例えばUser Agentの値で表示される画面を切り替える処理など、HTTPヘッダの値に処理が依存する場合にコントローラに渡すヘッダの値を上書きしたい場合など。request.envを使えば良い
describe TestController do
context 'iphon safari' do
request.env['HTTP_USER_AGENT'] = '…'
end
end
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