In the sample test for javascript, the test is for 1 and 2, not 1 and 3.

Test.describe("addBinary(1,2)", function() {
  var results1 = addBinary(1,2);
  Test.it("Should return something that isn't falsy", function() {
    Test.expect(results1, "Something is wrong, no results!");
  });
  Test.it("Should return \"11\"", function() {
    Test.assertEquals(results1, "11");
  });
});

See?