Raise an error if the connection name doesn't match the adapter

This will prevent us from accidentally running mysql2 tests against
trilogy adapter as we currently are doing.

Author: eileencodes

activerecord/test/support/connection.rb

@@ -25,5 +25,12 @@ def self.connect
     ActiveRecord::Base.configurations = test_configuration_hashes
     ActiveRecord::Base.establish_connection :arunit
     ARUnit2Model.establish_connection :arunit2
+
+    arunit_adapter = ActiveRecord::Base.connection.pool.db_config.adapter
+
+    if connection_name != arunit_adapter
+      return if connection_name == "sqlite3_mem" && arunit_adapter == "sqlite3"
+      raise ArgumentError, "The connection name did not match the adapter name. Connection name is '#{connection_name}' and the adapter name is '#{arunit_adapter}'."
+    end
   end
 end