Sample buster test case inside a closure

buster.js

exports.Browser = {
    tests: ["closure-bug-test.js"]
};

closure-bug-test.js

(function (win, doc) {
    function setup() {
    }

    function teardown() {
    }

    buster.testCase( "SampleTest", {
        setUp: setup,
	tearDown: teardown,
	"test should check that doc is the same as window.document": function () {
	    assert.equals( window.document, doc );
	}
    });
}(window, document));