diff --git a/spec/database_cleaner/active_record/truncation/mysql2_spec.rb b/spec/database_cleaner/active_record/truncation/mysql2_spec.rb
index 306a8bb..d7c26a0 100644
--- a/spec/database_cleaner/active_record/truncation/mysql2_spec.rb
+++ b/spec/database_cleaner/active_record/truncation/mysql2_spec.rb
@@ -3,35 +3,41 @@ require 'support/active_record/mysql2_setup'
 require 'database_cleaner/active_record/truncation'
 require 'database_cleaner/active_record/truncation/shared_fast_truncation'
 
-module ActiveRecord
-  module ConnectionAdapters
-    describe do
-      before(:all) { MySQL2Helper.active_record_mysql2_setup }
+describe DatabaseCleaner::ActiveRecord::Truncation do
+  let(:helper) { MySQL2Helper.new }
 
-      let(:connection) { MySQL2Helper.active_record_mysql2_connection }
+  let(:connection) do
+    helper.active_record_mysql2_connection
+  end
 
-      describe "#truncate_table" do
-        it "should truncate the table" do
-          2.times { User.create }
+  around do |example|
+    helper.active_record_mysql2_setup
 
-          connection.truncate_table('users')
-          expect(User.count).to eq 0
-        end
+    example.run
 
-        it "should reset AUTO_INCREMENT index of table" do
-          2.times { User.create }
-          User.delete_all
+    helper.active_record_mysql2_teardown
+  end
 
-          connection.truncate_table('users')
+  describe "AR connection adapter monkeypatches" do
+    describe "#truncate_table" do
+      it "should truncate the table" do
+        2.times { User.create }
 
-          expect(User.create.id).to eq 1
-        end
+        connection.truncate_table('users')
+        expect(User.count).to eq 0
       end
 
-      it_behaves_like "an adapter with pre-count truncation" do
-        let(:connection) { MySQL2Helper.active_record_mysql2_connection }
+      it "should reset AUTO_INCREMENT index of table" do
+        2.times { User.create }
+        User.delete_all
+
+        connection.truncate_table('users')
+
+        expect(User.create.id).to eq 1
       end
     end
+
+    it_behaves_like "an adapter with pre-count truncation"
   end
 end
 
diff --git a/spec/database_cleaner/active_record/truncation/mysql_spec.rb b/spec/database_cleaner/active_record/truncation/mysql_spec.rb
index 20e946c..468aca8 100644
--- a/spec/database_cleaner/active_record/truncation/mysql_spec.rb
+++ b/spec/database_cleaner/active_record/truncation/mysql_spec.rb
@@ -3,35 +3,41 @@ require 'support/active_record/mysql_setup'
 require 'database_cleaner/active_record/truncation'
 require 'database_cleaner/active_record/truncation/shared_fast_truncation'
 
-module ActiveRecord
-  module ConnectionAdapters
-    describe do
-      before(:all) { MySQLHelper.active_record_mysql_setup }
+describe DatabaseCleaner::ActiveRecord::Truncation do
+  let(:helper) { MySQLHelper.new }
 
-      let(:connection) { MySQLHelper.active_record_mysql_connection }
+  let(:connection) do
+    helper.active_record_mysql_connection
+  end
 
-      describe "#truncate_table" do
-        it "should truncate the table" do
-          2.times { User.create }
+  around do |example|
+    helper.active_record_mysql_setup
 
-          connection.truncate_table('users')
-          expect(User.count).to eq 0
-        end
+    example.run
 
-        it "should reset AUTO_INCREMENT index of table" do
-          2.times { User.create }
-          User.delete_all
+    helper.active_record_mysql_teardown
+  end
 
-          connection.truncate_table('users')
+  describe "AR connection adapter monkeypatches" do
+    describe "#truncate_table" do
+      it "should truncate the table" do
+        2.times { User.create }
 
-          expect(User.create.id).to eq 1
-        end
+        connection.truncate_table('users')
+        expect(User.count).to eq 0
       end
 
-      it_behaves_like "an adapter with pre-count truncation" do
-        let(:connection) { MySQLHelper.active_record_mysql_connection }
+      it "should reset AUTO_INCREMENT index of table" do
+        2.times { User.create }
+        User.delete_all
+
+        connection.truncate_table('users')
+
+        expect(User.create.id).to eq 1
       end
     end
+
+    it_behaves_like "an adapter with pre-count truncation"
   end
 end
 
diff --git a/spec/database_cleaner/active_record/truncation/postgresql_spec.rb b/spec/database_cleaner/active_record/truncation/postgresql_spec.rb
index 316bb98..8e7e085 100644
--- a/spec/database_cleaner/active_record/truncation/postgresql_spec.rb
+++ b/spec/database_cleaner/active_record/truncation/postgresql_spec.rb
@@ -3,72 +3,76 @@ require 'support/active_record/postgresql_setup'
 require 'database_cleaner/active_record/truncation'
 require 'database_cleaner/active_record/truncation/shared_fast_truncation'
 
