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Rails test is converting my array of ints to an array of strings

You need to specify that the request not only accepts JSON (-H "Accept: application/json" in curl, request.env["HTTP_ACCEPT"] = 'application/json' in the test), but sends data as JSON (-H "Content-type: application/json" in curl, nothing in the test).

Try something like

post :create, params.to_json, format: :json


post :create, params.to_json, {'CONTENT_TYPE' =>

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