Add unit test for mutator/entry/entry.go
Add unit test for mutator/entry/entry.go

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