Merge pull request #444 from anicholson/master

Make the NullStrategy API-complete

lib/database_cleaner/null_strategy.rb

@@ -11,5 +11,10 @@ def self.db=(connection)
     def self.clean
       # no-op
     end
+
+    def self.cleaning(&block)
+      # no-op
+      yield
+    end
   end
 end

spec/database_cleaner/null_strategy_spec.rb

@@ -0,0 +1,28 @@
+require 'spec_helper'
+
+module DatabaseCleaner
+  describe NullStrategy do
+      it 'responds to .start' do
+        expect { NullStrategy.start }.not_to raise_error(NoMethodError)
+      end
+
+      it 'responds to .clean' do
+        expect { NullStrategy.clean }.not_to raise_error(NoMethodError)
+      end
+
+      describe '.cleaning' do
+        it 'fails without a block' do
+          expect { NullStrategy.cleaning }.to raise_error(LocalJumpError)
+        end
+
+        it 'no-ops with a block' do
+          effect = double
+          expect(effect).to receive(:occur).once
+
+          NullStrategy.cleaning do
+            effect.occur
+          end
+        end
+      end
+  end
+end