-module ActiveRecord
-  module ConnectionAdapters
-    describe "schema_migrations table" do
-      it "is not truncated" do
-        PostgreSQLHelper.active_record_pg_migrate
-        DatabaseCleaner::ActiveRecord::Truncation.new.clean
-        result = PostgreSQLHelper.active_record_pg_connection.execute("select count(*) from schema_migrations;")
-        expect(result.values.first).to eq ["2"]
+describe DatabaseCleaner::ActiveRecord::Truncation do
+  let(:helper) { PostgreSQLHelper.new }
+
+  let(:connection) do
+    helper.active_record_pg_connection
+  end
+
+  around do |example|
+    helper.active_record_pg_setup
+
+    example.run
+
+    helper.active_record_pg_teardown
+  end
+
+  describe "AR connection adapter monkeypatches" do
+    describe "#truncate_table" do
+      it "truncates the table" do
+        2.times { User.create }
+
+        connection.truncate_table('users')
+        expect(User.count).to eq 0
+      end
+
+      it "truncates the table without id sequence" do
+        2.times { Agent.create }
+
+        connection.truncate_table('agents')
+        expect(Agent.count).to eq 0
+      end
+
+      it "resets AUTO_INCREMENT index of table" do
+        2.times { User.create }
+        User.delete_all
+
+        connection.truncate_table('users')
+
+        expect(User.create.id).to eq 1
       end
     end
+  end
 
-    describe do
-      before(:all) { PostgreSQLHelper.active_record_pg_setup }
+  describe ":except option cleanup" do
+    it "should not truncate the tables specified in the :except option" do
+      2.times { User.create }
 
-      let(:connection) do
-        PostgreSQLHelper.active_record_pg_connection
-      end
+      described_class.new(except: ['users']).clean
 
-      before(:each) do
-        connection.truncate_tables connection.tables
-      end
+      expect( User.count ).to eq 2
+    end
+  end
 
-      describe "#truncate_table" do
-        it "truncates the table" do
-          2.times { User.create }
+  describe '#database_cleaner_table_cache' do
+    it 'should default to the list of tables with their schema' do
+      expect(connection.database_cleaner_table_cache.first).to match(/^public\./)
+    end
+  end
 
-          connection.truncate_table('users')
-          expect(User.count).to eq 0
-        end
+  it_behaves_like "an adapter with pre-count truncation"
 
-        it "truncates the table without id sequence" do
-          2.times { Agent.create }
+  describe "schema_migrations table" do
+    it "is not truncated" do
+      helper.active_record_pg_teardown
+      helper.active_record_pg_migrate
 
-          connection.truncate_table('agents')
-          expect(Agent.count).to eq 0
-        end
-
-        it "resets AUTO_INCREMENT index of table" do
-          2.times { User.create }
-          User.delete_all
-
-          connection.truncate_table('users')
-
-          expect(User.create.id).to eq 1
-        end
-      end
-
-      describe ":except option cleanup" do
-        it "should not truncate the tables specified in the :except option" do
-          2.times { User.create }
-
-          DatabaseCleaner::ActiveRecord::Truncation.new(:except => ['users']).clean
-          expect( User.count ).to eq 2
-        end
-      end
-
-      describe '#database_cleaner_table_cache' do
-        it 'should default to the list of tables with their schema' do
-          expect(connection.database_cleaner_table_cache.first).to match(/^public\./)
-        end
-      end
-
-      it_behaves_like "an adapter with pre-count truncation" do
-        let(:connection) { PostgreSQLHelper.active_record_pg_connection }
-      end
+      subject.clean
 
+      result = connection.execute("select count(*) from schema_migrations;")
+      expect(result.values.first).to eq ["2"]
     end
   end
 end
+
diff --git a/spec/database_cleaner/active_record/truncation/sqlite3_spec.rb b/spec/database_cleaner/active_record/truncation/sqlite3_spec.rb
index 0bf005c..f9f4f28 100644
--- a/spec/database_cleaner/active_record/truncation/sqlite3_spec.rb
+++ b/spec/database_cleaner/active_record/truncation/sqlite3_spec.rb
@@ -2,37 +2,38 @@ require 'active_record'
 require 'support/active_record/sqlite3_setup'
 require 'database_cleaner/active_record/truncation'
 
