| Version 3 (modified by , 14 years ago) ( diff ) |
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Writing Reftests
Reftests is not supported yet in WebKit. Please see https://bugs.webkit.org/show_bug.cgi?id=36065 for the current status.
Reftests in WebKit
Reftests use a HTML file ('-expected.html') to represent an expected rendering result, instead of pre-generated expected files, such as '-expected.txt', '-expected.checksum' and '-expected.png'.
Let's see the following sample reftest.
- hello.html
<html><head><title>reftest0001</title> <body><strong>Hello!</strong></body> </html>
- hello-expected.html
<html><head><title>reftest0001</title> <body><b>Hello!</b></body> </html>
A new-run-webkit-tests recognizes this is a reftest and run the test as if this is a normal layout test. You can think that a '-expected.html' file is used to produce '-expected.checksum' and '-expected.png' on the fly. If there is a difference between the rendering results of two html files, the test fails.
Screenshot: Todo
There is yet another type of reftests, 'a mismatch reftest'.
Let's see the following sample 'mismatch' reftest.
- foo.html
<html><head><title>reftest0001</title> <body><strong>Hello!</strong></body> </html>
- foo-expected-mismatch.html
<html><head><title>reftest0001</title> <body>Hello!</body> </html>
In this case, the test fails if both produces the same results. The test passes if there is any differences between them.
Screenshot: Todo
Naming convention
- (normal) reftests: {testname}.html and {testname}-expected.html
- 'mismatch' reftests: {testname}.html and {testname}-expected-mismatch.html
FAQ
- Q. Can we use a platform-specific expected html file?
- A. Yes. Reftests try to obey the current layout test mechanism as possible as we can.
- Q. What happens if we 'rebase' for reftests?
- A. A 'Rebasing' doesn't make sense in reftests. A rebase line tool simply skips reftests.
- Q. If we have hello.html, hello-expected.html and hello-expected-mismatch.html filles, what happens? Does that run two reftests?
- A. No. That should be considerd a wrong configuration. Please don't use one test file for a (normal) reftest and a 'mismatch' reftest. Please choose the different test name for each test.
- Q. Can we use '-expected.html' and '-expected.{checksum,png}' at the same time for one test file?
- A. No.
- Q. What kind of failures reftests produce?
- A. If an image comparison failure happens in reftests, that is marked as a 'IMAGE' failure. If either of two html files crashes, it is considered as 'CRASH'. So does 'TIMEOUT'.
