give up on dropping and recreating db for teardown and setup.

db/sample.config.yml

@@ -30,3 +30,5 @@ sqlite3:
   database: db/test.sqlite3
   pool: 5
   timeout: 5000
+  encoding: utf8
+

spec/support/active_record/base_helper.rb

@@ -20,7 +20,10 @@ class BaseHelper
   end
 
   def teardown
-    ActiveRecord::Base.connection.drop_database default_config['database']
+    tables = %w(users agents)
+    tables.each do |table|
+      connection.execute "DROP TABLE IF EXISTS #{table}"
+    end
   end
 
   private
@@ -28,5 +31,10 @@ class BaseHelper
   def establish_connection(config = default_config)
     ActiveRecord::Base.establish_connection(config)
   end
+
+  def create_db
+    establish_connection default_config.merge("database" => nil)
+    connection.execute "CREATE DATABASE IF NOT EXISTS #{default_config['database']}"
+  end
 end
 

spec/support/active_record/mysql2_helper.rb

@@ -14,13 +14,6 @@ class MySQL2Helper < BaseHelper
     db_config['mysql2']
   end
 
-  def create_db
-    establish_connection(default_config.merge("database" => nil))
-
-    ActiveRecord::Base.connection.drop_database default_config['database'] rescue nil
-    ActiveRecord::Base.connection.create_database default_config['database']
-  end
-
   def patch_mysql2_adapter
     # remove DEFAULT NULL from column definition, which is an error on primary keys in MySQL 5.7.3+
     ActiveRecord::ConnectionAdapters::Mysql2Adapter::NATIVE_DATABASE_TYPES[:primary_key] = "int(11) auto_increment PRIMARY KEY"

spec/support/active_record/mysql_helper.rb

@@ -14,13 +14,6 @@ class MySQLHelper < BaseHelper
     db_config['mysql']
   end
 
-  def create_db
-    ActiveRecord::Base.establish_connection default_config.merge("database" => nil)
-    ActiveRecord::Base.connection.drop_database default_config['database'] rescue nil
-    ActiveRecord::Base.connection.create_database default_config['database']
-    ActiveRecord::Base.establish_connection default_config
-  end
-
   def patch_mysql_adapter
     # remove DEFAULT NULL from column definition, which is an error on primary keys in MySQL 5.7.3+
     ActiveRecord::ConnectionAdapters::MysqlAdapter::NATIVE_DATABASE_TYPES[:primary_key] = "int(11) auto_increment PRIMARY KEY"

spec/support/active_record/postgresql_helper.rb

@@ -3,11 +3,6 @@ require 'support/active_record/base_helper'
 class PostgreSQLHelper < BaseHelper
   puts "Active Record #{ActiveRecord::VERSION::STRING}, pg"
 
-  def teardown
-    ActiveRecord::Base.connection.execute "DROP TABLE users, agents;"
-  rescue ActiveRecord::StatementInvalid
-  end
-
   private
 
   def default_config
@@ -15,9 +10,8 @@ class PostgreSQLHelper < BaseHelper
   end
 
   def create_db
-    @encoding = default_config['encoding'] || ENV['CHARSET'] || 'utf8'
-    establish_connection(default_config.merge('database' => 'postgres', 'schema_search_path' => 'public'))
-    ActiveRecord::Base.connection.create_database(default_config['database'], default_config.merge('encoding' => @encoding))
+    establish_connection default_config.merge('database' => 'postgres', 'schema_search_path' => 'public')
+    connection.execute "CREATE DATABASE #{default_config['database']}"
   rescue ActiveRecord::StatementInvalid
   end
 end

spec/support/active_record/sqlite3_helper.rb

@@ -3,20 +3,18 @@ require 'support/active_record/base_helper'
 class SQLite3Helper < BaseHelper
   puts "Active Record #{ActiveRecord::VERSION::STRING}, sqlite3"
 
-  def teardown
-    ActiveRecord::Base.connection.truncate_table('users')
-    ActiveRecord::Base.connection.truncate_table('agents')
-  end
-
   private
 
   def default_config
     db_config['sqlite3']
   end
 
+  def establish_connection
+    super default_config.merge('database' => 'sqlite3', 'schema_search_path' => 'public')
+  end
+
   def create_db
-    @encoding = default_config['encoding'] || ENV['CHARSET'] || 'utf8'
-    establish_connection(default_config.merge('database' => 'sqlite3', 'schema_search_path' => 'public'))
+    # NO-OP
   end
 end