-module ActiveRecord
-  module ConnectionAdapters
-    describe do
-      before(:all) { SQLite3Helper.active_record_sqlite3_setup }
+describe DatabaseCleaner::ActiveRecord::Truncation do
+  let(:helper) { SQLite3Helper.new }
 
-      let(:connection) do
-        SQLite3Helper.active_record_sqlite3_connection
+  let(:connection) do
+    helper.active_record_sqlite3_connection
+  end
+
+  around do |example|
+    helper.active_record_sqlite3_setup
+
+    example.run
+
+    helper.active_record_sqlite3_teardown
+  end
+
+  describe "AR connection adapter monkeypatches" do
+    describe "#truncate_table" do
+      it "truncates the table" do
+        2.times { User.create }
+
+        connection.truncate_table('users')
+        expect(User.count).to eq 0
       end
 
-      before(:each) do
-        connection.truncate_tables connection.tables
+      it "resets AUTO_INCREMENT index of table" do
+        2.times { User.create }
+        User.delete_all
+
+        connection.truncate_table('users')
+
+        expect(User.create.id).to eq 1
       end
-
-      describe "#truncate_table" do
-        it "truncates the table" do
-          2.times { User.create }
-
-          connection.truncate_table('users')
-          expect(User.count).to eq 0
-        end
-
-        it "resets AUTO_INCREMENT index of table" do
-          2.times { User.create }
-          User.delete_all
-
-          connection.truncate_table('users')
-
-          expect(User.create.id).to eq 1
-        end
-      end
-
     end
   end
 end
diff --git a/spec/database_cleaner/data_mapper/truncation/sqlite3_spec.rb b/spec/database_cleaner/data_mapper/truncation/sqlite3_spec.rb
index 0dc8c98..a014569 100644
--- a/spec/database_cleaner/data_mapper/truncation/sqlite3_spec.rb
+++ b/spec/database_cleaner/data_mapper/truncation/sqlite3_spec.rb
@@ -3,37 +3,37 @@ require 'dm-sqlite-adapter'
 require 'support/data_mapper/sqlite3_setup'
 require 'database_cleaner/data_mapper/truncation'
 
-module DataMapper
-  module ConnectionAdapters
-    describe do
-      before(:all) { DataMapperSQLite3Helper.data_mapper_sqlite3_setup }
+describe DatabaseCleaner::DataMapper::Truncation do
+  let(:helper) { DataMapperSQLite3Helper.new }
 
-      let(:adapter) { DataMapperSQLite3Adapter }
+  let(:connection) do
+    helper.data_mapper_sqlite3_connection
+  end
 
-      let(:connection) do
-        DataMapperSQLite3Helper.data_mapper_sqlite3_connection
+  around do |example|
+    helper.data_mapper_sqlite3_setup
+
+    example.run
+
+    helper.data_mapper_sqlite3_teardown
+  end
+
+  describe "DM connection adapter monkeypatches" do
+    describe "#truncate_table" do
+      it "truncates the table" do
+        2.times { DmUser.create }
+
+        connection.truncate_table(DmUser.storage_names[:default])
+        expect(DmUser.count).to eq 0
       end
 
-      before(:each) do
-        connection.truncate_tables(DataMapper::Model.descendants.map { |d| d.storage_names[:default] || d.name.underscore })
-      end
+      it "resets AUTO_INCREMENT index of table" do
+        2.times { DmUser.create }
+        DmUser.destroy
 
-      describe "#truncate_table" do
-        it "truncates the table" do
-          2.times { DmUser.create }
+        connection.truncate_table(DmUser.storage_names[:default])
 
-          connection.truncate_table(DmUser.storage_names[:default])
-          expect(DmUser.count).to eq 0
-        end
-
-        it "resets AUTO_INCREMENT index of table" do
-          2.times { DmUser.create }
-          DmUser.destroy
-
-          connection.truncate_table(DmUser.storage_names[:default])
-
-          expect(DmUser.create.id).to eq 1
-        end
+        expect(DmUser.create.id).to eq 1
       end
     end
   end
diff --git a/spec/database_cleaner/neo4j/transaction_spec.rb b/spec/database_cleaner/neo4j/transaction_spec.rb
index e567f13..d0b213b 100644
--- a/spec/database_cleaner/neo4j/transaction_spec.rb
+++ b/spec/database_cleaner/neo4j/transaction_spec.rb
@@ -1,5 +1,6 @@
 require 'neo4j-core'
 require 'database_cleaner/neo4j/transaction'
+require 'database_cleaner/shared_strategy'
 
