1 files changed, 31 insertions, 0 deletions
diff --git a/test/ruby/test_io.rb b/test/ruby/test_io.rb
index c19b1608df..d10926d2c9 100644
--- a/test/ruby/test_io.rb
+++ b/test/ruby/test_io.rb
@@ -2655,4 +2655,35 @@ End
       IO.select(tempfiles)
   }, bug8080
   end
+
+  def test_read_32bit_boundary
+    bug8431 = '[ruby-core:55098] [Bug #8431]'
+    make_tempfile {|t|
+      assert_separately(["-", bug8431, t.path], <<-"end;")
+        msg = ARGV.shift
+        f = open(ARGV[0], "rb")
+        f.seek(0xffff_ffff)
+        assert_nil(f.read(1), msg)
+      end;
+    }
+  end if /mswin|mingw/ =~ RUBY_PLATFORM
+
+  def test_write_32bit_boundary
+    bug8431 = '[ruby-core:55098] [Bug #8431]'
+    make_tempfile {|t|
+      assert_separately(["-", bug8431, t.path], <<-"end;", timeout: 30)
+        msg = ARGV.shift
+        f = open(ARGV[0], "wb")
+        f.seek(0xffff_ffff)
+        begin
+          # this will consume very long time or fail by ENOSPC on a
+          # filesystem which sparse file is not supported
+          f.write('1')
+        rescue SystemCallError
+        else
+          assert_equal(0x1_0000_0000, f.tell, msg)
+        end
+      end;
+    }
+  end if /mswin|mingw/ =~ RUBY_PLATFORM
 end