1 files changed, 42 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..26c7d51202
--- /dev/null
+++ b/spec/ruby/core/string/chr_spec.rb
@@ -0,0 +1,42 @@
+require_relative '../../spec_helper'
+
+describe "String#chr" do
+  it "returns a copy of self" do
+    s = 'e'
+    s.should_not.equal? s.chr
+  end
+
+  it "returns a String" do
+    'glark'.chr.should.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