1 files changed, 5 insertions, 0 deletions
diff --git a/spec/ruby/core/encoding/converter/primitive_convert_spec.rb b/spec/ruby/core/encoding/converter/primitive_convert_spec.rb
index 802d8e7cb1..63f25eddef 100644
--- a/spec/ruby/core/encoding/converter/primitive_convert_spec.rb
+++ b/spec/ruby/core/encoding/converter/primitive_convert_spec.rb
@@ -1,4 +1,5 @@
 # -*- encoding: binary -*-
+# frozen_string_literal: false
 require_relative '../../../spec_helper'
 
 describe "Encoding::Converter#primitive_convert" do
@@ -14,6 +15,10 @@ describe "Encoding::Converter#primitive_convert" do
     -> { @ec.primitive_convert("","") }.should_not raise_error
   end
 
+  it "raises FrozenError when the destination buffer is a frozen String" do
+    -> { @ec.primitive_convert("", "".freeze) }.should raise_error(FrozenError)
+  end
+
   it "accepts nil for the destination byte offset" do
     -> { @ec.primitive_convert("","", nil) }.should_not raise_error
   end