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diff --git a/spec/ruby/core/symbol/casecmp_spec.rb b/spec/ruby/core/symbol/casecmp_spec.rb
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+++ b/spec/ruby/core/symbol/casecmp_spec.rb
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+# -*- encoding: utf-8 -*-
+require_relative '../../spec_helper'
+
+describe "Symbol#casecmp with Symbol" do
+  it "compares symbols without regard to case" do
+    :abcdef.casecmp(:abcde).should == 1
+    :aBcDeF.casecmp(:abcdef).should == 0
+    :abcdef.casecmp(:abcdefg).should == -1
+    :abcdef.casecmp(:ABCDEF).should == 0
+  end
+
+  it "doesn't consider non-ascii characters equal that aren't" do
+    # -- Latin-1 --
+    upper_a_tilde  = "\xC3".b.to_sym
+    upper_a_umlaut = "\xC4".b.to_sym
+    lower_a_tilde  = "\xE3".b.to_sym
+    lower_a_umlaut = "\xE4".b.to_sym
+
+    lower_a_tilde.casecmp(lower_a_umlaut).should_not == 0
+    lower_a_umlaut.casecmp(lower_a_tilde).should_not == 0
+    upper_a_tilde.casecmp(upper_a_umlaut).should_not == 0
+    upper_a_umlaut.casecmp(upper_a_tilde).should_not == 0
+
+    # -- UTF-8 --
+    upper_a_tilde  = :"Ã"
+    lower_a_tilde  = :"ã"
+    upper_a_umlaut = :"Ä"
+    lower_a_umlaut = :"ä"
+
+    lower_a_tilde.casecmp(lower_a_umlaut).should_not == 0
+    lower_a_umlaut.casecmp(lower_a_tilde).should_not == 0
+    upper_a_tilde.casecmp(upper_a_umlaut).should_not == 0
+    upper_a_umlaut.casecmp(upper_a_tilde).should_not == 0
+  end
+
+  it "doesn't do case mapping for non-ascii characters" do
+    # -- Latin-1 --
+    upper_a_tilde  = "\xC3".b.to_sym
+    upper_a_umlaut = "\xC4".b.to_sym
+    lower_a_tilde  = "\xE3".b.to_sym
+    lower_a_umlaut = "\xE4".b.to_sym
+
+    upper_a_tilde.casecmp(lower_a_tilde).should == -1
+    upper_a_umlaut.casecmp(lower_a_umlaut).should == -1
+    lower_a_tilde.casecmp(upper_a_tilde).should == 1
+    lower_a_umlaut.casecmp(upper_a_umlaut).should == 1
+
+    # -- UTF-8 --
+    upper_a_tilde  = :"Ã"
+    lower_a_tilde  = :"ã"
+    upper_a_umlaut = :"Ä"
+    lower_a_umlaut = :"ä"
+
+    upper_a_tilde.casecmp(lower_a_tilde).should == -1
+    upper_a_umlaut.casecmp(lower_a_umlaut).should == -1
+    lower_a_tilde.casecmp(upper_a_tilde).should == 1
+    lower_a_umlaut.casecmp(upper_a_umlaut).should == 1
+  end
+
+  it "returns 0 for empty strings in different encodings" do
+    ''.to_sym.casecmp(''.encode("UTF-32LE").to_sym).should == 0
+  end
+end
+
+describe "Symbol#casecmp" do
+  it "returns nil if other is a String" do
+    :abc.casecmp("abc").should == nil
+  end
+
+  it "returns nil if other is an Integer" do
+    :abc.casecmp(1).should == nil
+  end
+
+  it "returns nil if other is an object" do
+    obj = mock("string <=>")
+    :abc.casecmp(obj).should == nil
+  end
+end
+
+describe 'Symbol#casecmp?' do
+  it "compares symbols without regard to case" do
+    :abcdef.casecmp?(:abcde).should == false
+    :aBcDeF.casecmp?(:abcdef).should == true
+    :abcdef.casecmp?(:abcdefg).should == false
+    :abcdef.casecmp?(:ABCDEF).should == true
+  end
+
+  it "doesn't consider non-ascii characters equal that aren't" do
+    # -- Latin-1 --
+    upper_a_tilde  = "\xC3".b.to_sym
+    upper_a_umlaut = "\xC4".b.to_sym
+    lower_a_tilde  = "\xE3".b.to_sym
+    lower_a_umlaut = "\xE4".b.to_sym
+
+    lower_a_tilde.casecmp?(lower_a_umlaut).should_not == true
+    lower_a_umlaut.casecmp?(lower_a_tilde).should_not == true
+    upper_a_tilde.casecmp?(upper_a_umlaut).should_not == true
+    upper_a_umlaut.casecmp?(upper_a_tilde).should_not == true
+
+    # -- UTF-8 --
+    upper_a_tilde  = :"Ã"
+    lower_a_tilde  = :"ã"
+    upper_a_umlaut = :"Ä"
+    lower_a_umlaut = :"ä"
+
+    lower_a_tilde.casecmp?(lower_a_umlaut).should_not == true
+    lower_a_umlaut.casecmp?(lower_a_tilde).should_not == true
+    upper_a_tilde.casecmp?(upper_a_umlaut).should_not == true
+    upper_a_umlaut.casecmp?(upper_a_tilde).should_not == true
+  end
+
+  it "doesn't do case mapping for non-ascii and non-unicode characters" do
+    # -- Latin-1 --
+    upper_a_tilde  = "\xC3".b.to_sym
+    upper_a_umlaut = "\xC4".b.to_sym
+    lower_a_tilde  = "\xE3".b.to_sym
+    lower_a_umlaut = "\xE4".b.to_sym
+
+    upper_a_tilde.casecmp?(lower_a_tilde).should == false
+    upper_a_umlaut.casecmp?(lower_a_umlaut).should == false
+    lower_a_tilde.casecmp?(upper_a_tilde).should == false
+    lower_a_umlaut.casecmp?(upper_a_umlaut).should == false
+  end
+
+  it 'does case mapping for unicode characters' do
+    # -- UTF-8 --
+    upper_a_tilde  = :"Ã"
+    lower_a_tilde  = :"ã"
+    upper_a_umlaut = :"Ä"
+    lower_a_umlaut = :"ä"
+
+    upper_a_tilde.casecmp?(lower_a_tilde).should == true
+    upper_a_umlaut.casecmp?(lower_a_umlaut).should == true
+    lower_a_tilde.casecmp?(upper_a_tilde).should == true
+    lower_a_umlaut.casecmp?(upper_a_umlaut).should == true
+  end
+
+  it 'returns nil when comparing characters with different encodings' do
+    # -- Latin-1 --
+    upper_a_tilde = "\xC3".b.to_sym
+
+    # -- UTF-8 --
+    lower_a_tilde = :"ã"
+
+    upper_a_tilde.casecmp?(lower_a_tilde).should == nil
+    lower_a_tilde.casecmp?(upper_a_tilde).should == nil
+  end
+
+  it "returns true for empty symbols in different encodings" do
+    ''.to_sym.should.casecmp?(''.encode("UTF-32LE").to_sym)
+  end
+end