 module DatabaseCleaner
   module Neo4j
diff --git a/spec/database_cleaner/ohm/truncation_spec.rb b/spec/database_cleaner/ohm/truncation_spec.rb
index 7ec4ebd..9712ea0 100644
--- a/spec/database_cleaner/ohm/truncation_spec.rb
+++ b/spec/database_cleaner/ohm/truncation_spec.rb
@@ -1,69 +1,54 @@
 require 'ohm'
 require 'database_cleaner/ohm/truncation'
 
-module DatabaseCleaner
-  module Ohm
+module OhmTests
+  class Widget < ::Ohm::Model
+    attribute :name
+  end
 
-    class Widget < ::Ohm::Model
-      attribute :name
+  class Gadget < ::Ohm::Model
+    attribute :name
+  end
+end
+
+describe DatabaseCleaner::Ohm::Truncation do
+  around do |example|
+    config = YAML::load(File.open("#{File.dirname(__FILE__)}/../../../examples/config/redis.yml"))
+    Ohm.connect url: config['test']['url']
+    @redis = Ohm.redis
+
+    example.run
+
+    @redis.flushdb
+  end
+
+  before do
+    OhmTests::Widget.new(name: 'some widget').save
+    OhmTests::Gadget.new(name: 'some gadget').save
+  end
+
+  context "by default" do
+    it "truncates all keys" do
+      expect { subject.clean }.to change { @redis.keys.size }.from(6).to(0)
     end
+  end
 
-    class Gadget < ::Ohm::Model
-      attribute :name
+  context "when keys are provided to the :only option" do
+    subject { described_class.new(only: ['*Widget*']) }
+
+    it "only truncates the specified keys" do
+      expect { subject.clean }.to change { @redis.keys.size }.from(6).to(3)
+      expect(@redis.get('OhmTests::Gadget:id')).to eq '1'
     end
+  end
 
-    describe Truncation do
-      before(:all) do
-        config = YAML::load(File.open("#{File.dirname(__FILE__)}/../../../examples/config/redis.yml"))
-        ::Ohm.connect :url => config['test']['url']
-        @redis = ::Ohm.redis
-      end
+  context "when keys are provided to the :except option" do
+    subject { described_class.new(except: ['*Widget*']) }
 
-      before(:each) do
-        @redis.flushdb
-      end
-
-      it "should flush the database" do
-        Truncation.new.clean
-      end
-
-      def create_widget(attrs={})
-        Widget.new({:name => 'some widget'}.merge(attrs)).save
-      end
-
-      def create_gadget(attrs={})
-        Gadget.new({:name => 'some gadget'}.merge(attrs)).save
-      end
-
-      it "truncates all keys by default" do
-        create_widget
-        create_gadget
-        expect(@redis.keys.size).to eq 6
-        Truncation.new.clean
-        expect(@redis.keys.size).to eq 0
-      end
-
-      context "when keys are provided to the :only option" do
-        it "only truncates the specified keys" do
-          create_widget
-          create_gadget
-          expect(@redis.keys.size).to eq 6
-          Truncation.new(:only => ['*Widget*']).clean
-          expect(@redis.keys.size).to eq 3
-          expect(@redis.get('DatabaseCleaner::Ohm::Gadget:id')).to eq '1'
-        end
-      end
-
-      context "when keys are provided to the :except option" do
-        it "truncates all but the specified keys" do
-          create_widget
-          create_gadget
-          expect(@redis.keys.size).to eq 6
-          Truncation.new(:except => ['*Widget*']).clean
-          expect(@redis.keys.size).to eq 3
-          expect(@redis.get('DatabaseCleaner::Ohm::Widget:id')).to eq '1'
-        end
-      end
+    it "truncates all but the specified keys" do
+      expect { subject.clean }.to change { @redis.keys.size }.from(6).to(3)
+      expect(@redis.get('OhmTests::Widget:id')).to eq '1'
     end
   end
 end
+
diff --git a/spec/database_cleaner/redis/truncation_spec.rb b/spec/database_cleaner/redis/truncation_spec.rb
index 9899e9d..1b2bcfa 100644
--- a/spec/database_cleaner/redis/truncation_spec.rb
+++ b/spec/database_cleaner/redis/truncation_spec.rb
@@ -1,61 +1,42 @@
 require 'redis'
 require 'database_cleaner/redis/truncation'
 
