TST: remove never-used singleton fixtures#24885

Merged

jreback merged 4 commits intopandas-dev:masterfrom

jbrockmendel:singletons4

Feb 24, 2019

Commits on Jan 23, 2019

Commits on Feb 18, 2019

Merge branch 'master' of https://github.com/pandas-dev/pandas into singletons4
jbrockmendel
committed

Commits on Feb 22, 2019

Merge branch 'master' of https://github.com/pandas-dev/pandas into singletons4
jbrockmendel
committed