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The unit tests have a lot of examples you can play around with.  If you look at <https://github.com/infracost/infracost/tree/master/internal/providers/terraform/aws/testdata/instance_test|this directory> you can see a `.tf` file, a `.usage.yml` file, and the output it produced saved in a `.golden`.  For example the all-front instance show up like <https://github.com/infracost/infracost/blob/master/internal/providers/terraform/aws/testdata/instance_test/instance_test.golden#L7|this>.