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/date/plus_spec.rb

@@ -0,0 +1,20 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require 'date'
+
+describe "Date#+" do
+  before :all do
+    @date = Date.civil(2000, 1, 1)
+  end
+
+  it "returns a new Date object that is n days later than the current one" do
+    (@date + 31).should == Date.civil(2000, 2, 1)
+  end
+
+  it "accepts a negative argument and returns a new Date that is earlier than the current one" do
+    (@date + -1).should == Date.civil(1999, 12, 31)
+  end
+
+  it "raises TypeError if argument is not Numeric" do
+    lambda { Date.today + Date.today }.should raise_error(TypeError)
+  end
+end