Add test [fixup]

spec/active_triples/rdf_source_spec.rb

@@ -1,11 +1,44 @@
 require 'spec_helper'
 
 describe ActiveTriples::RDFSource do
-  let(:dummy_source) { Class.new { include ActiveTriples::RDFSource } }
+
+  let(:source_class) { Class.new { include ActiveTriples::RDFSource } }
+  let(:uri) { RDF::URI('http://example.org/moomin') }
 
   subject { source_class.new }
 
+  describe '#==' do
+
+    shared_examples 'Term equality' do
+      it 'equals itself' do
+        expect(subject).to eq subject
+      end
+
+      it 'equals its clone' do
+        expect(subject).to eq source_class.new(subject.rdf_subject)
+      end
+
+      it 'does not equal another term' do
+        expect(subject).not_to eq RDF::Node.new
+      end
+
+      it 'does not equal another term' do
+        expect(subject).not_to eq source_class.new
+      end
+    end
+
+    include_examples 'Term equality'
+
+    context 'with a URI' do
+      include_examples 'Term equality' do
+        subject { source_class.new(uri) }
+      end
+    end
+  end
+
   describe ".apply_schema" do
+    let(:dummy_source) { Class.new { include ActiveTriples::RDFSource } }
+
     before do
       class MyDataModel < ActiveTriples::Schema
         property :test_title, :predicate => RDF::DC.title