Perhaps this is due to the fact that you are loading them into the preview block. If you download material, your test runs faster, but sometimes you need to reload. You can load the "each_run" block, but the test will be slower. If you prefer speed, you can restart the Spork server when you see that you need a reboot. Thus, the pre-production block will start again, and your models and helpers will be rebooted.
mornaner
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