Added tests for new list_ methods.
Added tests for new list_ methods.

james-monkeyshines/ensembl,muffato/ensembl,danstaines/ensembl,at7/ensembl,Ensembl/ensembl,mjg17/ensembl,james-monkeyshines/ensembl,danstaines/ensembl,james-monkeyshines/ensembl,danstaines/ensembl,james-monkeyshines/ensembl,willmclaren/ensembl,mjg17/ensembl,muffato/ensembl,muffato/ensembl,at7/ensembl,willmclaren/ensembl,Ensembl/ensembl,at7/ensembl,muffato/ensembl,mjg17/ensembl,mjg17/ensembl,Ensembl/ensembl,Ensembl/ensembl,at7/ensembl