Fix remaining JRuby test and spec failures

[headius]

The JRuby extension has diverged too much and needs some updates to pass all tests and specs. I'll look into it but if anyone wants to help, go for it.

[kou]

Note: We have test failures/errors in CI but we ignore them for now. We want to fix them.

https://github.com/ruby/stringio/actions/runs/11715704881/job/32632536169#step:9:8

===============================================================================
Failure: test_coderange_after_overwrite(TestStringIO):
  <"\xD0\xB1\xD0\xBE\xD0\xB3\xD1\x83\xD1\x81">.ascii_only? is false value expected but was
  <true>
/home/runner/work/stringio/stringio/test/stringio/test_stringio.rb:1006:in `test_coderange_after_overwrite'
     1003:     s.rewind
     1004:     assert_predicate(s.string, :ascii_only?)
     1005:     s.write "\u{431 43e 433 443 441}"
  => 1006:     assert_not_predicate(s.string, :ascii_only?)
     1007: 
     1008:     s = StringIO.new("\u{3042}")
     1009:     s.rewind
org/jruby/RubyKernel.java:1426:in `catch'
org/jruby/RubyKernel.java:1421:in `catch'
org/jruby/RubyKernel.java:1426:in `catch'
org/jruby/RubyKernel.java:1421:in `catch'
===============================================================================
===============================================================================
Failure: test_each_byte_closed(TestStringIO): IOError expected but nothing was raised.
/home/runner/work/stringio/stringio/vendor/bundle/jruby/3.1.0/gems/test-unit-ruby-core-1.0.6/lib/core_assertions.rb:462:in `assert_raise'
/home/runner/work/stringio/stringio/test/stringio/test_stringio.rb:481:in `test_each_byte_closed'
     478:     f = StringIO.new("1234")
     479:     assert_equal("1".ord, f.each_byte {|c| f.close; break c })
     480:     f = StringIO.new("1234")
  => 481:     assert_raise(IOError) do
     482:       f.each_byte { f.close }
     483:     end
     484:   end
org/jruby/RubyKernel.java:1426:in `catch'
org/jruby/RubyKernel.java:1421:in `catch'
org/jruby/RubyKernel.java:1426:in `catch'
org/jruby/RubyKernel.java:1421:in `catch'
===============================================================================
===============================================================================
Failure: test_each_codepoint_closed(TestStringIO): IOError expected but nothing was raised.
/home/runner/work/stringio/stringio/vendor/bundle/jruby/3.1.0/gems/test-unit-ruby-core-1.0.6/lib/core_assertions.rb:462:in `assert_raise'
/home/runner/work/stringio/stringio/test/stringio/test_stringio.rb:578:in `test_each_codepoint_closed'
     575:     f = StringIO.new("1234")
     576:     assert_equal("1".ord, f.each_codepoint {|c| f.close; break c })
     577:     f = StringIO.new("1234")
  => 578:     assert_raise(IOError) do
     579:       f.each_codepoint { f.close }
     580:     end
     581:   end
org/jruby/RubyKernel.java:1426:in `catch'
org/jruby/RubyKernel.java:1421:in `catch'
org/jruby/RubyKernel.java:1426:in `catch'
org/jruby/RubyKernel.java:1421:in `catch'
===============================================================================
===============================================================================
Failure: test_each_codepoint_enumerator(TestStringIO)
/home/runner/work/stringio/stringio/test/stringio/test_stringio.rb:590:in `test_each_codepoint_enumerator'
     587:     russian_part = io.read(40).force_encoding('UTF-8')
     588: 
     589:     assert_equal("你好", chinese_part)
  => 590:     assert_equal("построить", russian_part)
     591:   end
     592: 
     593:   def test_gets2
org/jruby/RubyKernel.java:1426:in `catch'
org/jruby/RubyKernel.java:1421:in `catch'
org/jruby/RubyKernel.java:1426:in `catch'
org/jruby/RubyKernel.java:1421:in `catch'
<"построить"> expected but was
<"好построить">

