initial work done. Have failing example feauture and main config module done.

examples/features/example.feature

@@ -0,0 +1,11 @@
+Feature: example
+ In order to test DataBase Cleaner
+ Here are some scenarios that rely on the DB being clean!
+
+  Scenario: dirty the db
+    When I create a widget
+    Then I should see 1 widget
+
+  Scenario: assume a clean db
+    When I create a widget
+    Then I should see 1 widget

examples/features/step_definitions/example_steps.rb

@@ -0,0 +1,8 @@
+When /^I create a widget$/ do
+  Widget.create!
+end
+
+Then /^I should see 1 widget$/ do
+  Widget.count.should == 1
+end
+

examples/features/support/env.rb

@@ -0,0 +1,19 @@
+require 'rubygems'
+require 'spec/expectations'
+
+require 'activerecord'
+require '../../lib/database_cleaner'
+require 'database_cleaner/cucumber'
+
+DatabaseCleaner.strategy = :transaction #DatabaseCleaner::ActiveRecord::Transaction.new
+
+ActiveRecord::Base.establish_connection(:adapter => "sqlite3", :dbfile => ":memory:")
+
+ActiveRecord::Schema.define(:version => 1) do
+  create_table :widgets do |t|
+    t.string :name
+  end
+end
+
+class Widget < ActiveRecord::Base
+end

lib/database_cleaner.rb

@@ -0,0 +1,2 @@
+$LOAD_PATH.unshift(File.expand_path(File.dirname(__FILE__))) unless $LOAD_PATH.include?(File.expand_path(File.dirname(__FILE__)))
+require 'database_cleaner/configuration'

lib/database_cleaner/active_record/transaction.rb

@@ -0,0 +1,6 @@
+module DatabaseCleaner::ActiveRecord
+  class Transaction
+
+  end
+
+end

lib/database_cleaner/configuration.rb

@@ -0,0 +1,66 @@
+module DatabaseCleaner
+ 
+  class NoStrategySetError < StandardError;   end
+  class NoORMDetected < StandardError;   end
+  class UnknownStrategySpecified < ArgumentError;   end
+
+  class << self
+    def strategy=(args)
+      strategy, *strategy_args = args
+       if strategy.is_a?(Symbol)
+          @strategy = orm_strategy(strategy).new(*strategy_args)
+       else
+        raise UnknownStrategySpecified, "need good error message"
+       end
+    end
+
+    def clear_strategy
+      @strategy = nil
+    end
+
+    def start
+      strategy.start
+    end
+
+    def clean
+      strategy.clean
+    end
+
+    private
+
+    def strategy
+      return @strategy if @strategy
+      raise NoStrategySetError, "Please set a strategy with DatabaseCleaner.strategy=."
+    end
+
+    def orm_strategy(strategy)
+      require "database_cleaner/#{orm}/#{strategy}"
+      orm_module.const_get(strategy.to_s.capitalize)
+    rescue LoadError => e
+      raise UnknownStrategySpecified, "foo"
+    end
+
+
+    def orm
+      if defined? ::ActiveRecord
+        'active_record'
+      elsif defined? ::DataMapper
+        'data_mapper'
+      else
+        raise NoORMDetected, "No known ORM was detected!  Is ActiveRecord or DataMapper loaded?"
+      end
+    end
+
+
+    def orm_module
+      case orm
+      when 'active_record'
+        DatabaseCleaner::ActiveRecord
+      when 'data_mapper'
+        DatabaseCleaner::DataMapper
+      end
+    end
+
+  end
+
+end

lib/database_cleaner/cucumber.rb

@@ -0,0 +1,8 @@
+
+Before do
+  DatabaseCleaner.start
+end
+
+After do
+  DatabaseCleaner.clean
+end

lib/database_cleaner/data_mapper/transaction.rb

@@ -0,0 +1,6 @@
+module DatabaseCleaner::DataMapper
+  class Transaction
+
+  end
+
+end

spec/database_cleaner/configuration_spec.rb

@@ -0,0 +1,54 @@
+require File.dirname(__FILE__) + '/../spec_helper'
+require 'database_cleaner/active_record/transaction'
+require 'database_cleaner/data_mapper/transaction'
+
+describe DatabaseCleaner do
+  before(:each) do
+    DatabaseCleaner::ActiveRecord::Transaction.stub!(:new).and_return(@strategy = mock('strategy'))
+    Object.const_set('ActiveRecord', "just mocking out the constant here...") unless defined?(::ActiveRecord)
+    DatabaseCleaner.clear_strategy
+  end
+
+  describe ".strategy=" do
+    it "should initialize the appropirate strategy based on the ORM adapter detected" do
+      DatabaseCleaner::ActiveRecord::Transaction.should_receive(:new).with('options' => 'hash')
+      DatabaseCleaner.strategy = :transaction, {'options' => 'hash'}
+
+      Object.send(:remove_const, 'ActiveRecord')
+      Object.const_set('DataMapper', "just mocking out the constant here...")
+
+      DatabaseCleaner::DataMapper::Transaction.should_receive(:new).with(no_args)
+      DatabaseCleaner.strategy = :transaction
+    end
+
+    it "should raise an error when no ORM is detected" do
+      Object.send(:remove_const, 'ActiveRecord') if defined?(::ActiveRecord)
+      Object.send(:remove_const, 'DataMapper') if defined?(::DataMapper)
+
+      running { DatabaseCleaner.strategy = :transaction }.should raise_error(DatabaseCleaner::NoORMDetected)
+    end
+
+    it "should raise an error when the specified strategy is not found" do
+      running { DatabaseCleaner.strategy = :foo }.should raise_error(DatabaseCleaner::UnknownStrategySpecified)
+      running { DatabaseCleaner.strategy = Array }.should raise_error(DatabaseCleaner::UnknownStrategySpecified)
+    end
+
+  end
+
+
+    %w[start clean].each do |strategy_method|
+      describe ".#{strategy_method}" do
+        it "should be delgated to the strategy set with strategy=" do
+          DatabaseCleaner.strategy = :transaction
+
+          @strategy.should_receive(strategy_method)
+
+          DatabaseCleaner.send(strategy_method)
+        end
+
+        it "should raise en error when no strategy has been set" do
+          running { DatabaseCleaner.send(strategy_method) }.should raise_error(DatabaseCleaner::NoStrategySetError)
+        end
+      end
+    end
+end

spec/database_cleaner_spec.rb

@@ -1,7 +0,0 @@
-require File.dirname(__FILE__) + '/spec_helper'
-
-describe "DatabaseCleaner" do
-  it "fails" do
-    fail "hey buddy, you should probably rename this file and start specing for real"
-  end
-end

spec/spec.opts

@@ -0,0 +1,5 @@
+--colour
+--format nested
+--loadby
+mtime
+--reverse

spec/spec_helper.rb

@@ -1,9 +1,11 @@
+require 'rubygems'
 require 'spec'
 
-$LOAD_PATH.unshift(File.dirname(__FILE__))
-
+$:.unshift(File.dirname(__FILE__) + '/../lib')
 require 'database_cleaner'
 
 Spec::Runner.configure do |config|
   
 end
+
+alias running lambda