text: var ProcessButton = require("nativescript-process-button").ProcessButton;
  var processButton = new ProcessButton();
  
  describe("greet function", function() {
      it("exists", function() {
          expect(processButton.greet).toBeDefined();
      });
  
      it("returns a string", function() {
          expect(processButton.greet()).toEqual("Hello, NS");
      });
  });