auto_tests/tests/hidpi.js

   1 /**
   2  * @fileoverview Tests for window.devicePixelRatio > 1.
   3  *
   4  * @author danvdk@gmail.com (Dan Vanderkam)
   5  */
   6 var hidpiTestCase = TestCase("hidpi");
   7
   8 var savePixelRatio;
   9 hidpiTestCase.prototype.setUp = function() {
  10   savePixelRatio = window.devicePixelRatio;
  11   window.devicePixelRatio = 2;
  12
  13   document.body.innerHTML = "<div id='graph'></div>";
  14 };
  15
  16 hidpiTestCase.prototype.tearDown = function() {
  17   window.devicePixelRatio = savePixelRatio;
  18 };
  19
  20 hidpiTestCase.prototype.testNameGoesHere = function() {
  21   var graph = document.getElementById("graph");
  22   graph.style.width = "70%";  // more than half.
  23   graph.style.height = "200px";
  24
  25   var opts = {};
  26   var data = "X,Y\n" +
  27       "0,-1\n" +
  28       "1,0\n" +
  29       "2,1\n" +
  30       "3,0\n"
  31   ;
  32
  33   var g = new Dygraph(graph, data, opts);
  34
  35   // See http://stackoverflow.com/a/2146905/388951
  36   var hasHorizontalScrollbar = (document.body.scrollWidth > document.body.clientWidth);
  37   assertEquals(false, hasHorizontalScrollbar);
  38 };
  39