diff:
? 好построить
===============================================================================
===============================================================================
Failure: test_encoding_read(TestStringIO)
/home/runner/work/stringio/stringio/test/stringio/test_stringio.rb:970:in `test_encoding_read'
     967: 
     968:   def test_encoding_read
     969:     s = StringIO.new("abc".encode("utf-32be"), "r:utf-8")
  => 970:     assert_equal("\0\0\0a\0\0\0b\0\0\0c", s.read)
     971:   end
     972: 
     973:   %w/UTF-8 UTF-16BE UTF-16LE UTF-32BE UTF-32LE/.each do |name|
org/jruby/RubyKernel.java:1426:in `catch'
org/jruby/RubyKernel.java:1421:in `catch'
org/jruby/RubyKernel.java:1426:in `catch'
org/jruby/RubyKernel.java:1421:in `catch'
<"\u0000\u0000\u0000a\u0000\u0000\u0000b\u0000\u0000\u0000c">(UTF-8) expected but was
<"abc">(UTF-32BE)

diff:
  ���a���b���c

? Encoding: UTF-8   
?               32BE
?               ?
===============================================================================
===============================================================================
Failure: test_encoding_write(TestStringIO)
/home/runner/work/stringio/stringio/test/stringio/test_stringio.rb:965:in `test_encoding_write'
     962:   def test_encoding_write
     963:     s = StringIO.new("", "w:utf-32be")
     964:     s.print "abc"
  => 965:     assert_equal("abc".encode("utf-32be"), s.string)
     966:   end
     967: 
     968:   def test_encoding_read
org/jruby/RubyKernel.java:1426:in `catch'
org/jruby/RubyKernel.java:1421:in `catch'
org/jruby/RubyKernel.java:1426:in `catch'
org/jruby/RubyKernel.java:1421:in `catch'
<"abc">(UTF-32BE) expected but was
<"abc">(UTF-8)

diff:
? ���a���b���c

? Encoding: UTF-32BE
?               8   
?               ????   
===============================================================================
===============================================================================
Error: test_initialize(TestStringIO): TypeError: no implicit conversion of nil into String
org/jruby/ext/stringio/StringIO.java:275:in `initialize'
org/jruby/RubyClass.java:922:in `new'
org/jruby/ext/stringio/StringIO.java:170:in `new'
/home/runner/work/stringio/stringio/test/stringio/test_stringio.rb:25:in `test_initialize'
     22:     assert_kind_of StringIO, StringIO.new
     23:     assert_kind_of StringIO, StringIO.new('str')
     24:     assert_kind_of StringIO, StringIO.new('str', 'r+')
  => 25:     assert_kind_of StringIO, StringIO.new(nil)
     26:     assert_raise(ArgumentError) { StringIO.new('', 'x') }
     27:     assert_raise(ArgumentError) { StringIO.new('', 'rx') }
     28:     assert_raise(ArgumentError) { StringIO.new('', 'rbt') }
org/jruby/RubyKernel.java:1426:in `catch'
org/jruby/RubyKernel.java:1421:in `catch'
org/jruby/RubyKernel.java:1426:in `catch'
org/jruby/RubyKernel.java:1421:in `catch'
===============================================================================
===============================================================================
Error: test_null(TestStringIO): TypeError: no implicit conversion of nil into String
org/jruby/ext/stringio/StringIO.java:275:in `initialize'
org/jruby/RubyClass.java:922:in `new'
org/jruby/ext/stringio/StringIO.java:170:in `new'
/home/runner/work/stringio/stringio/test/stringio/test_stringio.rb:45:in `test_null'
     42:   end
     43: 
     44:   def test_null
  => 45:     io = StringIO.new(nil)
     46:     assert_nil io.gets
     47:     io.puts "abc"
     48:     assert_nil io.string
org/jruby/RubyKernel.java:1426:in `catch'
org/jruby/RubyKernel.java:1421:in `catch'
org/jruby/RubyKernel.java:1426:in `catch'
org/jruby/RubyKernel.java:1421:in `catch'
===============================================================================
===============================================================================
Error: test_pread(TestStringIO): EOFError: End of file reached
org/jruby/ext/stringio/StringIO.java:1110:in `pread'
/home/runner/work/stringio/stringio/test/stringio/test_stringio.rb:782:in `test_pread'
     779:     assert_raise(ArgumentError) { f.pread(-1, 0) }
     780:     assert_raise(Errno::EINVAL) { f.pread(3, -1) }
     781: 
  => 782:     assert_equal "".b, StringIO.new("").pread(0, 0)
     783:     assert_equal "".b, StringIO.new("").pread(0, -10)
     784: 
     785:     buf = "stale".b
org/jruby/RubyKernel.java:1426:in `catch'
org/jruby/RubyKernel.java:1421:in `catch'
org/jruby/RubyKernel.java:1426:in `catch'
org/jruby/RubyKernel.java:1421:in `catch'
===============================================================================
===============================================================================
Failure: test_read(TestStringIO)
/home/runner/work/stringio/stringio/test/stringio/test_stringio.rb:709:in `test_read'
     706:     s = ""
     707:     assert_equal(Encoding::UTF_8, s.encoding, bug20418)
     708:     f.read(4, s)
  => 709:     assert_equal(Encoding::UTF_8, s.encoding, bug20418)
     710: 
     711:     f.rewind
     712:     s = ""
org/jruby/RubyKernel.java:1426:in `catch'
org/jruby/RubyKernel.java:1421:in `catch'
org/jruby/RubyKernel.java:1426:in `catch'
org/jruby/RubyKernel.java:1421:in `catch'
[Bug #20418] ™€®
<#<Encoding:UTF-8>> expected but was
<#<Encoding:ASCII-8BIT>>

