Test EncodedSring#to_s for undefined conversion / invalid byte sequence

Author: bf4

spec/rspec/support/encoded_string_spec.rb

@@ -21,6 +21,47 @@ module RSpec::Support
         end
       end
 
+      describe '#to_s' do
+        if RUBY_VERSION == '1.9.2' && RSpec::Support::Ruby.mri?
+          it 'does nothing to an invalid byte sequence' do
+            source_encoding = Encoding.find('UTF8-MAC')
+            incompatible_encoding = Encoding.find('IBM737')
+            string = "\xEF hi I am not going to work".force_encoding(source_encoding)
+            resulting_string = build_encoded_string(string, incompatible_encoding)
+
+            expect(resulting_string.to_s).to eq("\xEF hi I am not going to work")
+          end
+
+          it 'does nothing to unconvertable characters' do
+            source_encoding = Encoding.find('UTF-16LE')
+            incompatible_encoding = Encoding.find('IBM737')
+            string = "\xEF hi I am not going to work".force_encoding(source_encoding)
+            resulting_string = build_encoded_string(string, incompatible_encoding)
+
+            expect(resulting_string.to_s).to eq("\xEF hi I am not going to work")
+          end
+        else
+
+          it 'replaces invalid byte sequences with either a ? or a unicode ?' do
+            source_encoding = Encoding.find('UTF8-MAC')
+            incompatible_encoding = Encoding.find('IBM737')
+            string = "\xEF hi I am not going to work".force_encoding(source_encoding)
+            resulting_string = build_encoded_string(string, incompatible_encoding)
+
+            expect(resulting_string.to_s).to eq("? hi I am not going to work")
+          end
+
+          it 'replaces all characters with either a ? or a unicode ?' do
+            source_encoding = Encoding.find('UTF-16LE')
+            incompatible_encoding = Encoding.find('IBM737')
+            string = "\xEF hi I am not going to work".force_encoding(source_encoding)
+            resulting_string = build_encoded_string(string, incompatible_encoding)
+
+            expect(resulting_string.to_s).to eq("??????????????")
+          end
+        end
+      end
+
       let(:ascii_arrow_symbol) { "\xAE" }
 
       let(:utf_8_euro_symbol) { "\xE2\x82\xAC" }