test/script/basic/JDK-8014785.js

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/**
 * JDK-8014785: Ability to extend global instance by binding properties of another object
 *
 * @test
 * @run
 */

var obj = { x: 34, y: 100 };
var foo = {}

// bind properties of "obj" to "foo" obj
Object.bindProperties(foo, obj);

// now we can access/write on foo properties
print("foo.x = " + foo.x); // prints obj.x which is 34

// update obj.x via foo.x
foo.x = "hello";
print("obj.x = " + obj.x); // prints "hello" now

obj.x = 42;   // foo.x also becomes 42
print("obj.x = " + obj.x); // prints 42
print("foo.x = " + foo.x); // prints 42

// now bind a mirror object to an object
var obj = loadWithNewGlobal({
  name: "test",
  script: "obj = { x: 33, y: 'hello' }"
});

Object.bindProperties(this, obj);
print("x = " + x); // prints 33
print("y = " + y); // prints "hello"

x = Math.PI;               // changes obj.x to Math.PI
print("obj.x = " +obj.x);  // prints Math.PI

obj.y = 32;
print("y = " + y);  // should print 32