);
+    return match;
+  });
+}
+
+exports.createSandbox = function(extraExports)
+{
+  let sourceTransformers = [rewriteRequires];
+  if (extraExports)
+    sourceTransformers.push(addExports(extraExports));
+
+  // This module loads itself into a sandbox, keeping track of the require
+  // function which can be used to load further modules into the sandbox.
+  // (Before returning the require function we wrap it, allowing paths for known
+  //  modules to be omitted for convenience.)
+  let sandboxedRequire = SandboxedModule.require("./common", {
+    globals: globals,
+    sourceTransformers: sourceTransformers
+  }).require;
+  return module => sandboxedRequire(knownModules[module] || module);
+};
+
+exports.require = require;