テスト駆動-02ユニットテスト

$ruby script/generate migration expand_text

/002_expand_text.rb

class ExpandText < ActiveRecord::Migration
  def self.up
    change_column :members, :text, :string, :limit => 8
  end

  def self.down
    change_column :members, :text, :string, :limit => 16
  end
end

/test/unit/member_test.rb

require File.dirname(__FILE__) + '/../test_helper'

class MemberTest < Test::Unit::TestCase
  fixtures :members

  # Replace this with your real tests.
  def test_truth
    assert true
  end
  def test_text_length
    members(:one).text = '+' * 256
    assert members(:one).valid?, 'for 16 chars'
    members(:one).text = '+' * 257
    assert members(:one).valid?, 'for 17 chars'
  end
end

エラーがなければ、下記のような形になります。

$ rake test:units
(in /Users/mono/dev/rails/chap0425)
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby -I"/Users/mono/dev/rails/chap0425/lib" -I"/Users/mono/dev/rails/chap0425/test" "/Library/Ruby/Gems/1.8/gems/rake-0.8.4/lib/rake/rake_test_loader.rb" "test/unit/member_test.rb" 
Loaded suite /Library/Ruby/Gems/1.8/gems/rake-0.8.4/lib/rake/rake_test_loader
Started
..
Finished in 0.054064 seconds.

2 tests, 3 assertions, 0 failures, 0 errors
mono-no-macbook:chap0425 mono$