add tests for list of declared constituencies
add tests for list of declared constituencies

check that the list contains declared and non declared constituencies,
correctly formatted, and that the counts/progress are correct

neavouli/yournextrepresentative,mysociety/yournextmp-popit,neavouli/yournextrepresentative,mysociety/yournextrepresentative,datamade/yournextmp-popit,mysociety/yournextrepresentative,mysociety/yournextmp-popit,datamade/yournextmp-popit,datamade/yournextmp-popit,mysociety/yournextrepresentative,DemocracyClub/yournextrepresentative,datamade/yournextmp-popit,DemocracyClub/yournextrepresentative,neavouli/yournextrepresentative,mysociety/yournextmp-popit,mysociety/yournextmp-popit,mysociety/yournextrepresentative,neavouli/yournextrepresentative,DemocracyClub/yournextrepresentative,neavouli/yournextrepresentative,datamade/yournextmp-popit,mysociety/yournextmp-popit,mysociety/yournextrepresentative