Dashboard warning when GC params are default

spec/models/admin_dashboard_data_spec.rb

@@ -40,4 +40,18 @@ describe AdminDashboardData do
     end
   end
 
+  describe 'gc_checks' do
+    subject { AdminDashboardData.new.gc_checks }
+
+    it 'returns nil when gc params are set' do
+      ENV.stubs(:[]).with('RUBY_GC_MALLOC_LIMIT').returns(90000000)
+      subject.should be_nil
+    end
+
+    it 'returns a string when gc params are not set' do
+      ENV.stubs(:[]).with('RUBY_GC_MALLOC_LIMIT').returns(nil)
+      subject.should_not be_nil
+    end
+  end
+
 end