added specs for the migration_generator

.gitignore

@@ -5,3 +5,4 @@
 .rvmrc
 Gemfile.lock
 spec/database.yml
+tmp

acts-as-taggable-on.gemspec

@@ -12,6 +12,7 @@ Gem::Specification.new do |gem|
 
   gem.add_runtime_dependency 'rails'
   gem.add_development_dependency 'rspec', '~> 2.5'
+  gem.add_development_dependency 'ammeter', '~> 0.1.3'
   gem.add_development_dependency 'sqlite3'
   gem.add_development_dependency 'mysql2', '< 0.3'
   gem.add_development_dependency 'pg'

spec/generators/acts_as_taggable_on/migration/migration_generator_spec.rb

@@ -0,0 +1,22 @@
+require 'spec_helper'
+
+# Generators are not automatically loaded by Rails
+require 'generators/acts_as_taggable_on/migration/migration_generator'
+
+describe ActsAsTaggableOn::MigrationGenerator do
+  # Tell the generator where to put its output (what it thinks of as Rails.root)
+  destination File.expand_path("../../../../../tmp", __FILE__)
+
+  before do
+    prepare_destination
+    Rails::Generators.options[:rails][:orm] = :active_record
+  end
+  describe 'no arguments' do
+    before { run_generator  }
+
+    describe 'db/migrate/acts_as_taggable_on_migration.rb' do
+      subject { file('db/migrate/acts_as_taggable_on_migration.rb') }
+      it { should be_a_migration }
+    end
+  end
+end

spec/spec_helper.rb

@@ -19,6 +19,7 @@
 
 Bundler.require
 require File.expand_path('../../lib/acts-as-taggable-on', __FILE__)
+require 'ammeter/init'
 
 unless [].respond_to?(:freq)
   class Array