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Add documentation of reftest analyzer to wpt README

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jgraham 2015-06-02 23:24:24 +01:00
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tests/wpt/README.md
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@ -134,3 +134,21 @@ The `mozilla` directory contains tests that cannot be upstreamed for some
reason (e.g. because they depend on Servo-specific APIs), as well as some
legacy tests that should be upstreamed at some point. When run they are
mounted on the server under `/_mozilla/`.
Analyzing reftest results
=========================
Reftest results can be analyzed from a raw log file. To generate this run
with the `--log-raw` option e.g.
./mach test-css --log-raw css.log
This file can then be fed into the
[reftest analyzer](http://hoppipolla.co.uk/410/reftest-analyser-structured.xhtml)
which will show all failing tests (not just those with unexpected results).
Note that this ingests logs in a different format to original version of the
tool written for gecko reftests.
The reftest analyzer allows pixel-level comparison of the test and reference
screenshots. Tests that both fail and have an unexpected result are marked
with a `!`.