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/random/shared/urandom.rb

@@ -0,0 +1,23 @@
+describe :random_urandom, shared: true do
+  it "returns a String" do
+    Random.send(@method, 1).should be_an_instance_of(String)
+  end
+
+  it "returns a String of the length given as argument" do
+    Random.send(@method, 15).length.should == 15
+  end
+
+  it "raises an ArgumentError on a negative size" do
+    lambda {
+      Random.send(@method, -1)
+    }.should raise_error(ArgumentError)
+  end
+
+  it "returns an ASCII-8BIT String" do
+    Random.send(@method, 15).encoding.should == Encoding::ASCII_8BIT
+  end
+
+  it "returns a random binary String" do
+    Random.send(@method, 12).should_not == Random.send(@method, 12)
+  end
+end