Add in-tree mspec and ruby/spec

* For easier modifications of ruby/spec by MRI developers.
* .gitignore: track changes under spec.
* spec/mspec, spec/rubyspec: add in-tree mspec and ruby/spec.
  These files can therefore be updated like any other file in MRI.
  Instructions are provided in spec/README.
  [Feature #13156] [ruby-core:79246]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58595 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 31 insertions, 0 deletions

diff --git a/spec/rubyspec/core/encoding/undefined_conversion_error/source_encoding_spec.rb b/spec/rubyspec/core/encoding/undefined_conversion_error/source_encoding_spec.rb
new file mode 100644
index 0000000000..984862646c
--- /dev/null
+++ b/spec/rubyspec/core/encoding/undefined_conversion_error/source_encoding_spec.rb
@@ -0,0 +1,31 @@
+require File.expand_path('../../fixtures/classes', __FILE__)
+
+with_feature :encoding do
+  describe "Encoding::UndefinedConversionError#source_encoding" do
+    before :each do
+      @exception = EncodingSpecs::UndefinedConversionError.exception
+      @exception2 = EncodingSpecs::UndefinedConversionErrorIndirect.exception
+    end
+
+    it "returns an Encoding object" do
+      @exception.source_encoding.should be_an_instance_of(Encoding)
+      @exception2.source_encoding.should be_an_instance_of(Encoding)
+    end
+
+    it "is equal to the source encoding of the object that raised it" do
+      @exception.source_encoding.should == Encoding::UTF_8
+    end
+
+    # The source encoding specified in the Encoding::Converter constructor may
+    # differ from the source encoding returned here. What seems to happen is
+    # that when transcoding along a path with multiple pairs of encodings, the
+    # last one encountered when the error occurred is returned. So in this
+    # case, the conversion path is ISO-8859-1 -> UTF-8 -> EUC-JP. The
+    # conversion from ISO-8859-1 -> UTF-8 succeeded, but the conversion from
+    # UTF-8 to EUC-JP failed. IOW, it failed when the source encoding was
+    # UTF-8, so UTF-8 is regarded as the source encoding.
+    it "is equal to the source encoding at the stage of the conversion path where the error occured" do
+      @exception2.source_encoding.should == Encoding::UTF_8
+    end
+  end
+end