+describe DatabaseCleaner::Redis::Truncation do
+  around do |example|
+    config = YAML::load(File.open("#{File.dirname(__FILE__)}/../../../examples/config/redis.yml"))
+    @redis = ::Redis.new :url => config['test']['url']
 
-module DatabaseCleaner
-  module Redis
+    example.run
 
-    describe Truncation do
-      before(:all) do
-        config = YAML::load(File.open("#{File.dirname(__FILE__)}/../../../examples/config/redis.yml"))
-      @redis = ::Redis.new :url => config['test']['url']
-      end
+    @redis.flushdb
+  end
 
-      before(:each) do
-        @redis.flushdb
-      end
+  before do
+    @redis.set 'Widget', 1
+    @redis.set 'Gadget', 1
+  end
 
-      it "should flush the database" do
-        Truncation.new.clean
-      end
+  context "by default" do
+    it "truncates all keys" do
+      expect { subject.clean }.to change { @redis.keys.size }.from(2).to(0)
+    end
+  end
 
-      def create_widget(attrs={})
-        @redis.set 'Widget', 1
-      end
+  context "when keys are provided to the :only option" do
+    subject { described_class.new(only: ['Widge*']) }
 
-      def create_gadget(attrs={})
-        @redis.set 'Gadget', 1
-      end
+    it "only truncates the specified keys" do
+      expect { subject.clean }.to change { @redis.keys.size }.from(2).to(1)
+      expect(@redis.get('Gadget')).to eq '1'
+    end
+  end
 
-      it "truncates all keys by default" do
-        create_widget
-        create_gadget
-        expect(@redis.keys.size).to eq 2
-        Truncation.new.clean
-        expect(@redis.keys.size).to eq 0
-      end
+  context "when keys are provided to the :except option" do
+    subject { described_class.new(except: ['Widg*']) }
 
-      context "when keys are provided to the :only option" do
-        it "only truncates the specified keys" do
-          create_widget
-          create_gadget
-          expect(@redis.keys.size).to eq 2
-          Truncation.new(:only => ['Widge*']).clean
-          expect(@redis.keys.size).to eq 1
-          expect(@redis.get('Gadget')).to eq '1'
-        end
-      end
-
-      context "when keys are provided to the :except option" do
-        it "truncates all but the specified keys" do
-          create_widget
-          create_gadget
-          expect(@redis.keys.size).to eq 2
-          Truncation.new(:except => ['Widg*']).clean
-          expect(@redis.keys.size).to eq 1
-          expect(@redis.get('Widget')).to eq '1'
-        end
-      end
+    it "truncates all but the specified keys" do
+      expect { subject.clean }.to change { @redis.keys.size }.from(2).to(1)
+      expect(@redis.get('Widget')).to eq '1'
     end
   end
 end
diff --git a/spec/database_cleaner/sequel/base_spec.rb b/spec/database_cleaner/sequel/base_spec.rb
index b2b3b73..16fa9e9 100644
--- a/spec/database_cleaner/sequel/base_spec.rb
+++ b/spec/database_cleaner/sequel/base_spec.rb
@@ -22,10 +22,6 @@ module DatabaseCleaner
         expect(subject.db).to eq :my_db
       end
 
-      it "should default to :default" do
-        expect(subject.db).to eq :default
-      end
-
       pending "I figure out how to use Sequel and write some real tests for it..."
     end
   end
diff --git a/spec/database_cleaner/sequel/deletion_spec.rb b/spec/database_cleaner/sequel/deletion_spec.rb
index 08cfade..e5255e6 100644
--- a/spec/database_cleaner/sequel/deletion_spec.rb
+++ b/spec/database_cleaner/sequel/deletion_spec.rb
@@ -1,6 +1,8 @@
 require 'database_cleaner/sequel/deletion'
 require 'database_cleaner/shared_strategy'
 require 'sequel'
+require 'support/sequel/sequel_setup'
+# XXX: use ActiveRecord's db_config (`db/config.yml`) for CI/dev convenience
 require 'support/active_record/database_setup'
 
 module DatabaseCleaner
@@ -43,13 +45,22 @@ module DatabaseCleaner
 
     supported_configurations = [
       { :url => 'mysql:///', :connection_options => db_config['mysql'] },
-      { :url => 'postgres:///', :connection_options => db_config['postgres'] }
+      { :url => 'postgres:///', :connection_options => db_config['postgres'] },
     ]
 
     supported_configurations.each do |config|
       describe "Sequel deletion (using a #{config[:url]} connection)" do
         let(:db) { ::Sequel.connect(config[:url], config[:connection_options]) }
 
