Decoupling gist-handler from query-params; Testing gist-handler

src/app.js

@@ -5,7 +5,8 @@ var $ = require('jquery');
 var utils = require('./app/utils');
 var QueryParams = require('./app/query-params');
 var queryParams = new QueryParams();
-var gistHandler = require('./app/gist-handler');
+var GistHandler = require('./app/gist-handler');
+var gistHandler = new GistHandler();
 
 var StorageHandler = require('./app/storage-handler');
 var Editor = require('./app/editor');
@@ -62,7 +63,7 @@ var run = function () {
 
   // ------------------ gist load ----------------
 
-  var loadingFromGist = gistHandler.handleLoad(function (gistId) {
+  var loadingFromGist = gistHandler.handleLoad(queryParams.get(), function (gistId) {
     $.ajax({
       url: 'https://api.github.com/gists/' + gistId,
       jsonp: 'callback',

src/app/gist-handler.js

-/* global prompt */
+// Allowing window to be overriden for testing
+function GistHandler (_window) {
+  if (_window === undefined) _window = window;
 
-var QueryParams = require('./query-params');
-var queryParams = new QueryParams();
-
-function handleLoad (cb) {
-  var params = queryParams.get();
-  var loadingFromGist = false;
-  if (typeof params['gist'] !== undefined) { // testme
+  this.handleLoad = function (params, cb) {
+    var loadingFromGist = false;
     var gistId;
     if (params['gist'] === '') {
-      var str = prompt('Enter the URL or ID of the Gist you would like to load.');
+      var str = _window.prompt('Enter the URL or ID of the Gist you would like to load.');
       if (str !== '') {
         gistId = getGistId(str);
         loadingFromGist = !!gistId;
@@ -21,16 +18,14 @@ function handleLoad (cb) {
     if (loadingFromGist) {
       cb(gistId);
     }
-  }
-  return loadingFromGist;
-}
+    return loadingFromGist;
+  };
 
-function getGistId (str) {
-  var idr = /[0-9A-Fa-f]{8,}/;
-  var match = idr.exec(str);
-  return match ? match[0] : null;
+  function getGistId (str) {
+    var idr = /[0-9A-Fa-f]{8,}/;
+    var match = idr.exec(str);
+    return match ? match[0] : null;
+  }
 }
 
-module.exports = {
-  handleLoad: handleLoad
-};
+module.exports = GistHandler;

test/gist-handler-test.js

+var test = require('tape');
+
+var GistHandler = require('../src/app/gist-handler');
+
+test('gistHandler.handleLoad with no gist param', function (t) {
+  t.plan(1);
+
+  var gistHandler = new GistHandler({});
+
+  var params = {};
+  var result = gistHandler.handleLoad(params, null);
+
+  t.equal(result, false);
+});
+
+test('gistHandler.handleLoad with blank gist param, and invalid user input', function (t) {
+  t.plan(3);
+
+  var fakeWindow = {prompt: function (message) {
+    t.ok(message);
+    t.ok(message.match(/gist/i));
+    return 'invalid';
+  }};
+
+  var gistHandler = new GistHandler(fakeWindow);
+
+  var params = {'gist': ''};
+  var result = gistHandler.handleLoad(params, null);
+
+  t.equal(result, false);
+});
+
+test('gistHandler.handleLoad with blank gist param, and valid user input', function (t) {
+  t.plan(4);
+
+  var fakeWindow = {prompt: function (message) {
+    t.ok(message);
+    t.ok(message.match(/gist/i));
+    return 'Beef1234';
+  }};
+
+  var cb = function (gistId) {
+    t.equal(gistId, 'Beef1234');
+  };
+
+  var gistHandler = new GistHandler(fakeWindow);
+
+  var params = {'gist': ''};
+  var result = gistHandler.handleLoad(params, cb);
+
+  t.equal(result, true);
+});
+
+test('gistHandler.handleLoad with gist param', function (t) {
+  t.plan(2);
+
+  var gistHandler = new GistHandler({});
+
+  var params = {'gist': 'abc'};
+
+  var cb = function (gistId) {
+    t.equal(gistId, 'abc');
+  };
+
+  var result = gistHandler.handleLoad(params, cb);
+
+  t.equal(result, true);
+});
+

test/index.js

+require('./gist-handler-test');
 require('./query-params-test');