diff --git a/spec/database_cleaner/base_spec.rb b/spec/database_cleaner/base_spec.rb
index 78bb123..ed2424b 100644
--- a/spec/database_cleaner/base_spec.rb
+++ b/spec/database_cleaner/base_spec.rb
@@ -42,6 +42,7 @@ module DatabaseCleaner
          ::MongoMapper  = Temp_MM if defined? Temp_MM
          ::Mongoid      = Temp_MO if defined? Temp_MO
          ::CouchPotato  = Temp_CP if defined? Temp_CP
+         ::Sequel       = Temp_SQ if defined? Temp_SQ
          ::Moped        = Temp_MP if defined? Temp_MP
          ::Ohm          = Temp_OH if defined? Temp_OH
          ::Redis        = Temp_RS if defined? Temp_RS
@@ -542,6 +543,11 @@ module DatabaseCleaner
         cleaner.strategy.should be_instance_of DatabaseCleaner::CouchPotato::Truncation
       end
 
+      it 'sets strategy to :transaction for Sequel' do
+        cleaner = DatabaseCleaner::Base.new(:sequel)
+        cleaner.strategy.should be_instance_of DatabaseCleaner::Sequel::Transaction
+      end
+
       it 'sets strategy to :truncation for Moped' do
         cleaner = DatabaseCleaner::Base.new(:moped)
         cleaner.strategy.should be_instance_of DatabaseCleaner::Moped::Truncation
diff --git a/spec/database_cleaner/sequel/truncation/sqlite3_spec.rb b/spec/database_cleaner/sequel/truncation/sqlite3_spec.rb
new file mode 100644
index 0000000..e69de29
diff --git a/spec/database_cleaner/sequel/truncation_spec.rb b/spec/database_cleaner/sequel/truncation_spec.rb
index 1552265..7219776 100644
--- a/spec/database_cleaner/sequel/truncation_spec.rb
+++ b/spec/database_cleaner/sequel/truncation_spec.rb
@@ -3,11 +3,142 @@ require 'database_cleaner/sequel/truncation'
 require 'database_cleaner/shared_strategy'
 require 'sequel'
 
+# XXX: use ActiveRecord's db_config (`db/config.yml`) for CI/dev convenience
+require 'support/active_record/database_setup'
+
 module DatabaseCleaner
   module Sequel
     describe Truncation do
       it_should_behave_like "a generic strategy"
       it_should_behave_like "a generic truncation strategy"
     end
+
+    shared_examples 'a Sequel truncation strategy' do
+
+      # XXX: it'd be really nice if Truncation accepted db: constructor parameter
+      let(:truncation) do
+        t = Truncation.new
+        t.db = db
+        t
+      end
+
+      context 'when several tables have data' do
+        before(:each) 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 }
+
+          db[:precious_stones].insert
+          db[:replaceable_trifles].insert
+          db[:worthless_junk].insert
+        end
+        context 'by default' do
+          it 'truncates all the tables' do
+            t = Truncation.new
+            t.db = db
+            t.clean
+
+            expect(db[:replaceable_trifles]).to have(0).rows
+            expect(db[:worthless_junk]).to have(0).rows
+            expect(db[:precious_stones]).to have(0).rows
+          end
+        end
+        context 'when the Truncation is restricted to "only: [...]" some tables' do
+          it 'truncates only the mentioned tables (and leaves the rest alone)' do
+            t = Truncation.new(only: ['worthless_junk', 'replaceable_trifles'])
+            t.db = db
+            t.clean
+
+            expect(db[:replaceable_trifles]).to have(0).rows
+            expect(db[:worthless_junk]).to have(0).rows
+            expect(db[:precious_stones]).to have(1).rows
+          end
+        end
+        context 'when the Truncation is restricted to "except: [...]" some tables' do
+          it 'leaves the mentioned tables alone (and truncates the rest)' do
+            t = Truncation.new(except: ['precious_stones']) # XXX: Strings only, symbols are ignored
+            t.db = db
+            t.clean
+
+            expect(db[:replaceable_trifles]).to be_empty
+            expect(db[:worthless_junk]).to be_empty
+            expect(db[:precious_stones]).to have(1).item
+          end
+        end
+      end
+    end
+
+    shared_examples_for 'a truncation strategy without autoincrement resets' do
+      it "leaves AUTO_INCREMENT index alone by default (BUG: it should be reset instead)" do
+        # Jordan Hollinger made everything reset auto increment IDs
+        # in commit 6a0104382647e5c06578aeac586c0333c8944492 so I'm pretty sure
+        # everything is meant to reset by default.
+        #
+        # For Postgres, db[:mytable].truncate(restart: true) should work.
+        # For SQLite, db[:sqlite_sequence].where(name: 'mytable').delete
+
+        db.create_table!(:replaceable_trifles) { primary_key :id }
+        table = db[:replaceable_trifles]
+        2.times { table.insert }
+
+        truncation.clean
+
+        id_after_clean = table.insert
+        pending('the bug being fixed') do
+          expect(id_after_clean).to eq 1
+        end
+      end
+      # XXX: it'd be really nice if Truncation accepted db: constructor parameter
+      let(:truncation) do
+        t = Truncation.new
+        t.db = db
+        t
+      end
+    end
+
+    shared_examples_for 'a truncation strategy that resets autoincrement keys by default' do
+      it "resets AUTO_INCREMENT primary keys" do
+        db.create_table!(:replaceable_trifles) { primary_key :id }
+        table = db[:replaceable_trifles]
+        2.times { table.insert }
+
+        truncation.clean
+
+        id_after_clean = table.insert
+        expect(id_after_clean).to eq 1
+      end
+
+      # XXX: it'd be really nice if Truncation accepted db: constructor parameter
+      let(:truncation) do
+        t = Truncation.new
+        t.db = db
+        t
+      end
+    end
+
+    half_supported_configurations = [
+      {url: 'sqlite:///',   connection_options: db_config['sqlite3']},
+      {url: 'postgres:///', connection_options: db_config['postgres']},
+    ]
+    supported_configurations = [
+      {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
+        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'
+      end
+    end
+    half_supported_configurations.each do |config|
+      describe "Sequel truncation (using a #{config[:url]} connection)" do
+        let(:db) { ::Sequel.connect(config[:url], config[:connection_options]) }
+
+        it_behaves_like 'a Sequel truncation strategy'
+        it_behaves_like 'a truncation strategy without autoincrement resets'
+      end
+    end
   end
 end
diff --git a/spec/support/active_record/database_setup.rb b/spec/support/active_record/database_setup.rb
index 0e358b0..25081b5 100644
--- a/spec/support/active_record/database_setup.rb
+++ b/spec/support/active_record/database_setup.rb
@@ -1,3 +1,5 @@
+require 'yaml'
+
 def db_config
   config_path = 'db/config.yml'
   @db_config ||= YAML.load(IO.read(config_path))