A beginning of sorts.

Minimal implementation that supports db:create SQLite replacement

activerecord/lib/active_record.rb

@@ -137,6 +137,12 @@ module Scoping
     end
   end
 
+  module Tasks
+    extend ActiveSupport::Autoload
+
+    autoload :DatabaseTasks
+  end
+
   autoload :TestCase
   autoload :TestFixtures, 'active_record/fixtures'
 end

activerecord/lib/active_record/railties/databases.rake

@@ -50,18 +50,7 @@ db_namespace = namespace :db do
   def create_database(config)
     begin
       if config['adapter'] =~ /sqlite/
-        if File.exist?(config['database'])
-          $stderr.puts "#{config['database']} already exists"
-        else
-          begin
-            # Create the SQLite database
-            ActiveRecord::Base.establish_connection(config)
-            ActiveRecord::Base.connection
-          rescue Exception => e
-            $stderr.puts e, *(e.backtrace)
-            $stderr.puts "Couldn't create database for #{config.inspect}"
-          end
-        end
+        ActiveRecord::Tasks::DatabaseTasks.create config
         return # Skip the else clause of begin/rescue
       else
         ActiveRecord::Base.establish_connection(config)

activerecord/lib/active_record/tasks/database_tasks.rb

+class ActiveRecord::Tasks::DatabaseTasks
+  def self.create(configuration)
+    if File.exist?(configuration['database'])
+      $stderr.puts "#{configuration['database']} already exists"
+      return
+    end
+
+    ActiveRecord::Base.establish_connection(configuration)
+    ActiveRecord::Base.connection
+  rescue Exception => e
+    $stderr.puts e, *(e.backtrace)
+    $stderr.puts "Couldn't create database for #{configuration.inspect}"
+  end
+end

activerecord/test/cases/sqlite_rake_test.rb

+require 'cases/helper'
+
+module ActiveRecord
+  class SqliteRakeTest < ActiveRecord::TestCase
+    def setup
+      @database      = "db_create.sqlite3"
+      @connection    = stub :connection
+      @configuration = {
+        'adapter'  => 'sqlite3',
+        'database' => @database
+      }
+
+      File.stubs(:exist?).returns(false)
+      ActiveRecord::Base.stubs(:connection).returns(@connection)
+      ActiveRecord::Base.stubs(:establish_connection).returns(true)
+    end
+
+    def test_db_checks_database_exists
+      File.expects(:exist?).with(@database).returns(false)
+
+      ActiveRecord::Tasks::DatabaseTasks.create @configuration
+    end
+
+    def test_db_create_when_file_exists
+      File.stubs(:exist?).returns(true)
+
+      $stderr.expects(:puts).with("#{@database} already exists")
+
+      ActiveRecord::Tasks::DatabaseTasks.create @configuration
+    end
+
+    def test_db_create_establishes_a_connection
+      ActiveRecord::Base.expects(:establish_connection).with(@configuration)
+
+      ActiveRecord::Tasks::DatabaseTasks.create @configuration
+    end
+
+    def test_db_create_returns_the_connection
+      assert_equal ActiveRecord::Tasks::DatabaseTasks.create(@configuration),
+        @connection
+    end
+
+    def test_db_create_with_error_prints_message
+      ActiveRecord::Base.stubs(:establish_connection).raises(Exception)
+
+      $stderr.stubs(:puts).returns(true)
+      $stderr.expects(:puts).
+        with("Couldn't create database for #{@configuration.inspect}")
+
+      ActiveRecord::Tasks::DatabaseTasks.create(@configuration)
+    end
+  end
+end