+        around do |example|
+          helper = SequelHelper.new(config)
+          helper.setup
+
+          example.run
+
+          helper.teardown
+        end
+
         it_behaves_like 'a Sequel deletion strategy'
       end
     end
diff --git a/spec/database_cleaner/sequel/truncation_spec.rb b/spec/database_cleaner/sequel/truncation_spec.rb
index 975a42e..4ebdb3f 100644
--- a/spec/database_cleaner/sequel/truncation_spec.rb
+++ b/spec/database_cleaner/sequel/truncation_spec.rb
@@ -1,7 +1,7 @@
 require 'database_cleaner/sequel/truncation'
 require 'database_cleaner/shared_strategy'
 require 'sequel'
-
+require 'support/sequel/sequel_setup'
 # XXX: use ActiveRecord's db_config (`db/config.yml`) for CI/dev convenience
 require 'support/active_record/database_setup'
 
@@ -22,7 +22,7 @@ module DatabaseCleaner
       end
 
       context 'when several tables have data' do
-        before(:each) do
+        before do
           db.create_table!(:precious_stones) { primary_key :id }
           db.create_table!(:replaceable_trifles)  { primary_key :id }
           db.create_table!(:worthless_junk)  { primary_key :id }
@@ -122,13 +122,24 @@ module DatabaseCleaner
       {url: 'mysql:///',    connection_options: db_config['mysql']},
       {url: 'mysql2:///',   connection_options: db_config['mysql2']}
     ]
+
     supported_configurations.each do |config|
       describe "Sequel truncation (using a #{config[:url]} connection)" do
+        around do |example|
+          helper = SequelHelper.new(config)
+          helper.setup
+
+          example.run
+
+          helper.teardown
+        end
+
         let(:db) { ::Sequel.connect(config[:url], config[:connection_options]) }
 
         it_behaves_like 'a Sequel truncation strategy'
         it_behaves_like 'a truncation strategy that resets autoincrement keys by default'
 
+
         describe '#pre_count?' do
           subject { Truncation.new.tap { |t| t.db = db } }
 
@@ -170,8 +181,18 @@ module DatabaseCleaner
         end
       end
     end
+
     half_supported_configurations.each do |config|
       describe "Sequel truncation (using a #{config[:url]} connection)" do
+        around do |example|
+          helper = SequelHelper.new(config)
+          helper.setup
+
+          example.run
+
+          helper.teardown
+        end
+
         let(:db) { ::Sequel.connect(config[:url], config[:connection_options]) }
 
         it_behaves_like 'a Sequel truncation strategy'
diff --git a/spec/support/active_record/mysql2_setup.rb b/spec/support/active_record/mysql2_setup.rb
index 6e76ad6..a180f98 100644
--- a/spec/support/active_record/mysql2_setup.rb
+++ b/spec/support/active_record/mysql2_setup.rb
@@ -1,29 +1,12 @@
 require 'support/active_record/database_setup'
 require 'support/active_record/schema_setup'
 
-module MySQL2Helper
-  extend self
-
+class MySQL2Helper
   puts "Active Record #{ActiveRecord::VERSION::STRING}, mysql2"
 
   # require 'logger'
   # ActiveRecord::Base.logger = Logger.new(STDERR)
 
-  def default_config
-    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 establish_connection(config = default_config)
-    ActiveRecord::Base.establish_connection config
-  end
-
   def active_record_mysql2_setup
     patch_mysql2_adapter
     create_db
@@ -35,6 +18,27 @@ module MySQL2Helper
     ActiveRecord::Base.connection
   end
 
+  def active_record_mysql2_teardown
+    ActiveRecord::Base.connection.drop_database default_config['database']
+  end
+
+  private
+
+  def default_config
+    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 establish_connection(config = default_config)
+    ActiveRecord::Base.establish_connection config
+  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"
diff --git a/spec/support/active_record/mysql_setup.rb b/spec/support/active_record/mysql_setup.rb
index e0ade73..8b99bde 100644
--- a/spec/support/active_record/mysql_setup.rb
+++ b/spec/support/active_record/mysql_setup.rb
@@ -1,38 +1,37 @@
 require 'support/active_record/database_setup'
 require 'support/active_record/schema_setup'
 
-module MySQLHelper
-  extend self
-
+class MySQLHelper
   puts "Active Record #{ActiveRecord::VERSION::STRING}, mysql"
 
