Intermittent error running tests

[tomfbiz]

While creating PR #125, travis failed : https://travis-ci.org/trenpixster/addict/builds/235564200

  1) test it injects the encrypted_password attribute with custom hasher (InjectHashTest)
     test/interactors/inject_hash_test.exs:11
     Assertion with == failed
     code: encrypted_password == "dumb-g0g0h0lm3s-password"
     lhs:  "$pbkdf2-sha512$100000$f0Q0GlXWDbWortkFb3TXgw$mUvh4Y/w57tqD5wDEvRIA0DcCjeKPVDK66375ILUy175iPL6dK6aaBMYgxLqeFmzMHj1qDeODRpf.i3lihYJfw"
     rhs:  "dumb-g0g0h0lm3s-password"
     stacktrace:
       test/interactors/inject_hash_test.exs:15
............
Finished in 4.5 seconds (2.0s on load, 2.5s on tests)
29 tests, 1 failure
Randomized with seed 8208

After committing a trivial change, the error went away.

I can't repro the issue locally -- I tried running mix test --seed 8208, but I did not receive any failures.