Fix integration tests

[chriskdon]

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Fixes two broken integration tests.

The transaction test is not pattern matching on the correct error format. The condition check test has a match on an incorrect value.

I would have expected CI to catch these. However, it appears the CI runner is not running the integration tests. This is likely because the config/ddb_local_test.exs file must be manually created to run those tests. I am happy to look into this and open another PR if they are supposed to be running.