third_party/WebKit/LayoutTests/fast/scroll-behavior/scroll-customization/scrollstate-consume-deltas-throw.html

   1 <!DOCTYPE html>
   2 <html>
   3 <head>
   4 <title>ScrollState's consumeDelta method throws on invalid deltas</title>
   5 <script src="../../../resources/testharness.js"></script>
   6 <script src="../../../resources/testharnessreport.js"></script>
   7 </head>
   8 <body>
   9 <script>
  10
  11 test(function() {
  12   assert_true('ScrollState' in window, "'ScrollState' in window");
  13 }, "These tests only work with scroll customization enabled.");
  14
  15 function testConsumingDelta(dx, dy, consume_x, consume_y, testName, expectedError) {
  16   test(function() {
  17     var scrollState = new ScrollState(dx, dy);
  18     assert_throws('InvalidModificationError', function() {
  19       scrollState.consumeDelta(consume_x, consume_y);
  20     });
  21     assert_equals(scrollState.deltaX, dx);
  22     assert_equals(scrollState.deltaY, dy);
  23   }, testName);
  24 }
  25
  26 if ('ScrollState' in window) {
  27   // Consume from an event with a delta of (5, 5).
  28   testConsumingDelta(5, 5, 6, 4, "Overconsumed X");
  29   testConsumingDelta(5, 5, 4, 6, "Overconsumed Y");
  30   testConsumingDelta(5, 5, -1, 4, "Can't increase X delta");
  31   testConsumingDelta(5, 5, 4, -1, "Can't increase Y delta");
  32
  33   // Consume from an event with a delta of (-5, -5).
  34   testConsumingDelta(-5, -5, -6, -4, "Overconsumed X with negative delta");
  35   testConsumingDelta(-5, -5, -4, -6, "Overconsumed Y with negative delta");
  36   testConsumingDelta(-5, -5, 1, -4, "Can't increase X delta magnitude");
  37   testConsumingDelta(-5, -5, -4, 1, "Can't increase Y delta magnitude");
  38 }
  39 </script>
  40 </body>
  41 </html>