diff:
? #<Encoding:UTF  -8   >
?            ASCII  BIT 
?            ???  +++ 
===============================================================================
===============================================================================
Error: test_set_encoding(TestStringIO): ArgumentError: unknown encoding name - ISO-8859-16:ISO-8859-1
org/jruby/ext/stringio/StringIO.java:1630:in `set_encoding'
/home/runner/work/stringio/stringio/test/stringio/test_stringio.rb:283:in `test_set_encoding'
     280:     assert_equal("foo\x83".b, f.gets)
     281: 
     282:     f = StringIO.new()
  => 283:     f.set_encoding("ISO-8859-16:ISO-8859-1")
     284:     assert_equal(Encoding::ISO_8859_16, f.external_encoding)
     285:     assert_equal(Encoding::ISO_8859_16, f.string.encoding)
     286:     assert_nil(f.internal_encoding)
org/jruby/RubyKernel.java:1426:in `catch'
org/jruby/RubyKernel.java:1421:in `catch'
org/jruby/RubyKernel.java:1426:in `catch'
org/jruby/RubyKernel.java:1421:in `catch'
===============================================================================
===============================================================================
Failure: test_strip_bom:UTF-16BE(TestStringIO)
/home/runner/work/stringio/stringio/test/stringio/test_stringio.rb:978:in `block in TestStringIO'
org/jruby/RubyKernel.java:1426:in `catch'
org/jruby/RubyKernel.java:1421:in `catch'
org/jruby/RubyKernel.java:1426:in `catch'
org/jruby/RubyKernel.java:1421:in `catch'
UTF-16BE
<#<Encoding:UTF-16BE>> expected but was
<#<Encoding:UTF-8>>

diff:
? #<Encoding:UTF-16BE>
?                8    
?                ????    
===============================================================================
===============================================================================
Failure: test_strip_bom:UTF-16LE(TestStringIO)
/home/runner/work/stringio/stringio/test/stringio/test_stringio.rb:978:in `block in TestStringIO'
org/jruby/RubyKernel.java:1426:in `catch'
org/jruby/RubyKernel.java:1421:in `catch'
org/jruby/RubyKernel.java:1426:in `catch'
org/jruby/RubyKernel.java:1421:in `catch'
UTF-16LE
<#<Encoding:UTF-16LE>> expected but was
<#<Encoding:UTF-8>>

