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/matrix/element_reference_spec.rb

@@ -0,0 +1,23 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require 'matrix'
+
+describe "Matrix#[]" do
+
+  before :all do
+    @m = Matrix[[0, 1, 2], [3, 4, 5], [6, 7, 8], [9, 10, 11]]
+  end
+
+  it "returns element at (i, j)" do
+    (0..3).each do |i|
+      (0..2).each do |j|
+        @m[i, j].should == (i * 3) + j
+      end
+    end
+  end
+
+  it "returns nil for an invalid index pair" do
+    @m[8,1].should be_nil
+    @m[1,8].should be_nil
+  end
+
+end