tests/lib/test_sql: Use test class to get rid of global context variable
tests/lib/test_sql: Use test class to get rid of global context variable

shadowoneau/skylines,kerel-fs/skylines,skylines-project/skylines,shadowoneau/skylines,Harry-R/skylines,TobiasLohner/SkyLines,RBE-Avionik/skylines,Turbo87/skylines,Harry-R/skylines,Turbo87/skylines,kerel-fs/skylines,shadowoneau/skylines,TobiasLohner/SkyLines,kerel-fs/skylines,Harry-R/skylines,skylines-project/skylines,Turbo87/skylines,skylines-project/skylines,RBE-Avionik/skylines,shadowoneau/skylines,snip/skylines,snip/skylines,Harry-R/skylines,TobiasLohner/SkyLines,skylines-project/skylines,RBE-Avionik/skylines,RBE-Avionik/skylines,snip/skylines,Turbo87/skylines