1 files changed, 8 insertions, 1 deletions
diff --git a/spec/ruby/core/io/pread_spec.rb b/spec/ruby/core/io/pread_spec.rb
index 28afc80e5c..6d93b432c2 100644
--- a/spec/ruby/core/io/pread_spec.rb
+++ b/spec/ruby/core/io/pread_spec.rb
@@ -22,7 +22,7 @@ guard -> { platform_is_not :windows or ruby_version_is "3.3" } do
 
     it "accepts a length, an offset, and an output buffer" do
       buffer = +"foo"
-      @file.pread(3, 4, buffer)
+      @file.pread(3, 4, buffer).should.equal?(buffer)
       buffer.should == "567"
     end
 
@@ -38,6 +38,13 @@ guard -> { platform_is_not :windows or ruby_version_is "3.3" } do
       buffer.should == "12345"
     end
 
+    it "preserves the encoding of the given buffer" do
+      buffer = ''.encode(Encoding::ISO_8859_1)
+      @file.pread(10, 0, buffer)
+
+      buffer.encoding.should == Encoding::ISO_8859_1
+    end
+
     it "does not advance the file pointer" do
       @file.pread(4, 0).should == "1234"
       @file.read.should == "1234567890"