diff:
? #<Encoding:UTF-16LE>
?                8    
?                ????    
===============================================================================
===============================================================================
Failure: test_strip_bom:UTF-32BE(TestStringIO)
/home/runner/work/stringio/stringio/test/stringio/test_stringio.rb:978:in `block in TestStringIO'
org/jruby/RubyKernel.java:1426:in `catch'
org/jruby/RubyKernel.java:1421:in `catch'
org/jruby/RubyKernel.java:1426:in `catch'
org/jruby/RubyKernel.java:1421:in `catch'
UTF-32BE
<#<Encoding:UTF-32BE>> expected but was
<#<Encoding:UTF-8>>

diff:
? #<Encoding:UTF-32BE>
?                8    
?                ????    
===============================================================================
===============================================================================
Failure: test_strip_bom:UTF-32LE(TestStringIO)
/home/runner/work/stringio/stringio/test/stringio/test_stringio.rb:978:in `block in TestStringIO'
org/jruby/RubyKernel.java:1426:in `catch'
org/jruby/RubyKernel.java:1421:in `catch'
org/jruby/RubyKernel.java:1426:in `catch'
org/jruby/RubyKernel.java:1421:in `catch'
UTF-32LE
<#<Encoding:UTF-32LE>> expected but was
<#<Encoding:UTF-8>>

diff:
? #<Encoding:UTF-32LE>
?                8    
?                ????    
===============================================================================
===============================================================================
Failure: test_strip_bom:UTF-8(TestStringIO)
/home/runner/work/stringio/stringio/test/stringio/test_stringio.rb:979:in `block in TestStringIO'
org/jruby/RubyKernel.java:1426:in `catch'
org/jruby/RubyKernel.java:1421:in `catch'
org/jruby/RubyKernel.java:1426:in `catch'
org/jruby/RubyKernel.java:1421:in `catch'
UTF-8
<"\xC4\x80a"> expected but was
<"\xEF\xBB\xBF\xC4\x80a">

diff:
? Āa
===============================================================================
===============================================================================
Failure: test_truncate(TestStringIO)
/home/runner/work/stringio/stringio/test/stringio/test_stringio.rb:58:in `test_truncate'
     55:     io.puts "def"
     56:     assert_equal("\0\0\0\0def\n", io.string, "[ruby-dev:24190]")
     57:     assert_raise(Errno::EINVAL) { io.truncate(-1) }
  => 58:     assert_equal(0, io.truncate(10))
     59:     assert_equal("\0\0\0\0def\n\0\0", io.string)
     60:   end
     61: 
org/jruby/RubyKernel.java:1426:in `catch'
org/jruby/RubyKernel.java:1421:in `catch'
org/jruby/RubyKernel.java:1426:in `catch'
org/jruby/RubyKernel.java:1421:in `catch'
<0> expected but was
<10>

diff:
? 10
===============================================================================
===============================================================================
Failure: test_ungetbyte_fill(TestStringIO)
/home/runner/work/stringio/stringio/test/stringio/test_stringio.rb:886:in `test_ungetbyte_fill'
     883:     s = StringIO.new
     884:     s.print 'a' * count
     885:     s.ungetbyte('b' * (count * 5))
  => 886:     assert_equal((count * 5), s.string.size)
     887:     assert_match(/\Ab+\z/, s.string)
     888:   end
     889: 
org/jruby/RubyKernel.java:1426:in `catch'
org/jruby/RubyKernel.java:1421:in `catch'
org/jruby/RubyKernel.java:1426:in `catch'
org/jruby/RubyKernel.java:1421:in `catch'
<500> expected but was
<900>

diff:
? 500
? 9  
? ?  
===============================================================================
===============================================================================
Failure: test_ungetc_fill(TestStringIO)
/home/runner/work/stringio/stringio/test/stringio/test_stringio.rb:841:in `test_ungetc_fill'
     838:     s = StringIO.new
     839:     s.print 'a' * count
     840:     s.ungetc('b' * (count * 5))
  => 841:     assert_equal((count * 5), s.string.size)
     842:     assert_match(/\Ab+\z/, s.string)
     843:   end
     844: 
org/jruby/RubyKernel.java:1426:in `catch'
org/jruby/RubyKernel.java:1421:in `catch'
org/jruby/RubyKernel.java:1426:in `catch'
org/jruby/RubyKernel.java:1421:in `catch'
<500> expected but was
<900>

diff:
? 500
? 9  
? ?  
===============================================================================
===============================================================================
Failure: test_write_encoding_conversion(TestStringIO):

