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diff --git a/spec/rubyspec/core/string/unpack/j_spec.rb b/spec/rubyspec/core/string/unpack/j_spec.rb
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+++ b/spec/rubyspec/core/string/unpack/j_spec.rb
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+require File.expand_path('../../../../spec_helper', __FILE__)
+require File.expand_path('../../fixtures/classes', __FILE__)
+require File.expand_path('../shared/basic', __FILE__)
+require File.expand_path('../shared/integer', __FILE__)
+
+ruby_version_is '2.3' do
+ # To handle the special case of x64-mingw32
+ pointer_size = RUBY_PLATFORM =~ /\bx64\b/ ? 64 : 1.size * 8
+
+ if pointer_size == 64 then
+ little_endian do
+ describe "String#unpack with format 'J'" do
+ describe "with modifier '_'" do
+ it_behaves_like :string_unpack_64bit_le, 'J_'
+ it_behaves_like :string_unpack_64bit_le_unsigned, 'J_'
+ end
+
+ describe "with modifier '!'" do
+ it_behaves_like :string_unpack_64bit_le, 'J!'
+ it_behaves_like :string_unpack_64bit_le_unsigned, 'J!'
+ end
+ end
+
+ describe "String#unpack with format 'j'" do
+ describe "with modifier '_'" do
+ it_behaves_like :string_unpack_64bit_le, 'j_'
+ it_behaves_like :string_unpack_64bit_le_signed, 'j_'
+ end
+
+ describe "with modifier '!'" do
+ it_behaves_like :string_unpack_64bit_le, 'j!'
+ it_behaves_like :string_unpack_64bit_le_signed, 'j!'
+ end
+ end
+ end
+
+ big_endian do
+ describe "String#unpack with format 'J'" do
+ describe "with modifier '_'" do
+ it_behaves_like :string_unpack_64bit_be, 'J_'
+ it_behaves_like :string_unpack_64bit_be_unsigned, 'J_'
+ end
+
+ describe "with modifier '!'" do
+ it_behaves_like :string_unpack_64bit_be, 'J!'
+ it_behaves_like :string_unpack_64bit_be_unsigned, 'J!'
+ end
+ end
+
+ describe "String#unpack with format 'j'" do
+ describe "with modifier '_'" do
+ it_behaves_like :string_unpack_64bit_be, 'j_'
+ it_behaves_like :string_unpack_64bit_be_signed, 'j_'
+ end
+
+ describe "with modifier '!'" do
+ it_behaves_like :string_unpack_64bit_be, 'j!'
+ it_behaves_like :string_unpack_64bit_be_signed, 'j!'
+ end
+ end
+ end
+
+ describe "String#unpack with format 'J'" do
+ describe "with modifier '<'" do
+ it_behaves_like :string_unpack_64bit_le, 'J<'
+ it_behaves_like :string_unpack_64bit_le_unsigned, 'J<'
+ end
+
+ describe "with modifier '>'" do
+ it_behaves_like :string_unpack_64bit_be, 'J>'
+ it_behaves_like :string_unpack_64bit_be_unsigned, 'J>'
+ end
+
+ describe "with modifier '<' and '_'" do
+ it_behaves_like :string_unpack_64bit_le, 'J<_'
+ it_behaves_like :string_unpack_64bit_le, 'J_<'
+ it_behaves_like :string_unpack_64bit_le_unsigned, 'J<_'
+ it_behaves_like :string_unpack_64bit_le_unsigned, 'J_<'
+ end
+
+ describe "with modifier '<' and '!'" do
+ it_behaves_like :string_unpack_64bit_le, 'J<!'
+ it_behaves_like :string_unpack_64bit_le, 'J!<'
+ it_behaves_like :string_unpack_64bit_le_unsigned, 'J<!'
+ it_behaves_like :string_unpack_64bit_le_unsigned, 'J!<'
+ end
+
+ describe "with modifier '>' and '_'" do
+ it_behaves_like :string_unpack_64bit_be, 'J>_'
+ it_behaves_like :string_unpack_64bit_be, 'J_>'
+ it_behaves_like :string_unpack_64bit_be_unsigned, 'J>_'
+ it_behaves_like :string_unpack_64bit_be_unsigned, 'J_>'
+ end
+
+ describe "with modifier '>' and '!'" do
+ it_behaves_like :string_unpack_64bit_be, 'J>!'
