Move spec/rubyspec to spec/ruby for consistency

* Other ruby implementations use the spec/ruby directory.
  [Misc #13792] [ruby-core:82287]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59979 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

spec/ruby/library/digest/hexencode_spec.rb

@@ -0,0 +1,31 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require 'digest'
+
+describe "Digest.hexencode" do
+  before :each do
+    @string   = 'sample string'
+    @encoded  = "73616d706c6520737472696e67"
+  end
+
+  it "returns '' when passed an empty String" do
+    Digest.hexencode('').should == ''
+  end
+
+  it "returns the hex-encoded value of a non-empty String" do
+    Digest.hexencode(@string).should == @encoded
+  end
+
+  it "calls #to_str on an object and returns the hex-encoded value of the result" do
+    obj = mock("to_str")
+    obj.should_receive(:to_str).and_return(@string)
+    Digest.hexencode(obj).should == @encoded
+  end
+
+  it "raises a TypeError when passed nil" do
+    lambda { Digest.hexencode(nil) }.should raise_error(TypeError)
+  end
+
+  it "raises a TypeError when passed a Fixnum" do
+    lambda { Digest.hexencode(9001) }.should raise_error(TypeError)
+  end
+end