[webkit-dev] PSA: consider using check-layout.js for layout patches

Wed Oct 10 15:49:04 PDT 2012

check-layout.js allows you to easily write dumpAsText tests for layout
patches that assert sizing and positioning information.

Usage:
1. checkLayout(selector); // checks layout of all elements matching the
selector.
2. Use data-expected-* for the asserts. See
http://trac.webkit.org/browser/trunk/LayoutTests/resources/check-layout.js for
the full list of supported expected values. Feel free to add more here as
appropriate. This is just what we've needed so far for flexbox.

Here's an example:
<!DOCTYPE html>
<script src="path/to/LayoutTests/resources/check-layout.js"></script>
<div style="width: 100px">
    <div class="box" style="width: 50%" data-expected-width=50></div>
    <div class="box" style="width: 20%" data-expected-width=20></div>
</div>
<script>
checkLayout(".box");
</script>

This will spit out a text expected result of:
PASS
PASS

When a test fails, it will spit out the expected "FAIL: got ... expected
..." lines as well as the outerHTML of the failing element.
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