  1. [1/4] Assertion for "\"🍣\""
     | Encoding::CompatibilityError expected but nothing was raised.

  2. [2/4] Assertion for "\"あ🍣\""
     | Encoding::CompatibilityError expected but nothing was raised.

  3. [3/4] Assertion for "[\"あ\", \"🍣\"]"
     | [Encoding::CompatibilityError] exception expected, not #<Java::JavaLang::RuntimeException: org.jruby.exceptions.EncodingError$CompatibilityError: (CompatibilityError) incompatible encodings: Windows-31J and UTF-8>.

  4. [4/4] Assertion for "[\"a\", \"🍣\"]"
     | Encoding::CompatibilityError expected but nothing was raised.
  <false> is not true.
/home/runner/work/stringio/stringio/vendor/bundle/jruby/3.1.0/gems/test-unit-ruby-core-1.0.6/lib/core_assertions.rb:540:in `assert'
/home/runner/work/stringio/stringio/vendor/bundle/jruby/3.1.0/gems/test-unit-ruby-core-1.0.6/lib/core_assertions.rb:774:in `assert_all_assertions'
/home/runner/work/stringio/stringio/test/stringio/test_stringio.rb:229:in `test_write_encoding_conversion'
     226:     s.write("foo".force_encoding("US-ASCII"), convertible)
     227:     assert_equal(Encoding::UTF_8, s.string.encoding)
     228: 
  => 229:     all_assertions do |a|
     230:       [
     231:         inconvertible,
     232:         convertible + inconvertible,
org/jruby/RubyKernel.java:1426:in `catch'
org/jruby/RubyKernel.java:1421:in `catch'
org/jruby/RubyKernel.java:1426:in `catch'
org/jruby/RubyKernel.java:1421:in `catch'
===============================================================================
===============================================================================
Failure: test_write_integer_overflow(TestStringIO): [ArgumentError] exception expected, not #<Java::JavaLang::ArrayIndexOutOfBoundsException: arraycopy: last destination index 2147483666 out of bounds for byte[0]>.
/home/runner/work/stringio/stringio/vendor/bundle/jruby/3.1.0/gems/test-unit-ruby-core-1.0.6/lib/core_assertions.rb:454:in `block in assert_raise'
/home/runner/work/stringio/stringio/vendor/bundle/jruby/3.1.0/gems/test-unit-ruby-core-1.0.6/lib/core_assertions.rb:540:in `assert'
/home/runner/work/stringio/stringio/vendor/bundle/jruby/3.1.0/gems/test-unit-ruby-core-1.0.6/lib/core_assertions.rb:453:in `assert_raise'
/home/runner/work/stringio/stringio/test/stringio/test_stringio.rb:249:in `test_write_integer_overflow'
     246:   def test_write_integer_overflow
     247:     f = StringIO.new
     248:     f.pos = StringIO::MAX_LENGTH
  => 249:     assert_raise(ArgumentError) {
     250:       f.write("pos + len overflows")
     251:     }
     252:   end
org/jruby/RubyKernel.java:1426:in `catch'
org/jruby/RubyKernel.java:1421:in `catch'
org/jruby/RubyKernel.java:1426:in `catch'
org/jruby/RubyKernel.java:1421:in `catch'
===============================================================================
Finished in 0.833299 seconds.
93 tests, 565 assertions, 17 failures, 4 errors, 0 pendings, 1 omissions, 0 notifications
rake aborted!