Added a test helper to build models/database tables for testing matchers

test/model_builder.rb

@@ -0,0 +1,41 @@
+class Test::Unit::TestCase
+  def build_model_class(name, columns = {}, &block)
+    class_name = name.to_s.pluralize.classify
+    table_name = class_name.tableize
+    connection = ActiveRecord::Base.connection
+    
+    begin
+      connection.execute("DROP TABLE IF EXISTS #{table_name}")
+      connection.create_table table_name do |t|
+        columns.each do |name, type|
+          t.column name, type
+        end
+      end
+    rescue Exception => e
+      connection.execute("DROP TABLE #{table_name}")
+      raise e
+    end
+
+    klass = Class.new(ActiveRecord::Base)
+    Object.const_set(class_name, klass)
+
+    klass.class_eval(&block) if block_given?
+
+    @built_models ||= []
+    @built_models << klass
+
+    klass
+  end
+
+  def teardown_with_models
+    if @built_models
+      @built_models.each do |klass| 
+        ActiveRecord::Base.connection.execute("DROP TABLE #{klass.table_name}")
+        Object.send(:remove_const, klass.name)
+      end
+    end
+    teardown_without_models
+  end
+  alias_method :teardown_without_models, :teardown
+  alias_method :teardown, :teardown_with_models
+end

test/test_helper.rb

@@ -31,3 +31,4 @@ class Test::Unit::TestCase #:nodoc:
 end
 
 require 'test/fail_macros'
+require 'test/model_builder'