added DatabaseCleaner() method to return a strategy

lib/database_cleaner.rb

@@ -1,2 +1,6 @@
 $LOAD_PATH.unshift(File.expand_path(File.dirname(__FILE__))) unless $LOAD_PATH.include?(File.expand_path(File.dirname(__FILE__)))
 require 'database_cleaner/configuration'
+
+def DatabaseCleaner(*args)
+  DatabaseCleaner.create_strategy(*args)
+end

lib/database_cleaner/configuration.rb

@@ -17,12 +17,20 @@ module DatabaseCleaner
   end
 
   class << self
+
+    def create_strategy(*args)
+      strategy, *strategy_args = args
+      orm_strategy(strategy).new(*strategy_args)
+    end
+
     def strategy=(args)
       strategy, *strategy_args = args
        if strategy.is_a?(Symbol)
-          @strategy = orm_strategy(strategy).new(*strategy_args)
-       else
+          @strategy = create_strategy(*args)
+       elsif strategy_args.empty?
          @strategy = strategy
+       else
+         raise ArgumentError, "You must provide a strategy object, or a symbol for a know strategy along with initialization params."
        end
     end
 

spec/database_cleaner/configuration_spec.rb

@@ -10,6 +10,7 @@ describe DatabaseCleaner do
     # need to add one for each ORM that we load in the spec helper...
   end
   after(:all) do
+    Object.send(:remove_const, 'ActiveRecord') if defined?(::ActiveRecord) #want to make sure we have the real one...
     ActiveRecord = TempAR
   end
 
@@ -20,6 +21,15 @@ describe DatabaseCleaner do
     DatabaseCleaner.orm = nil
   end
 
+  describe ".create_strategy ( DatabaseCleaner() )" do
+    it "should initialize and return the appropirate strategy based on the ORM adapter detected" do
+      DatabaseCleaner::ActiveRecord::Transaction.should_receive(:new).with('options' => 'hash')
+      result = DatabaseCleaner(:transaction, {'options' => 'hash'})
+
+      result.should == @strategy
+    end
+  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')
@@ -47,6 +57,10 @@ describe DatabaseCleaner do
       DatabaseCleaner.strategy = :transaction
     end
 
+    it "should raise an error when multiple args is passed in and the first is not a symbol" do
+      running { DatabaseCleaner.strategy=Object.new, {:foo => 'bar'} }.should raise_error(ArgumentError)
+    end
+
     it "should raise an error when the specified strategy is not found" do
       running { DatabaseCleaner.strategy = :foo }.should raise_error(DatabaseCleaner::UnknownStrategySpecified)
     end