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Bug 1151421 Part 2: Add test of fractional scroll position properties. r=smaug

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MozReview-Commit-ID: 4a8eQeJz7fV

--HG--
extra : rebase_source : 8074ec268965b6ccd53140e581d07b10233c13f1
This commit is contained in:
Brad Werth 2017-03-14 17:31:22 -07:00
parent 3b8561b408
commit b1269f11fa
3 changed files with 82 additions and 0 deletions
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19
docshell/test/file_bug1151421.html Normal file
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@ -0,0 +1,19 @@
<html>
<head>
<style>
body, html {
height: 100%;
}
.spacer {
height: 80%;
}
</style>
</head>
<body onload='(parent || opener).childLoad()'>
<div class="spacer"></div>
<div id="content">content</div>
<div class="spacer"></div>
</body>
</html>

2
docshell/test/mochitest.ini
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@ -33,6 +33,7 @@ support-files =
file_bug680257.html
file_bug703855.html
file_bug728939.html
file_bug1151421.html
file_pushState_after_document_open.html
historyframes.html
@ -86,6 +87,7 @@ support-files = file_bug668513.html
[test_bug797909.html]
[test_bug1045096.html]
[test_bug1121701.html]
[test_bug1151421.html]
[test_bug1186774.html]
[test_forceinheritprincipal_overrule_owner.html]
[test_framedhistoryframes.html]

61
docshell/test/test_bug1151421.html Normal file
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<!DOCTYPE HTML>
<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=1151421
-->
<head>
<title>Test for Bug 1151421</title>
<script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
</head>
<body>
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1151421">Mozilla Bug 1151421</a>
<script type="application/javascript">
/** Test for Bug 1151421 **/
SimpleTest.waitForExplicitFinish();
function childLoad() {
// Spin the event loop so we leave the onload handler.
SimpleTest.executeSoon(childLoad2);
}
function childLoad2() {
let cw = iframe.contentWindow;
let content = cw.document.getElementById("content");
// Create a function to calculate an invariant.
let topPlusOffset = function()
{
return Math.round(content.getBoundingClientRect().top + cw.pageYOffset);
}
let initialTPO = topPlusOffset();
// Scroll the iframe to various positions, and check the TPO.
// Scrolling down to the bottom will adjust the page offset by a fractional amount.
let positions = [-100, 0.17, 0, 1.5, 10.41, 1e6, 12.1];
// Run some tests with scrollTo() and ensure we have the same invariant after scrolling.
positions.forEach(function(pos) {
cw.scrollTo(0, pos);
is(topPlusOffset(), initialTPO, "Top plus offset should remain invariant across scrolling.");
});
positions.reverse().forEach(function(pos) {
cw.scrollTo(0, pos);
is(topPlusOffset(), initialTPO, "(reverse) Top plus offset should remain invariant across scrolling.");
});
SimpleTest.finish();
}
</script>
<!-- When the iframe loads, it calls childLoad(). -->
<br>
<iframe height='100px' id='iframe' src='file_bug1151421.html'></iframe>
</body>
</html>