Fix: rule_spec should honor DB setting #339

Job	Run time
Lint	23s
Test (2.6, gemfiles/activerecord_5.0.2.gemfile)	2m 4s
Test (2.6, gemfiles/activerecord_5.1.0.gemfile)	1m 49s
Test (2.6, gemfiles/activerecord_5.2.2.gemfile)	1m 28s
Test (2.6, gemfiles/activerecord_6.0.0.gemfile)	1m 37s
Test (2.6, gemfiles/activerecord_6.1.0.gemfile)	1m 31s
Test (2.7, gemfiles/activerecord_5.0.2.gemfile)	1m 27s
Test (2.7, gemfiles/activerecord_5.1.0.gemfile)	1m 29s
Test (2.7, gemfiles/activerecord_5.2.2.gemfile)	1m 21s
Test (2.7, gemfiles/activerecord_6.0.0.gemfile)	1m 34s
Test (2.7, gemfiles/activerecord_6.1.0.gemfile)	1m 20s
Test (2.7, gemfiles/activerecord_main.gemfile)	45s
Test (3.0, gemfiles/activerecord_6.0.0.gemfile)	1m 12s
Test (3.0, gemfiles/activerecord_6.1.0.gemfile)	1m 16s
Test (3.0, gemfiles/activerecord_main.gemfile)	1m 12s
Test (jruby, gemfiles/activerecord_5.1.0.gemfile)	1m 10s
Test (jruby, gemfiles/activerecord_5.2.2.gemfile)	2m 1s
Test (jruby, gemfiles/activerecord_6.0.0.gemfile)	2m 42s
Test (truffleruby, gemfiles/activerecord_6.0.0.gemfile)	51s
Test (truffleruby, gemfiles/activerecord_6.1.0.gemfile)	1m 12s
Test (truffleruby, gemfiles/activerecord_main.gemfile)	59s
Test (gemfiles/activerecord_7.0.0.gemfile, 3.1)	1m 9s
Test (gemfiles/activerecord_7.0.0.gemfile, 3.0)	1m 10s
Test (gemfiles/activerecord_6.1.0.gemfile, 3.1)	1m 6s
	32m 48s

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