Disable IdentityMap in log tests, it's not important and when running tests rake task it logs more messages in the tested buffer.
Disable IdentityMap in log tests, it's not important and when running tests rake task it logs more messages in the tested buffer.

Signed-off-by: José Valim <0c2436ea76ed86e37cc05f66dea18d48ef390882@gmail.com>

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