Fix transaction check and enable local running of spec.

Author: gkellogg

lib/rdf/spec/transaction.rb

@@ -212,10 +212,10 @@
         with_name = st.dup
         with_name.graph_name = graph_uri
 
-        expect do 
+        expect do
           subject.insert(st)
           subject.execute
-        end.to change { subject.repository }
+        end.to change { subject.repository.statements }
 
         expect(subject.repository).to have_statement(with_name)
       end

spec/transaction_spec.rb

@@ -1,7 +1,8 @@
 require File.join(File.dirname(__FILE__), 'spec_helper')
 require 'rdf/spec/transaction'
 
-describe RDF::Transaction, skip: "pending fixes to immutability errors" do
+describe RDF::Transaction do
+  let(:repository) { RDF::Repository.new }
   # @see lib/rdf/spec/transaction.rb in rdf-spec
   it_behaves_like "an RDF::Transaction", RDF::Transaction
 end