(CONT-666) Update resource_index spec tests

This commit introduces some new spec test for the resource_indexes
method.

We check that it does not pick up any defaults declarations and also
that it can properly parse resource declarations after the change.

spec/unit/puppet-lint/data_spec.rb

@@ -33,6 +33,42 @@
         }
       end
     end
+
+    context 'when given a defaults declaration' do
+      let(:manifest) { "Service { 'foo': }" }
+
+      it 'returns an empty array' do
+        expect(data.resource_indexes).to eq([])
+      end
+    end
+
+    context 'when given a set of resource declarations' do
+      let(:manifest) { <<-MANIFEST }
+        service {
+          'foo':
+            ensure => running,
+        }
+
+        service {
+          'bar':
+            ensure => running;
+          'foobar':
+            ensure => stopped;
+        }
+
+        service { ['first', 'second']:
+          ensure => running,
+        }
+
+        service { 'third':
+          ensure => running,
+        }
+      MANIFEST
+
+      it 'returns an array of resource indexes' do
+        expect(data.resource_indexes.length).to eq(5)
+      end
+    end
   end
 
   describe '.insert' do