fix datamapper sqlite adapter truncation

lib/database_cleaner/data_mapper/truncation.rb

@@ -12,7 +12,7 @@ module DataMapper
 
       def truncate_tables(table_names)
         table_names.each do |table_name|
-          adapter.truncate_table table_name
+          truncate_table table_name
         end
       end
 

spec/database_cleaner/data_mapper/truncation/sqlite3_spec.rb

@@ -0,0 +1,43 @@
+require 'spec_helper'
+require 'dm-core'
+require 'dm-sqlite-adapter'
+require File.expand_path('../../../../support/data_mapper/sqlite3_setup', __FILE__)
+require 'database_cleaner/data_mapper/truncation'
+
+module DataMapper
+  module ConnectionAdapters
+    describe do
+      before(:all) { data_mapper_sqlite3_setup }
+
+      let(:adapter) { DataMapperSQLite3Adapter }
+
+      let(:connection) do
+        data_mapper_sqlite3_connection
+      end
+
+      before(:each) do
+        connection.truncate_tables ['users']
+      end
+
+      describe "#truncate_table" do
+        it "truncates the table" do
+          2.times { User.create }
+
+          connection.truncate_table('users')
+          User.count.should eq 0
+        end
+
+        it "resets AUTO_INCREMENT index of table" do
+          2.times { User.create }
+          User.destroy
+
+          connection.truncate_table('users')
+
+          User.create.id.should eq 1
+        end
+      end
+
+    end
+  end
+end
+

spec/support/data_mapper/schema_setup.rb

@@ -0,0 +1,13 @@
+def load_schema
+  require 'dm-migrations'
+
+  DataMapper.auto_migrate!
+end
+
+class ::User
+  include DataMapper::Resource
+
+  property :id, Serial
+  property :name, String
+
+end

spec/support/data_mapper/sqlite3_setup.rb

@@ -0,0 +1,38 @@
+require 'support/active_record/database_setup'
+require 'support/data_mapper/schema_setup'
+
+module DataMapperSQLite3Helper
+  puts "DataMapper #{DataMapper::VERSION}, sqlite3"
+
+  def config
+    db_config['sqlite3']
+  end
+
+  def create_db
+    @encoding = config['encoding'] || ENV['CHARSET'] || 'utf8'
+    begin
+      establish_connection(config.merge('database' => 'sqlite3', 'schema_search_path' => 'public'))
+    rescue Exception => e
+      $stderr.puts e, *(e.backtrace)
+      $stderr.puts "Couldn't create database for #{config.inspect}"
+    end
+  end
+
+  def establish_connection(config = config)
+    DataMapper.setup(:default, config)
+  end
+
+  def data_mapper_sqlite3_setup
+    create_db
+    establish_connection
+    load_schema
+  end
+
+  def data_mapper_sqlite3_connection
+    DataMapper.repository.adapter
+  end
+end
+
+RSpec.configure do |c|
+  c.include(DataMapperSQLite3Helper)
+end