Fix missing handling of offset argument in `IO::Buffer` `pread` and `pwrite`. (#7012)

1 files changed, 29 insertions, 0 deletions

diff --git a/test/ruby/test_io_buffer.rb b/test/ruby/test_io_buffer.rb
index 70070e93c9..d9fa22fd2a 100644
--- a/test/ruby/test_io_buffer.rb
+++ b/test/ruby/test_io_buffer.rb
@@ -373,6 +373,20 @@ class TestIOBuffer < Test::Unit::TestCase
     io.close!
   end
 
+  def test_pread_offset
+    io = Tempfile.new
+    io.write("Hello World")
+    io.seek(0)
+
+    buffer = IO::Buffer.new(128)
+    buffer.pread(io, 6, 5, 6)
+
+    assert_equal "World", buffer.get_string(6, 5)
+    assert_equal 0, io.tell
+  ensure
+    io.close!
+  end
+
   def test_pwrite
     io = Tempfile.new
 
@@ -388,6 +402,21 @@ class TestIOBuffer < Test::Unit::TestCase
     io.close!
   end
 
+  def test_pwrite_offset
+    io = Tempfile.new
+
+    buffer = IO::Buffer.new(128)
+    buffer.set_string("Hello World")
+    buffer.pwrite(io, 6, 5, 6)
+
+    assert_equal 0, io.tell
+
+    io.seek(6)
+    assert_equal "World", io.read(5)
+  ensure
+    io.close!
+  end
+
   def test_operators
     source = IO::Buffer.for("1234123412")
     mask = IO::Buffer.for("133\x00")