Add tests for _.transform and objects from other realms.

test/test.js

@@ -367,7 +367,8 @@
     try {
       // add values from a different realm
       _.extend(_, require('vm').runInNewContext([
-        '({',
+        '(function() {',
+        ' var object = {',
         "  '_arguments': (function() { return arguments; }(1, 2, 3)),",
         "  '_array': [1, 2, 3],",
         "  '_boolean': Object(false),",
@@ -381,7 +382,17 @@
         "  '_regexp': /x/,",
         "  '_string': Object('a'),",
         "  '_undefined': undefined",
-        '})'
+        '  };',
+        '',
+        "  ['" + typedArrays.join("', '") + "'].forEach(function(type) {",
+        "    var Ctor = Function('return typeof ' + type + \" != 'undefined' && \" + type)()",
+        '    if (Ctor) {',
+        "      object['_' + type.toLowerCase()] = new Ctor(new ArrayBuffer(24));",
+        '    }',
+        "  });",
+        '',
+        '  return object;',
+        '}())'
       ].join('\n')));
     }
     catch(e) {
@@ -583,6 +594,14 @@
       'parent._._regexp = /x/;',
       "parent._._string = Object('a');",
       'parent._._undefined = undefined;',
+      '',
+      'var root = this;',
+      "parent._.each(['" + typedArrays.join("', '") + "'], function(type) {",
+      '  var Ctor = root[type];',
+      '  if (Ctor) {',
+      "    parent._['_' + type.toLowerCase()] = new Ctor(new ArrayBuffer(24));",
+      '  }',
+      '});',
       '<\/script>'
     ].join('\n'));
     idoc.close();
@@ -11586,6 +11605,30 @@
         deepEqual(actual, object);
       });
     });
+
+    test('should produce an object from the same realm as `object`', 1, function() {
+      var objects = _.transform(_, function(result, value, key) {
+        if (_.startsWith(key, '_') && _.isObject(value)) {
+          result.push(value);
+        }
+      }, []);
+
+      var expected = _.times(objects.length, _.constant(true));
+
+      var actual = _.map(objects, function(object) {
+        var result = _.transform(object);
+        if (result === object) {
+          return false;
+        }
+        if (typeof object.length == 'number' &&
+            !_.isArray(object) && !_.isFunction(object) && !_.isString(object)) {
+          return result instanceof Array;
+        }
+        return result instanceof object.constructor;
+      });
+
+      deepEqual(actual, expected);
+    });
   }());
 
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