   # require 'logger'
   # ActiveRecord::Base.logger = Logger.new(STDERR)
 
+  def active_record_mysql_setup
+    patch_mysql_adapter
+    create_db
+    active_record_load_schema
+  end
+
+  def active_record_mysql_connection
+    ActiveRecord::Base.connection
+  end
+
+  def active_record_mysql_teardown
+    ActiveRecord::Base.connection.drop_database default_config['database']
+  end
+
+  private
+
   def default_config
     db_config['mysql']
   end
 
   def create_db
-    establish_connection(default_config.merge(:database => nil))
-
+    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']
-  end
-
-  def establish_connection(config = default_config)
-    ActiveRecord::Base.establish_connection config
-  end
-
-  def active_record_mysql_setup
-    patch_mysql_adapter
-    create_db
-    establish_connection
-    active_record_load_schema
-  end
-
-  def active_record_mysql_connection
-    ActiveRecord::Base.connection
+    ActiveRecord::Base.establish_connection default_config
   end
 
   def patch_mysql_adapter
diff --git a/spec/support/active_record/postgresql_setup.rb b/spec/support/active_record/postgresql_setup.rb
index fb851ef..a3c4438 100644
--- a/spec/support/active_record/postgresql_setup.rb
+++ b/spec/support/active_record/postgresql_setup.rb
@@ -1,33 +1,11 @@
 require 'support/active_record/database_setup'
 require 'support/active_record/schema_setup'
 
-module PostgreSQLHelper
-  extend self
-
+class PostgreSQLHelper
   puts "Active Record #{ActiveRecord::VERSION::STRING}, pg"
 
   # ActiveRecord::Base.logger = Logger.new(STDERR)
 
-  def default_config
-    db_config['postgres']
-  end
-
-  def create_db
-    @encoding = default_config['encoding'] || ENV['CHARSET'] || 'utf8'
-    begin
-      establish_connection(default_config.merge('database' => 'postgres', 'schema_search_path' => 'public'))
-      ActiveRecord::Base.connection.drop_database(default_config['database']) rescue nil
-      ActiveRecord::Base.connection.create_database(default_config['database'], default_config.merge('encoding' => @encoding))
-    rescue Exception => e
-      $stderr.puts e, *(e.backtrace)
-      $stderr.puts "Couldn't create database for #{default_config.inspect}"
-    end
-  end
-
-  def establish_connection(config = default_config)
-    ActiveRecord::Base.establish_connection(config)
-  end
-
   def active_record_pg_setup
     create_db
     establish_connection
@@ -35,13 +13,33 @@ module PostgreSQLHelper
   end
 
   def active_record_pg_migrate
-    create_db
-    establish_connection
     ActiveRecord::Migrator.migrate 'spec/support/active_record/migrations'
   end
 
   def active_record_pg_connection
     ActiveRecord::Base.connection
   end
+
+  def active_record_pg_teardown
+    ActiveRecord::Base.connection.execute "DROP TABLE users, agents;"
+  rescue ActiveRecord::StatementInvalid
+  end
+
+  private
+
+  def default_config
+    db_config['postgres']
+  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))
+  rescue ActiveRecord::StatementInvalid
+  end
+
+  def establish_connection(config = default_config)
+    ActiveRecord::Base.establish_connection(config)
+  end
 end
 
diff --git a/spec/support/active_record/sqlite3_setup.rb b/spec/support/active_record/sqlite3_setup.rb
index 8047c83..325e1dd 100644
--- a/spec/support/active_record/sqlite3_setup.rb
+++ b/spec/support/active_record/sqlite3_setup.rb
@@ -1,31 +1,11 @@
 require 'support/active_record/database_setup'
 require 'support/active_record/schema_setup'
 
-module SQLite3Helper
-  extend self
-
+class SQLite3Helper
   puts "Active Record #{ActiveRecord::VERSION::STRING}, sqlite3"
 
