test_getObjectPrincipal.js

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function run_test() {

  Assert.ok(Cu.getObjectPrincipal({}).isSystemPrincipal);

  var sb = new Cu.Sandbox('http://www.example.com');

  Cu.evalInSandbox('var obj = { foo: 42 };', sb);

  Assert.equal(Cu.getObjectPrincipal(sb.obj).origin, 'http://www.example.com');