+ it_behaves_like :string_unpack_64bit_be, 'J!>'
+ it_behaves_like :string_unpack_64bit_be_unsigned, 'J>!'
+ it_behaves_like :string_unpack_64bit_be_unsigned, 'J!>'
+ end
+ end
+
+ describe "String#unpack with format 'j'" do
+ describe "with modifier '<'" do
+ it_behaves_like :string_unpack_64bit_le, 'j<'
+ it_behaves_like :string_unpack_64bit_le_signed, 'j<'
+ end
+
+ describe "with modifier '>'" do
+ it_behaves_like :string_unpack_64bit_be, 'j>'
+ it_behaves_like :string_unpack_64bit_be_signed, 'j>'
+ end
+
+ describe "with modifier '<' and '_'" do
+ it_behaves_like :string_unpack_64bit_le, 'j<_'
+ it_behaves_like :string_unpack_64bit_le, 'j_<'
+ it_behaves_like :string_unpack_64bit_le_signed, 'j<_'
+ it_behaves_like :string_unpack_64bit_le_signed, 'j_<'
+ end
+
+ describe "with modifier '<' and '!'" do
+ it_behaves_like :string_unpack_64bit_le, 'j<!'
+ it_behaves_like :string_unpack_64bit_le, 'j!<'
+ it_behaves_like :string_unpack_64bit_le_signed, 'j<!'
+ it_behaves_like :string_unpack_64bit_le_signed, 'j!<'
+ end
+
+ describe "with modifier '>' and '_'" do
+ it_behaves_like :string_unpack_64bit_be, 'j>_'
+ it_behaves_like :string_unpack_64bit_be, 'j_>'
+ it_behaves_like :string_unpack_64bit_be_signed, 'j>_'
+ it_behaves_like :string_unpack_64bit_be_signed, 'j_>'
+ end
+
+ describe "with modifier '>' and '!'" do
+ it_behaves_like :string_unpack_64bit_be, 'j>!'
+ it_behaves_like :string_unpack_64bit_be, 'j!>'
+ it_behaves_like :string_unpack_64bit_be_signed, 'j>!'
+ it_behaves_like :string_unpack_64bit_be_signed, 'j!>'
+ end
+ end
+ end
+
+ if pointer_size == 32 then
+ little_endian do
+ describe "String#unpack with format 'J'" do
+ describe "with modifier '_'" do
+ it_behaves_like :string_unpack_32bit_le, 'J_'
+ it_behaves_like :string_unpack_32bit_le_unsigned, 'J_'
+ end
+
+ describe "with modifier '!'" do
+ it_behaves_like :string_unpack_32bit_le, 'J!'
+ it_behaves_like :string_unpack_32bit_le_unsigned, 'J!'
+ end
+ end
+
+ describe "String#unpack with format 'j'" do
+ describe "with modifier '_'" do
+ it_behaves_like :string_unpack_32bit_le, 'j_'
+ it_behaves_like :string_unpack_32bit_le_signed, 'j_'
+ end
+
+ describe "with modifier '!'" do
+ it_behaves_like :string_unpack_32bit_le, 'j!'
+ it_behaves_like :string_unpack_32bit_le_signed, 'j!'
+ end
+ end
+ end
+
+ big_endian do
+ describe "String#unpack with format 'J'" do
+ describe "with modifier '_'" do
+ it_behaves_like :string_unpack_32bit_be, 'J_'
+ it_behaves_like :string_unpack_32bit_be_unsigned, 'J_'
+ end
+
+ describe "with modifier '!'" do
+ it_behaves_like :string_unpack_32bit_be, 'J!'
+ it_behaves_like :string_unpack_32bit_be_unsigned, 'J!'
+ end
+ end
+
+ describe "String#unpack with format 'j'" do
+ describe "with modifier '_'" do
+ it_behaves_like :string_unpack_32bit_be, 'j_'
+ it_behaves_like :string_unpack_32bit_be_signed, 'j_'
+ end
+
+ describe "with modifier '!'" do
+ it_behaves_like :string_unpack_32bit_be, 'j!'