   # ActiveRecord::Base.logger = Logger.new(STDERR)
 
-  def default_config
-    db_config['sqlite3']
-  end
-
-  def create_db
-    @encoding = default_config['encoding'] || ENV['CHARSET'] || 'utf8'
-    begin
-      establish_connection(default_config.merge('database' => 'sqlite3', 'schema_search_path' => 'public'))
-    rescue Exception => e
-      $stderr.puts e, *(e.backtrace)
-      $stderr.puts "Couldn't create database for #{default_config.inspect}"
-    end
-  end
-
-  def establish_connection(config = default_config)
-    ActiveRecord::Base.establish_connection(config)
-  end
-
   def active_record_sqlite3_setup
     create_db
     establish_connection
@@ -35,5 +15,25 @@ module SQLite3Helper
   def active_record_sqlite3_connection
     ActiveRecord::Base.connection
   end
+
+  def active_record_sqlite3_teardown
+    ActiveRecord::Base.connection.truncate_table('users')
+    ActiveRecord::Base.connection.truncate_table('agents')
+  end
+
+  private
+
+  def default_config
+    db_config['sqlite3']
+  end
+
+  def create_db
+    @encoding = default_config['encoding'] || ENV['CHARSET'] || 'utf8'
+    establish_connection(default_config.merge('database' => 'sqlite3', 'schema_search_path' => 'public'))
+  end
+
+  def establish_connection(config = default_config)
+    ActiveRecord::Base.establish_connection(config)
+  end
 end
 
diff --git a/spec/support/data_mapper/sqlite3_setup.rb b/spec/support/data_mapper/sqlite3_setup.rb
index 98b29be..32ef78a 100644
--- a/spec/support/data_mapper/sqlite3_setup.rb
+++ b/spec/support/data_mapper/sqlite3_setup.rb
@@ -1,29 +1,9 @@
 require 'support/active_record/database_setup'
 require 'support/data_mapper/schema_setup'
 
-module DataMapperSQLite3Helper
-  extend self
-
+class DataMapperSQLite3Helper
   puts "DataMapper #{DataMapper::VERSION}, sqlite3"
 
-  def default_config
-    db_config['sqlite3']
-  end
-
-  def create_db
-    @encoding = default_config['encoding'] || ENV['CHARSET'] || 'utf8'
-    begin
-      establish_connection(default_config.merge('database' => 'sqlite3', 'schema_search_path' => 'public'))
-    rescue Exception => e
-      $stderr.puts e, *(e.backtrace)
-      $stderr.puts "Couldn't create database for #{default_config.inspect}"
-    end
-  end
-
-  def establish_connection(config = default_config)
-    DataMapper.setup(:default, config)
-  end
-
   def data_mapper_sqlite3_setup
     create_db
     establish_connection
@@ -33,5 +13,24 @@ module DataMapperSQLite3Helper
   def data_mapper_sqlite3_connection
     DataMapper.repository.adapter
   end
+
+  def data_mapper_sqlite3_teardown
+    DataMapper.repository.adapter.truncate_tables(DataMapper::Model.descendants.map { |d| d.storage_names[:default] || d.name.underscore })
+  end
+
+  private
+
+  def default_config
+    db_config['sqlite3']
+  end
+
+  def create_db
+    @encoding = default_config['encoding'] || ENV['CHARSET'] || 'utf8'
+    establish_connection(default_config.merge('database' => 'sqlite3', 'schema_search_path' => 'public'))
+  end
+
+  def establish_connection(config = default_config)
+    DataMapper.setup(:default, config)
+  end
 end
 
diff --git a/spec/support/sequel/sequel_setup.rb b/spec/support/sequel/sequel_setup.rb
new file mode 100644
index 0000000..3694252
--- /dev/null
+++ b/spec/support/sequel/sequel_setup.rb
@@ -0,0 +1,38 @@
+class SequelHelper < Struct.new(:config)
+  def setup
+    if config[:url] == "postgres:///" || config[:url] == "sqlite:///"
+      ::Sequel.connect(config[:url], config[:connection_options].merge('database' => 'postgres')) do |db|
+        begin
+          db.execute "CREATE DATABASE #{database}"
+        rescue ::Sequel::DatabaseError
+        end
+      end
+    else
+      ::Sequel.connect(config[:url], config[:connection_options].merge('database' => nil)) do |db|
+        db.execute "DROP DATABASE IF EXISTS #{database}"
+        db.execute "CREATE DATABASE #{database}"
+      end
+    end
+  end
+
+  def teardown
+    if config[:url] == "postgres:///" || config[:url] == "sqlite:///"
+      ::Sequel.connect(config[:url], config[:connection_options]) do |db|
+        db.execute "DROP TABLE IF EXISTS precious_stones"
+        db.execute "DROP TABLE IF EXISTS replaceable_trifles"
+        db.execute "DROP TABLE IF EXISTS worthless_junk"
+      end
+    else
+      ::Sequel.connect(config[:url], config[:connection_options].merge('database' => nil)) do |db|
+        db.execute "DROP DATABASE IF EXISTS #{database}"
+      end
+    end
+  rescue SQLite3::BusyException
+  end
+
+  private
+
+  def database
+    config[:connection_options]['database']
+  end
+end