A small mistake sent me on an overly long investigation into Minitest hooks, and how Rails integrates with these.

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Mixing Minitest::Spec's `before` block with Rails' `setup` block in the same test file causes subtle, hard-to-debug failures. The root cause is that Rails hooks its `setup` block into Minitest's `before_setup` lifecycle hook (via a prepended module on ActiveSupport::TestCase), meaning it always runs before the `before` block regardless of declaration order. The fix is simple: in a Rails app using Minitest::Spec, never mix `setup` and `before` blocks in the same test file.

Using Minitest::Spec in Rails? Watch out for the lifecycle hooks!