Removed tests that no longer need to be coerced

test/cases/coerced_tests.rb

@@ -229,18 +229,6 @@ def test_update_date_time_attributes_with_default_timezone_local
       end
     end
   end
-
-  # SQL Server does not have query for release_savepoint
-  coerce_tests! %r{an empty transaction does not raise if preventing writes}
-  test "an empty transaction does not raise if preventing writes coerced" do
-    ActiveRecord::Base.while_preventing_writes do
-      assert_queries_count(1, include_schema: true) do
-        Bird.transaction do
-          ActiveRecord::Base.lease_connection.materialize_transactions
-        end
-      end
-    end
-  end
 end
 
 class BelongsToAssociationsTest < ActiveRecord::TestCase
@@ -2368,20 +2356,6 @@ def test_preloads_belongs_to_a_composite_primary_key_model_through_id_attribute_
   end
 end
 
-class BasePreventWritesTest < ActiveRecord::TestCase
-  # SQL Server does not have query for release_savepoint
-  coerce_tests! %r{an empty transaction does not raise if preventing writes}
-  test "an empty transaction does not raise if preventing writes coerced" do
-    ActiveRecord::Base.while_preventing_writes do
-      assert_queries_count(1, include_schema: true) do
-        Bird.transaction do
-          ActiveRecord::Base.lease_connection.materialize_transactions
-        end
-      end
-    end
-  end
-end
-
 class MigratorTest < ActiveRecord::TestCase
   # Test fails on Windows AppVeyor CI for unknown reason.
   coerce_tests! :test_migrator_db_has_no_schema_migrations_table if RbConfig::CONFIG["host_os"] =~ /mswin|mingw/