t/01_basic.t started to fail (with XML::LibXML 2.0129?)

[eserte]

My smoker systems started to report failures in the test suite:

# parsing chunk '<?xml v'
# parsing chunk 'ersion="1.0"?>'

#   Failed test 'event should be start_document'
#   at t/01_basic.t line 104.
#          got: 'set_document_locator'
#     expected: 'start_document'

#   Failed test 'event should be xml_decl'
#   at t/01_basic.t line 104.
#          got: 'start_document'
#     expected: 'xml_decl'

#   Failed test at t/01_basic.t line 105.
#     Structures begin differing at:
#          $got->{Version} = Does not exist
#     $expected->{Version} = '1.0'

#   Failed test 'event should be start_prefix_mapping'
#   at t/01_basic.t line 104.
#          got: 'xml_decl'
#     expected: 'start_prefix_mapping'

#   Failed test at t/01_basic.t line 105.
#     Structures begin differing at:
#          $got->{NamespaceURI} = Does not exist
#     $expected->{NamespaceURI} = 'http://foobar.com'
# parsing chunk '<foo xml'
# parsing chunk 'ns="http://foobar.com">'

#   Failed test 'event should be start_element'
#   at t/01_basic.t line 104.
#          got: 'start_prefix_mapping'
#     expected: 'start_element'

#   Failed test at t/01_basic.t line 105.
#     Structures begin differing at:
#          $got->{Attributes} = Does not exist
#     $expected->{Attributes} = HASH(0x1ea0f18)

#   Failed test at t/01_basic.t line 105.
#     Structures begin differing at:
#          $got->{Attributes}{{}x} = Does not exist
#     $expected->{Attributes}{{}x} = HASH(0x213e510)
# parsing chunk '<'
# parsing chunk 'bar x="1"'
# parsing chunk '>'

#   Failed test at t/01_basic.t line 105.
#     Structures begin differing at:
#          $got->{Name} = 'bar'
#     $expected->{Name} = 'baz'
# parsing chunk '<baz>whoopla</b'

#   Failed test 'event should be characters'
#   at t/01_basic.t line 104.
#          got: 'start_element'
#     expected: 'characters'

#   Failed test at t/01_basic.t line 105.
#     Structures begin differing at:
#          $got->{Name} = 'baz'
#     $expected->{Name} = Does not exist

#   Failed test 'event should be end_element'
#   at t/01_basic.t line 104.
#          got: 'characters'
#     expected: 'end_element'

#   Failed test at t/01_basic.t line 105.
#     Structures begin differing at:
#          $got->{Name} = Does not exist
#     $expected->{Name} = 'baz'
# parsing chunk 'az>'

#   Failed test at t/01_basic.t line 105.
#     Structures begin differing at:
#          $got->{LocalName} = 'baz'
#     $expected->{LocalName} = 'bar'
# parsing chunk '<'
# parsing chunk '/'
# parsing chunk 'bar>'

#   Failed test at t/01_basic.t line 105.
#     Structures begin differing at:
#          $got->{Name} = 'bar'
#     $expected->{Name} = 'foo'
# parsing chunk '</foo>'

#   Failed test 'event should be end_prefix_mapping'
#   at t/01_basic.t line 104.
#          got: 'end_element'
#     expected: 'end_prefix_mapping'

#   Failed test at t/01_basic.t line 105.
#     Structures begin differing at:
#          $got->{LocalName} = 'foo'
#     $expected->{LocalName} = Does not exist

#   Failed test 'event should be '
#   at t/01_basic.t line 104.
#          got: 'end_prefix_mapping'
#     expected: undef

#   Failed test at t/01_basic.t line 105.
#     Structures begin differing at:
#          $got->{Prefix} = ''
#     $expected->{Prefix} = Does not exist
# Looks like you planned 23 tests but ran 25.
# Looks like you failed 19 tests of 25 run.
t/01_basic.t .... 
Dubious, test returned 19 (wstat 4864, 0x1300)
Failed 17/23 subtests 

Statistical analysis suggests that the failures happen only with XML::LibXML 2.0129 (@shlomif: FYI):

****************************************************************
Regression 'mod:XML::LibXML'
****************************************************************
Name           	       Theta	      StdErr	 T-stat
[0='const']    	      1.0000	      0.0000	26624293896831908.00
[1='eq_2.0108']	      0.0000	      0.0000	   0.43
[2='eq_2.0113']	      0.0000	      0.0000	   0.57
[3='eq_2.0116']	      0.0000	      0.0000	   1.43
[4='eq_2.0117']	      0.0000	      0.0000	   0.62
[5='eq_2.0118']	      0.0000	      0.0000	   0.98
[6='eq_2.0121']	      0.0000	      0.0000	   1.01
[7='eq_2.0122']	      0.0000	      0.0000	   1.42
[8='eq_2.0123']	      0.0000	      0.0000	   1.28
[9='eq_2.0124']	      0.0000	      0.0000	   1.32
[10='eq_2.0125']	      0.0000	      0.0000	   1.14
[11='eq_2.0126']	      0.0000	      0.0000	   1.39
[12='eq_2.0127']	      0.0000	      0.0000	   0.85
[13='eq_2.0128']	      0.0000	      0.0000	   0.00
[14='eq_2.0129']	     -1.0000	      0.0000	-25324754955419304.00

R^2= 1.000, N= 211, K= 15

---

[eserte]

It looks like this is caused by this change: https://metacpan.org/changes/release/SHLOMIF/XML-LibXML-2.0129#L6

- Add support for the set_document_locator() SAX method .
   - Thanks to Alexander Batyrshin for the pull-request.