运用D.O.H进行Javascript应用程序测试(一)

dojo.provide("demo.doh.demoFunctions");

//This file contains a collection of helper functions that are not
//part of any defined dojo class.

demo.doh.demoFunctions.alwaysTrue = function() {
  //  summary:
  //    A simple demo helper function that always returns the boolean true when 
  //    called.
  //  description:
  //    A simple demo helper function that always returns the boolean true when 
  //    called.
  return true; // boolean.
};

demo.doh.demoFunctions.alwaysFalse = function() {
  //  summary:
  //    A simple demo helper function that always returns the boolean false when 
  //    called.
  //  description:
  //    A simple demo helper function that always returns the boolean false when 
  //    called.
  return false; // boolean.
};

demo.doh.demoFunctions.isTrue = function(/* anything */ thing) {
  //  summary:
  //    A simple demo helper function that returns true if the thing passed in is
  //     logically true.
  //  description:
  //    A simple demo helper function that returns true if he thing passed in is 
  //    logically true.
  //    This means that for any defined objects, or Boolean  values of true, it 
  //    should return true,
  //    For undefined, null, 0, or false, it returns false.
  //  thing:
  //    Anything.  Optional argument.
  var type = typeof thing;
  if (type === "undefined" || thing === null || thing === 0 || thing === false) {
    return false; //boolean
  }
  return true; // Boolean
};

demo.doh.demoFunctions.asyncEcho = function(/* function */ callback,
                                                    /* string */ message){ 
  //  summary:
  //    A simple demo helper function that does an asynchronous echo 
//     of a message.
  //  description:  
  //    A simple demo helper function that does an asynchronous echo 
//      of a message.
  //    The callback function is called and passed parameter 'message' 
//       two seconds 
  //    after this helper is called.
  //  callback:
  //    The function to call after waiting two seconds.  Takes one
//       parameter, 
  //    a string message.
  //  message:
  //    The message to pass to the callback function.
  if (dojo.isFunction(callback)) {
    var handle;
    var caller = function() {
      callback(message);
      clearTimeout(handle);
      handle = null;
    };
    handle = setTimeout(caller, 2000);
  }
};

dojo.provide("demo.doh.tests.functions.demoFunctions");

//Import in the code being tested.
dojo.require("demo.doh.demoFunctions");

doh.register("demo.doh.tests.functions.demoFunctions", [
     function test_alwaysTrue(){
          //     summary:
          //          A simple test of the alwaysTrue function
          //     description:
          //          A simple test of the alwaysTrue function
          doh.assertTrue(demo.doh.demoFunctions.alwaysTrue());
     },
     function test_alwaysFalse(){
          //     summary:
          //          A simple test of the alwaysFalse function
          //     description:
          //          A simple test of the alwaysFalse function
          doh.assertTrue(!demo.doh.demoFunctions.alwaysFalse());
     },
     function test_isTrue(){
          //     summary:
          //          A simple test of the isTrue function
          //     description:
          //          A simple test of the isTrue function with multiple permutations of 
           //          calling it.
          doh.assertTrue(demo.doh.demoFunctions.isTrue(true));
          doh.assertTrue(!demo.doh.demoFunctions.isTrue(false));
          doh.assertTrue(demo.doh.demoFunctions.isTrue({}));
          doh.assertTrue(!demo.doh.demoFunctions.isTrue());
          doh.assertTrue(!demo.doh.demoFunctions.isTrue(null));
          doh.assertTrue(!demo.doh.demoFunctions.isTrue(0));
     },
     {
          //This is a full test fixture instead of a stand-alone test function.  
          //Therefore, it allows over-riding of the timeout period for a deferred test.  
          //You can also define setup and teardown function
          //for complex tests, but they are unnecessary here.
          name: "test_asyncEcho",
          timeout: 5000, // 5 seconds.
          runTest: function() {
               //     summary:
               //          A simple async test of the asyncEcho function.
               //     description:
               //          A simple async test of the asyncEcho function.
               var deferred = new doh.Deferred();
               var message  = "Success";
               function callback(string){
                    try {
                         doh.assertEqual(message, string);
                         deferred.callback(true);
                    } catch (e) {
                         deferred.errback(e);
                    }
               }
               demo.doh.demoFunctions.asyncEcho(callback, message);
               return deferred;      //Return the deferred.  DOH will 
                                     //wait on this object for one of the callbacks to 
                                     //be called, or for the timeout to expire.
          }
     }
]);