Added migration support and adapter name.

lib/active_record/connection_adapters/nulldb_adapter.rb

@@ -23,6 +23,14 @@ def initialize
     super(nil, @logger)
   end
 
+  def adapter_name
+    "NullDB"
+  end
+
+  def supports_migrations?
+    true
+  end
+
   def create_table(table_name, options = {})
     table_definition = ActiveRecord::ConnectionAdapters::TableDefinition.new(self)
     unless options[:id] == false

spec/nulldb_spec.rb

@@ -80,6 +80,14 @@ def on_save_finished
       (exec_count + 1)
   end
 
+  it "should have the adapter name 'NullDB'" do
+    @employee.connection.adapter_name.should == "NullDB"
+  end
+
+  it "should support migrations" do
+    @employee.connection.supports_migrations?.should be_true
+  end
+
   def should_have_column(klass, col_name, col_type)
     col = klass.columns_hash[col_name.to_s]
     col.should_not be_nil