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I want to test that certain conditions hold after running a migration I've written. What's the current best way to do that? To make this concrete: I made a migration that adds a column to a model, and gives it a default value. But I forgot to update all the pre-existing instances of that model to have that default value for the new column. None of my existing tests will catch that, because they al
100% code coverage, right? Yes, I know, you don't merge code in master that is not fully tested and all that stuff. Yet I'm almost sure there's one thing that you may be pushing to production without any tests on it: your data migrations. For example you could have this code: class RemoveEmailFromUsers < ActiveRecord::Migration[5.1] def up # Before dropping the email column from users table let's
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