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由 yuuji.yaginuma 提交于
`ActiveModel::TestCase` is used only for the test of Active Model. Also, it is a private API and can not be used in applications. Therefore, it is not necessary to include it in lib.
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`ActiveModel::TestCase` is used only for the test of Active Model. Also, it is a private API and can not be used in applications. Therefore, it is not necessary to include it in lib.