test/mjsunit/global-properties.js

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var global = this;

function testNamedProperty(key, value) {
  global[key] = value;
  assertTrue(global.hasOwnProperty(key));
  assertTrue(-1 < Object.keys(global).indexOf(key));
  assertTrue(-1 < Object.getOwnPropertyNames(global).indexOf(key));
  assertTrue(-1 == Object.getOwnPropertySymbols(global).indexOf(key));
}

testNamedProperty('property0', 'value');
testNamedProperty('0property', 'value');
testNamedProperty('42', 'value');

function testNamedNonEnumerableProperty(key, value) {
  Object.defineProperty(global, key, {
    enumerable: false,
    value: value
  });
  assertTrue(global.hasOwnProperty(key));
  assertTrue(-1 == Object.keys(global).indexOf(key));
  assertTrue(-1 < Object.getOwnPropertyNames(global).indexOf(key));
  assertTrue(-1 == Object.getOwnPropertySymbols(global).indexOf(key));
}

testNamedNonEnumerableProperty('property1', 'value');
testNamedNonEnumerableProperty('1property', 'value');
testNamedNonEnumerableProperty('43', 'value');

function testSymbolProperty(key, value) {
  key = Symbol(key);
  global[key] = value;
  assertTrue(global.hasOwnProperty(key));
  assertTrue(-1 == Object.keys(global).indexOf(key));
  assertTrue(-1 == Object.getOwnPropertyNames(global).indexOf(key));
  assertTrue(-1 < Object.getOwnPropertySymbols(global).indexOf(key));
}

testSymbolProperty('property2', 'value');
testSymbolProperty('2property', 'value');
testSymbolProperty('43', 'value');