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/env/shared/key.rb

@@ -0,0 +1,15 @@
+describe :env_key, shared: true do
+  it "needs to be reviewed for completeness"
+
+  it "returns the index associated with the passed value" do
+    ENV["foo"] = "bar"
+    ENV.send(@method, "bar").should == "foo"
+    ENV.delete "foo"
+  end
+
+  it "returns nil if the passed value is not found" do
+    ENV.send(@method, "should_never_be_set").should be_nil
+  end
+end
+
+