Add to CI matrix

.github/workflows/CI.yml

@@ -16,6 +16,7 @@ jobs:
           - '3.0'
           - '2.7'
         activerecord:
+          - '7.0'
           - '6.1'
           - '6.0'
           - '5.2'

gemfiles/activerecord_7.0.gemfile

@@ -0,0 +1,5 @@
+source "https://rubygems.org"
+
+gemspec path: "../"
+
+gem "activerecord", "~> 7.0.0"

spec/support/database.rb

@@ -17,7 +17,8 @@ module ActiveRecord::Import::Connection
 ActiveRecord::Base.configurations = YAML.load_file(database_yml)
 ActiveRecord::Base.logger = Logger.new(File.join(File.dirname(__FILE__), '../debug.log'))
 ActiveRecord::Base.logger.level = ENV['CI'] ? ::Logger::ERROR : ::Logger::DEBUG
-config = ActiveRecord::Base.configurations[db_name]
+configs = ActiveRecord::Base.configurations
+config = configs.try(:find_db_config, db_name) || configs[db_name]
 
 begin
   ActiveRecord::Base.establish_connection(db_name.to_sym)