Add specs for --order config methods.

spec/rspec/core/configuration_spec.rb

@@ -937,5 +937,37 @@ def metadata_hash(*args)
         end
       end
     end
+
+    describe '#randomize?' do
+      context 'with order set to :random' do
+        before { config.order = :random }
+
+        it 'returns true' do
+          config.randomize?.should be_true
+        end
+      end
+
+      context 'with order set to nil' do
+        before { config.order = nil }
+
+        it 'returns false' do
+          config.randomize?.should be_false
+        end
+      end
+    end
+
+    describe '#orderby=' do
+      context 'given "random:123"' do
+        before { config.orderby = 'random:123' }
+
+        it 'sets order to "random"' do
+          config.order.should eq('random')
+        end
+
+        it 'sets seed to 123' do
+          config.seed.should eq(123)
+        end
+      end
+    end
   end
 end