[Webkit-unassigned] [Bug 33372] New: REGRESSION(r52976): platform/mac/editing/input/devanagari-ligature.html is failing on Snow Leopard Release

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=33372

           Summary: REGRESSION(r52976):
                    platform/mac/editing/input/devanagari-ligature.html is
                    failing on Snow Leopard Release
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Mac OS X 10.5
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: eric at webkit.org
                CC: ossy at webkit.org
        Depends on: 32294


REGRESSION(r52976): platform/mac/editing/input/devanagari-ligature.html is
failing on Snow Leopard Release

---
layout-test-results/platform/mac/editing/input/devanagari-ligature-expected.txt
   2010-01-08 00:05:31.000000000 -0800
+++
layout-test-results/platform/mac/editing/input/devanagari-ligature-actual.txt  
 2010-01-08 00:05:31.000000000 -0800
@@ -4,6 +4,6 @@
   RenderBlock {HTML} at (0,0) size 800x600
     RenderBody {BODY} at (8,8) size 784x584
       RenderBlock {DIV} at (0,0) size 784x19
-        RenderText {#text} at (0,1) size 11x18
-          text run at (0,1) width 11: "\x{915}\x{94D}\x{937}"
+        RenderText {#text} at (0,1) size 21x18
+          text run at (0,1) width 21: "\x{915}\x{94D}\x{937}"
 caret: position 3 of child 0 {#text} of child 1 {DIV} of child 1 {BODY} of
child 0 {HTML} of document

I expect this is the same kind of bug as bug 32294.

Unfortunately I do not have a Snow Leopard box, so I can't reproduce this. 
Someone else will have to find out what test was affecting
platform/mac/editing/input/devanagari-ligature.html.

To do so, I recommend:

1.  Confirm that running platform/mac/editing/input/devanagari-ligature.html by
itself "fails" (in this case, it was previously being affected by an http or
websocket test and we didn't notice)

in this case, the currently checked in result is incorrect, and we need to
figure out which test before devanagari-ligature.html is affecting it to cause
this failure.

2.  Assuming it failed when run alone, check out r52975.

Figure out what 1000 tests are run prior to devanagari-ligature.html.  To do
that:

3.  run-webkit-tests -v
4.  Select all tests output lines prior to and including
platform/mac/editing/input/devanagari-ligature.html
5.  pbpaste | awk '{ print $2 }' | tail -n 1000  > failing_set.txt  will write
the 1000 tests prior to (and including
platform/mac/editing/input/devanagari-ligature.html)
6.  cat failing_set.txt | xargs run-webkit-tests   and confirm that those tests
still "pass"

Now to find out which test or tests is affecting devanagari-ligature.html, do:

7. Remove some tests from failing_set.txt
8.  re-run cat failing_set.txt | xargs run-webkit-tests
9. if run-webkit-tests exits non-zero ("fails") then we've removed too many, go
back to step 7 remove different tests, otherwise remove more tests until you
can't remove any more.

Tada!

At least that's the methodology I used to figure out bug 32294, which again, I
believe to be a similar cause.

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