Add unit tests for client package
Add unit tests for client package

gdbelvin/keytransparency,AMarcedone/keytransparency,cesarghali/keytransparency,gdbelvin/keytransparency,AMarcedone/keytransparency,alsophian/keytransparency,alsophian/keytransparency,cesarghali/keytransparency,google/keytransparency,google/keytransparency