未找到命令/使用自动测试通过“捆绑安装”安装缺少的 gem 二进制文件

我对 RoR 完全陌生。我正在关注迈克尔·哈特尔的书。我无法运行自动测试。请提出问题所在以及解决方案。

当我在 Rails 项目目录中的命令行运行“自动测试”时，我得到以下信息：

-bash: autotest: command not found

当我运行“bundle exec autotest”时，我得到以下信息：

 bundler: command not found: autotest
 Install missing gem binaries with `bundle install'

这是 Gemfile

source 'http://rubygems.org'

gem 'rails', '3.0.3'
gem 'sqlite3-ruby', :require => 'sqlite3'

group :development do
gem 'autotest'
gem 'rspec-rails', '2.4.1' 
end

group :test do
gem 'rspec', '2.4.0'
gem 'webrat', '0.7.1'
end

这是“gem list”的输出

abstract (1.0.0)
actionmailer (3.0.7, 3.0.6, 3.0.3, 2.3.5, 1.3.6)
actionpack (3.0.7, 3.0.6, 3.0.3, 2.3.5, 1.13.6)
actionwebservice (1.2.6)
activeresource (3.0.7, 3.0.6, 3.0.3, 2.3.5)
activesupport (3.0.7, 3.0.6, 3.0.3, 2.3.5, 1.4.4)
acts_as_ferret (0.4.3)
arel (2.0.9)
autotest (4.4.6)
autotest-fsevent (0.2.5)
autotest-growl (0.2.9)
autotest-notification (2.3.1)
autotest-rails-pure (4.1.2)
builder (2.1.2)
bundler (1.0.12)
capistrano (2.5.2)
cgi_multipart_eof_fix (2.5.0)
configuration (1.2.0)
daemons (1.0.10)
diff-lcs (1.1.2)
dnssd (0.6.0)
erubis (2.6.6) 
fastthread (1.0.1)
fcgi (0.8.7)
ferret (0.11.6)
gem_plugin (0.2.3)
heroku (2.0.4)
highline (1.5.0)
hpricot (0.6.164)
i18n (0.5.0)
launchy (0.4.0)
libxml-ruby (1.1.2)
mail (2.2.19, 2.2.15) 
mime-types (1.16)
mongrel (1.1.5)
mysql2 (0.2.7)
needle (1.3.0)
net-scp (1.0.1)
net-sftp (2.0.1, 1.1.1)
net-ssh (2.0.4, 1.1.4)
net-ssh-gateway (1.0.0)
nokogiri (1.4.4)
notifier (0.1.3)
polyglot (0.3.1)
rack (1.2.2, 1.0.1)
rack-mount (0.6.14)
rack-test (0.5.7)
rails (3.0.7, 3.0.6, 3.0.3, 2.3.5, 1.2.6)
railties (3.0.7, 3.0.6, 3.0.3)
rake (0.8.7, 0.8.3)
RedCloth (4.1.1)
redgreen (1.2.2)
rest-client (1.6.1)
rspec (2.5.0, 2.4.0)
rspec-core (2.5.1, 2.4.0) 
rspec-expectations (2.5.0, 2.4.0)
rspec-mocks (2.5.0, 2.4.0)
rspec-rails (2.5.0, 2.4.1)
ruby-openid (2.1.2)
ruby-yadis (0.3.4)
rubygems-update (1.7.2)
rubynode (0.1.5)
spork (0.8.4)
sqlite3-ruby (1.3.2, 1.2.5, 1.2.4)
sys-uname (0.8.5)
term-ansicolor (1.0.5)
termios (0.9.4)
test_notifier (0.3.6)
thor (0.14.6)
treetop (1.4.9)
tzinfo (0.3.27, 0.3.26)
webrat (0.7.1)
xmpp4r (0.4)
ZenTest (4.5.0)

bundle install --binstubs会将捆绑包中的所有可执行文件安装到项目中的本地 bin 目录中（请参阅http://gembundler.com/ http://gembundler.com/），然后你可以运行./bin/autotest.