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Locally within an virtualenv there are two methods you could use to test this. The first is a tool which is installed via the Heroku toolbelt (https://toolbelt.heroku.com/). The tool is foreman. It will export all of your environment variables that are stored in a .env file locally and then run app processes within your Procfile.
The second way if you're looking for a lighter approach is to have a .env file locally then run:
export $(cat .env)