text: var UrbanAirship = require("nativescript-urban-airship").UrbanAirship;
  var urbanAirship = new UrbanAirship();
  
  describe("greet function", function() {
      it("exists", function() {
          expect(urbanAirship.greet).toBeDefined();
      });
  
      it("returns a string", function() {
          expect(urbanAirship.greet()).toEqual("Hello, NS");
      });
  });