repair the activesupport message encryptor tests for me, do so in the same way as jeremy did with message verifier
repair the activesupport message encryptor tests for me, do so in the same way as jeremy did with message verifier

[#4517 state:committed]

Signed-off-by: Jeremy Kemper <b3f594e10a9edcf5413cf1190121d45078c62290@bitsweat.net>

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