Class ActiveRecord::ConnectionAdapters::Mysql2Adapter::SchemaMigrationsTest < ActiveRecord::TestCase

# File activerecord/test/cases/adapters/mysql2/schema_migrations_test.rb, line 17
def test_initializes_schema_migrations_for_encoding_utf8mb4
  smtn = ActiveRecord::Migrator.schema_migrations_table_name
  connection.drop_table(smtn) if connection.table_exists?(smtn)

  database_name = connection.current_database
  database_info = connection.select_one("SELECT * FROM information_schema.schemata WHERE schema_name = '#{database_name}'")

  original_charset = database_info["DEFAULT_CHARACTER_SET_NAME"]
  original_collation = database_info["DEFAULT_COLLATION_NAME"]

  execute("ALTER DATABASE #{database_name} DEFAULT CHARACTER SET utf8mb4")

  connection.initialize_schema_migrations_table

  assert connection.column_exists?(smtn, :version, :string, limit: Mysql2Adapter::MAX_INDEX_LENGTH_FOR_UTF8MB4)
ensure
  execute("ALTER DATABASE #{database_name} DEFAULT CHARACTER SET #{original_charset} COLLATE #{original_collation}")
end

# File activerecord/test/cases/adapters/mysql2/schema_migrations_test.rb, line 7
def test_renaming_index_on_foreign_key
  connection.add_index "engines", "car_id"
  connection.add_foreign_key :engines, :cars, name: "fk_engines_cars"

  connection.rename_index("engines", "index_engines_on_car_id", "idx_renamed")
  assert_equal ["idx_renamed"], connection.indexes("engines").map(&:name)
ensure
  connection.remove_foreign_key :engines, name: "fk_engines_cars"
end