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/core/string/sum_spec.rb

@@ -0,0 +1,22 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes.rb', __FILE__)
+
+describe "String#sum" do
+  it "returns a basic n-bit checksum of the characters in self" do
+    "ruby".sum.should == 450
+    "ruby".sum(8).should == 194
+    "rubinius".sum(23).should == 881
+  end
+
+  it "tries to convert n to an integer using to_int" do
+    obj = mock('8')
+    obj.should_receive(:to_int).and_return(8)
+
+    "hello".sum(obj).should == "hello".sum(8)
+  end
+
+  it "returns sum of the bytes in self if n less or equal to zero" do
+    "xyz".sum(0).should == 363
+    "xyz".sum(-10).should == 363
+  end
+end