From 71bf5cef75b9d244a06261c9fc0b84fbe5a1592f Mon Sep 17 00:00:00 2001
From: Samuel Williams <samuel.williams@oriontransfer.co.nz>
Date: Mon, 20 Dec 2021 09:43:22 +1300
Subject: Fix handling of frozens strings.

---
 test/ruby/test_io_buffer.rb | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'test/ruby/test_io_buffer.rb')

diff --git a/test/ruby/test_io_buffer.rb b/test/ruby/test_io_buffer.rb
index 385a133421..76fa1bd774 100644
--- a/test/ruby/test_io_buffer.rb
+++ b/test/ruby/test_io_buffer.rb
@@ -83,6 +83,7 @@ class TestIOBuffer < Test::Unit::TestCase
   def test_string_mapped
     string = "Hello World"
     buffer = IO::Buffer.for(string)
+    refute buffer.immutable?
 
     # Cannot modify string as it's locked by the buffer:
     assert_raise RuntimeError do
@@ -99,6 +100,13 @@ class TestIOBuffer < Test::Unit::TestCase
     assert_equal "Hello World", string
   end
 
+  def test_string_mapped_frozen
+    string = "Hello World".freeze
+    buffer = IO::Buffer.for(string)
+
+    assert buffer.immutable?
+  end
+
   def test_non_string
     not_string = Object.new
 
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