+ it_behaves_like :string_unpack_32bit_be_signed, 'j!'
+ end
+ end
+ end
+
+ describe "String#unpack with format 'J'" do
+ describe "with modifier '<'" do
+ it_behaves_like :string_unpack_32bit_le, 'J<'
+ it_behaves_like :string_unpack_32bit_le_unsigned, 'J<'
+ end
+
+ describe "with modifier '>'" do
+ it_behaves_like :string_unpack_32bit_be, 'J>'
+ it_behaves_like :string_unpack_32bit_be_unsigned, 'J>'
+ end
+
+ describe "with modifier '<' and '_'" do
+ it_behaves_like :string_unpack_32bit_le, 'J<_'
+ it_behaves_like :string_unpack_32bit_le, 'J_<'
+ it_behaves_like :string_unpack_32bit_le_unsigned, 'J<_'
+ it_behaves_like :string_unpack_32bit_le_unsigned, 'J_<'
+ end
+
+ describe "with modifier '<' and '!'" do
+ it_behaves_like :string_unpack_32bit_le, 'J<!'
+ it_behaves_like :string_unpack_32bit_le, 'J!<'
+ it_behaves_like :string_unpack_32bit_le_unsigned, 'J<!'
+ it_behaves_like :string_unpack_32bit_le_unsigned, 'J!<'
+ end
+
+ describe "with modifier '>' and '_'" do
+ it_behaves_like :string_unpack_32bit_be, 'J>_'
+ it_behaves_like :string_unpack_32bit_be, 'J_>'
+ it_behaves_like :string_unpack_32bit_be_unsigned, 'J>_'
+ it_behaves_like :string_unpack_32bit_be_unsigned, 'J_>'
+ end
+
+ describe "with modifier '>' and '!'" do
+ it_behaves_like :string_unpack_32bit_be, 'J>!'
+ it_behaves_like :string_unpack_32bit_be, 'J!>'
+ it_behaves_like :string_unpack_32bit_be_unsigned, 'J>!'
+ it_behaves_like :string_unpack_32bit_be_unsigned, 'J!>'
+ end
+ end
+
+ describe "String#unpack with format 'j'" do
+ describe "with modifier '<'" do
+ it_behaves_like :string_unpack_32bit_le, 'j<'
+ it_behaves_like :string_unpack_32bit_le_signed, 'j<'
+ end
+
+ describe "with modifier '>'" do
+ it_behaves_like :string_unpack_32bit_be, 'j>'
+ it_behaves_like :string_unpack_32bit_be_signed, 'j>'
+ end
+
+ describe "with modifier '<' and '_'" do
+ it_behaves_like :string_unpack_32bit_le, 'j<_'
+ it_behaves_like :string_unpack_32bit_le, 'j_<'
+ it_behaves_like :string_unpack_32bit_le_signed, 'j<_'
+ it_behaves_like :string_unpack_32bit_le_signed, 'j_<'
+ end
+
+ describe "with modifier '<' and '!'" do
+ it_behaves_like :string_unpack_32bit_le, 'j<!'
+ it_behaves_like :string_unpack_32bit_le, 'j!<'
+ it_behaves_like :string_unpack_32bit_le_signed, 'j<!'
+ it_behaves_like :string_unpack_32bit_le_signed, 'j!<'
+ end
+
+ describe "with modifier '>' and '_'" do
+ it_behaves_like :string_unpack_32bit_be, 'j>_'
+ it_behaves_like :string_unpack_32bit_be, 'j_>'
+ it_behaves_like :string_unpack_32bit_be_signed, 'j>_'
+ it_behaves_like :string_unpack_32bit_be_signed, 'j_>'
+ end
+
+ describe "with modifier '>' and '!'" do
+ it_behaves_like :string_unpack_32bit_be, 'j>!'
+ it_behaves_like :string_unpack_32bit_be, 'j!>'
+ it_behaves_like :string_unpack_32bit_be_signed, 'j>!'
+ it_behaves_like :string_unpack_32bit_be_signed, 'j!>'
+ end
+ end
+ end
+end