Fix broken tests for older Rails versions #476

Job	Run time
rails_edge	30s
Ruby 3.0 (gemfiles/rails_6_0.gemfile)	42s
ruby_edge (gemfiles/rails_6_0.gemfile)	1m 42s
Ruby 3.0 (gemfiles/rails_6_1.gemfile)	41s
ruby_edge (gemfiles/rails_6_1.gemfile)	1m 37s
Ruby 3.0 (gemfiles/rails_7_0.gemfile)	45s
ruby_edge (gemfiles/rails_7_0.gemfile)	1m 33s
Ruby 3.0 (gemfiles/rails_7_1.gemfile)	41s
ruby_edge (gemfiles/rails_7_1.gemfile)	1m 49s
Ruby 3.1 (gemfiles/rails_6_0.gemfile)	50s
Ruby 3.1 (gemfiles/rails_6_1.gemfile)	41s
Ruby 3.1 (gemfiles/rails_7_0.gemfile)	41s
Ruby 3.1 (gemfiles/rails_7_1.gemfile)	43s
Ruby 3.2 (gemfiles/rails_6_0.gemfile)	44s
Ruby 3.2 (gemfiles/rails_6_1.gemfile)	43s
Ruby 3.2 (gemfiles/rails_7_0.gemfile)	45s
Ruby 3.2 (gemfiles/rails_7_1.gemfile)	41s
Ruby 3.3 (gemfiles/rails_6_0.gemfile)	52s
Ruby 3.3 (gemfiles/rails_6_1.gemfile)	52s
Ruby 3.3 (gemfiles/rails_7_0.gemfile)	50s
Ruby 3.3 (gemfiles/rails_7_1.gemfile)	51s
	19m 13s

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