Since Rails 6.0 tests can be made faster by adding:

ActiveRecord::ConnectionAdapters::PostgreSQLAdapter.create_unlogged_tables = true

to config/environment/test.rb. For more info:

• https://www.postgresql.org/docs/current/sql-createtable.html#SQL-CREATETABLE-UNLOGGED
• https://github.com/rails/rails/commit/e1290a87b1c0f49d2a258d4be2600f78ca4767ad