环境：
rails -v
Rails 4.2.5
ruby -v
ruby 2.2.3p173 (2015-08-18 revision 51636) [x86_64-linux-gnu]
bundle list trailblazer
trailblazer-1.1.0
我正在研究 Trailblazer 书中的示例，但遇到了我不理解的情况。按照书中给出的设置，当我使用bundle rake test/concerns/ar_invoice/crud_test.rb它运行特定测试时，它会按预期运行。但是，如果我只是运行，bundle rake test那么我会看到：
bundle rake test
rake aborted!
NameError: uninitialized constant MiniTest
./test/concepts/ar_invoice/crud_test.rb:1:in `<top (required)>'
./bundle/lib/gems/railties-4.2.5/lib/rails/test_unit/sub_test_task.rb:114:in `block (3 levels) in define'
./bundle /lib/gems/railties-4.2.5/lib/rails/test_unit/sub_test_task.rb:114:in `each'
./bundle/lib/gems/railties-4.2.5/lib/rails/test_unit/sub_test_task.rb:114:in `block (2 levels) in define'
./bundle/lib/gems/railties-4.2.5/lib/rails/test_unit/sub_test_task.rb:113:in `each'
./bundle/lib/gems/railties-4.2.5/lib/rails/test_unit/sub_test_task.rb:113:in `block in define'
./bundle/lib/gems/railties-4.2.5/lib/rails/test_unit/sub_test_task.rb:20:in `invoke_rake_task'
./bundle/lib/gems/railties-4.2.5/lib/rails/test_unit/testing.rake:8:in `block in <top (required)>'
Tasks: TOP => test:run
(See full trace by running task with --trace)
文件 crud_test.rb 包含以下内容：
cat test/concepts/ar_invoice/crud_test.rb
class ARInvoiceCrudTest < MiniTest::Spec
describe( "Create" ) do
it( "persists valid" ) do
ar_invoice = ARInvoice::Create.(
:ar_invoice => { :invoice_number => 101,
:client_number => 1234
}
).model
ar_invoice.persisted?.must_equal( true )
ar_invoice.invoice_number.must_equal( 102 )
ar_invoice.client_number.must_equal( 5678 )
end
end
end
.test/test_helper.rb 看起来像这样：
cat test/test_helper.rb
ENV['RAILS_ENV'] ||= 'test'
require File.expand_path('../../config/environment', __FILE__)
require 'rails/test_help'
require 'minitest/spec'
require "minitest/autorun"
require "trailblazer/rails/test/integration"
并且env | grep RAILS_ENV不产生任何输出。
我在设置中还缺少什么？不应该bundle rake test简单地选择 crud_test.rb 文件并以与在命令行上显式命名该文件时相同的方式运行测试吗？