1 files changed, 56 insertions, 0 deletions
diff --git a/spec/ruby/core/encoding/converter/putback_spec.rb b/spec/ruby/core/encoding/converter/putback_spec.rb
new file mode 100644
index 0000000000..a85cec5145
--- /dev/null
+++ b/spec/ruby/core/encoding/converter/putback_spec.rb
@@ -0,0 +1,56 @@
+# encoding: binary
+require_relative '../../../spec_helper'
+
+describe "Encoding::Converter#putback" do
+  before :each do
+    @ec = Encoding::Converter.new("EUC-JP", "ISO-8859-1")
+    @ret = @ec.primitive_convert(@src=+"abc\xa1def", @dst=+"", nil, 10)
+  end
+
+  it "returns a String" do
+    @ec.putback.should.instance_of?(String)
+  end
+
+  it "returns a String in the source encoding" do
+    @ec.putback.encoding.should == Encoding::EUC_JP
+  end
+
+  it "returns the bytes buffered due to an :invalid_byte_sequence error" do
+    @ret.should == :invalid_byte_sequence
+    @ec.putback.should == 'd'
+    @ec.primitive_errinfo.last.should == 'd'
+  end
+
+  it "allows conversion to be resumed after an :invalid_byte_sequence" do
+    @src = @ec.putback + @src
+    @ret = @ec.primitive_convert(@src, @dst, nil, 10)
+    @ret.should == :finished
+    @dst.should == "abcdef"
+    @src.should == ""
+  end
+
+  it "returns an empty String when there are no more bytes to put back" do
+    @ec.putback
+    @ec.putback.should == ""
+  end
+
+  it "returns the problematic bytes for UTF-16LE" do
+    ec = Encoding::Converter.new("utf-16le", "iso-8859-1")
+    src = +"\x00\xd8\x61\x00"
+    dst = +""
+    ec.primitive_convert(src, dst).should == :invalid_byte_sequence
+    ec.primitive_errinfo.should == [:invalid_byte_sequence, "UTF-16LE", "UTF-8", "\x00\xD8", "a\x00"]
+    ec.putback.should == "a\x00".dup.force_encoding("utf-16le")
+    ec.putback.should == ""
+  end
+
+  it "accepts an integer argument corresponding to the number of bytes to be put back" do
+    ec = Encoding::Converter.new("utf-16le", "iso-8859-1")
+    src = +"\x00\xd8\x61\x00"
+    dst = +""
+    ec.primitive_convert(src, dst).should == :invalid_byte_sequence
+    ec.primitive_errinfo.should == [:invalid_byte_sequence, "UTF-16LE", "UTF-8", "\x00\xD8", "a\x00"]
+    ec.putback(2).should == "a\x00".dup.force_encoding("utf-16le")
+    ec.putback.should == ""
+  end
+end