1 files changed, 44 insertions, 0 deletions
diff --git a/spec/ruby/core/string/chr_spec.rb b/spec/ruby/core/string/chr_spec.rb
new file mode 100644
index 0000000000..c7834b78b7
--- /dev/null
+++ b/spec/ruby/core/string/chr_spec.rb
@@ -0,0 +1,44 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+with_feature :encoding do
+  describe "String#chr" do
+    it "returns a copy of self" do
+      s = 'e'
+      s.object_id.should_not == s.chr.object_id
+    end
+
+    it "returns a String" do
+      'glark'.chr.should be_an_instance_of(String)
+    end
+
+    it "returns an empty String if self is an empty String" do
+      "".chr.should == ""
+    end
+
+    it "returns a 1-character String" do
+      "glark".chr.size.should == 1
+    end
+
+    it "returns the character at the start of the String" do
+      "Goodbye, world".chr.should == "G"
+    end
+
+    it "returns a String in the same encoding as self" do
+      "\x24".encode(Encoding::US_ASCII).chr.encoding.should == Encoding::US_ASCII
+    end
+
+    it "understands multi-byte characters" do
+      s = "\u{9879}"
+      s.bytesize.should == 3
+      s.chr.should == s
+    end
+
+    it "understands Strings that contain a mixture of character widths" do
+      three = "\u{8082}"
+      three.bytesize.should == 3
+      four = "\u{77082}"
+      four.bytesize.should == 4
+      "#{three}#{four}".chr.should == three
+    end
+  end
+end