MAINT remove unnecessary tested object and hash
MAINT remove unnecessary tested object and hash

It is already tested in test_hashes_stay_the_same

aabadie/joblib,lesteve/joblib,aabadie/joblib,joblib/joblib,lesteve/joblib,joblib/joblib,tomMoral/joblib,karandesai-96/joblib,karandesai-96/joblib,tomMoral/joblib