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Testing Elixir: B5 Page 172 File name should be error_helpers.ex
Title: Testing Elixir B5 (page 172)
Inside the “Modified Boiler Plate” info box, the filename for error_tag/3 should be “lib/not_skull_web/views/error_helpers.ex” instead of “not_skull/test/support/assertion_helpers.ex”.
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