Extensive use of Guava preconditions
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Key: DROIDS-129
URL: https://issues.apache.org/jira/browse/DROIDS-129
Project: Droids
Issue Type: Improvement
Affects Versions: 0.0.2
Reporter: Bertil Chapuis
Guava has been introduced in 0.0.1 but is not extensively used in Droids yet.
We also could catch this opportunity to create a better test coverage.
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