爲什麼這個非常基本的單元測試失敗（ruby 1.9.2p290，Rails 3.0.9）？

測試/單位/ user_test.rb認爲：爲什麼這個非常基本的單元測試失敗（ruby 1.9.2p290，Rails 3.0.9）？

require 'test_helper' 

class UserTest < ActiveSupport::TestCase 
    # Replace this with your real tests. 
    test "the truth" do 
    assert true 
    end 
end

和執行：

perrys-MacBook-Pro:iway perry_mac$ ruby -Itest test/unit/user_test.rb

產生如下：上一個SQL

Loaded suite test/unit/user_test 
Started 
E 
Finished in 0.006410 seconds. 

    1) Error: 
test_the_truth(UserTest): 
ActiveRecord::StatementInvalid: SQLite3::SQLException: no such table: user_sessions: DELETE FROM "user_sessions" WHERE 1=1 
    /Users/perry_mac/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.0.9/lib/active_record/connection_adapters/abstract_adapter.rb:207:in `rescue in log' 
    /Users/perry_mac/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.0.9/lib/active_record/connection_adapters/abstract_adapter.rb:199:in `log' 
    /Users/perry_mac/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.0.9/lib/active_record/connection_adapters/sqlite_adapter.rb:135:in `execute' 
    /Users/perry_mac/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.0.9/lib/active_record/connection_adapters/abstract/database_statements.rb:288:in `update_sql' 
    /Users/perry_mac/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.0.9/lib/active_record/connection_adapters/sqlite_adapter.rb:139:in `update_sql' 
    /Users/perry_mac/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.0.9/lib/active_record/connection_adapters/abstract/database_statements.rb:293:in `delete_sql' 
    /Users/perry_mac/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.0.9/lib/active_record/connection_adapters/sqlite_adapter.rb:145:in `delete_sql' 
    /Users/perry_mac/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.0.9/lib/active_record/connection_adapters/abstract/database_statements.rb:54:in `delete' 
    /Users/perry_mac/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.0.9/lib/active_record/connection_adapters/abstract/query_cache.rb:16:in `delete' 
    /Users/perry_mac/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.0.9/lib/active_record/fixtures.rb:569:in `delete_existing_fixtures' 
    /Users/perry_mac/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.0.9/lib/active_record/fixtures.rb:531:in `block (4 levels) in create_fixtures' 
    /Users/perry_mac/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.0.9/lib/active_record/fixtures.rb:531:in `each' 
    /Users/perry_mac/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.0.9/lib/active_record/fixtures.rb:531:in `block (3 levels) in create_fixtures' 
    /Users/perry_mac/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.0.9/lib/active_record/connection_adapters/abstract/database_statements.rb:139:in `transaction' 
    /Users/perry_mac/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.0.9/lib/active_record/fixtures.rb:530:in `block (2 levels) in create_fixtures' 
    /Users/perry_mac/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.0.9/lib/active_record/connection_adapters/abstract_adapter.rb:109:in `disable_referential_integrity' 
    /Users/perry_mac/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.0.9/lib/active_record/fixtures.rb:521:in `block in create_fixtures' 
    /Users/perry_mac/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.0.9/lib/active_support/benchmarkable.rb:55:in `silence' 
    /Users/perry_mac/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.0.9/lib/active_record/fixtures.rb:520:in `create_fixtures' 
    /Users/perry_mac/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.0.9/lib/active_record/fixtures.rb:979:in `load_fixtures' 
    /Users/perry_mac/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.0.9/lib/active_record/fixtures.rb:944:in `setup_fixtures' 
    /Users/perry_mac/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.0.9/lib/active_support/callbacks.rb:415:in `_run_setup_callbacks' 
    /Users/perry_mac/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.0.9/lib/active_support/testing/setup_and_teardown.rb:34:in `run' 

1 tests, 0 assertions, 0 failures, 1 errors, 0 skips

錯誤陳述意見DELETE查詢，這看起來很奇怪。爲什麼它甚至在這裏引用user_sessions？這個測試用於通過。經過一些數據庫遷移（向現有表添加列）後，它不會。有人能幫我彌補我在這方面的理解差距嗎？有一些神祕的實體，我不得不重新加載。我試過每個：

rake db:test:clone 
rake db:test:clone_structure  
rake db:test:load 
rake db:test:prepare  
rake db:test:purge

...但仍然看到相同的輸出。我可以放棄我目前的git分支並重新開始，但是我真的很想知道是什麼讓我第一次觸動了我。請指出我是否應該查看日誌或其他信息來源以解決問題。

附錄（schema.rb）：

ActiveRecord::Schema.define(:version => 20110901142600) do 

    create_table "users", :force => true do |t| 
    t.string "username" 
    t.string "email" 
    t.string "crypted_password" 
    t.string "password_salt" 
    t.string "persistence_token" 
    t.datetime "created_at" 
    t.datetime "updated_at" 
    t.datetime "last_request_at" 
    t.datetime "current_login_at" 
    t.datetime "last_login_at" 
    t.string "current_login_ip" 
    t.string "last_login_ip" 
    end 

end

來源

2011-09-05 Perry Horwich

什麼是您的schema.rb文件？你可以發佈嗎？ – jergason

你有沒有在'database.yml'文件中配置你的測試數據庫？ –

現在將發佈架構。我沒有添加或刪除任何內容到默認數據庫YAML文件。 –

我覺得關鍵是在堆棧跟蹤的10號線：

/Users/perry_mac/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.0.9/lib/active_record/fixtures.rb:569:in `delete_existing_fixtures'

通知fixtures.rb和delete_existing_fixtures。在運行測試套件之前，Rails會清除數據庫中的所有固件。 test/fixtures中有user_sessions.yml文件嗎？

來源

2011-09-05 16:27:02 David

是的。我只是將它重命名爲：user_sessions.yml.sav，現在測試通過。謝謝！ –

我和大衛在一起;它看起來像你使用authlogic（或類似）和 ~~沒有完整的user_sessions設置~~ 生成的默認模型fixture - 你是如何創建你的UserSession模型？

來源

2011-09-05 16:30:23

rails g型號user_session在網上提供的詳細信息在這裏：http：//www.logansbailey.com/2010/10/06/how-to-setup-authlogic-in-rails-3/ –

並進一步詳細我在哪裏我在這裏出錯......我收集我創建了一個沒有相應表的模型。模型user_session的創建也創建了一個user_session.yml在test/fixtures下（以及其他地方）。當調用'rake test'時，夾具數據被刪除並重新創建。由於不存在user_session表，因此預測試刪除/創建時會拋出錯誤。 –

通過不創建user_sessions表，我是否已經實現了「最佳實踐」？看來控制器和模型已經足夠。爲了便於測試，我應該創建一個基本的user_session表嗎？非常感謝 - 佩裏 –

爲什麼這個非常基本的單元測試失敗（ruby 1.9.2p290，Rails 3.0.9）？

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