Rails 测试错误时抑制堆栈跟踪

Question

我是 Ruby on Rails 新手，正在编写测试。其中一些会产生异常；我希望“rake test”输出给我异常错误消息，但不是整个回溯。 （我想编写测试来执行未实现的功能，然后我将填写这些测试。）

例如，实际输出：

Started
E
Finished in 0.081054 seconds.

  1) Error:
test_should_fail(VersioningTest):
ActiveRecord::StatementInvalid: PGError: ERROR:  null value in column "client_ip" violates not-null constraint
: INSERT INTO "revisions" ("created_at", "id") VALUES ('2011-02-03 20:14:17', 980190962)
    /Users/rpriedhorsky/.rvm/gems/ruby-1.9.2-p136/gems/activerecord-3.0.3/lib/active_record/connection_adapters/abstract_adapter.rb:202:in `rescue in log'
    /Users/rpriedhorsky/.rvm/gems/ruby-1.9.2-p136/gems/activerecord-3.0.3/lib/active_record/connection_adapters/abstract_adapter.rb:194:in `log'
    /Users/rpriedhorsky/.rvm/gems/ruby-1.9.2-p136/gems/activerecord-3.0.3/lib/active_record/connection_adapters/postgresql_adapter.rb:496:in `execute'
    [... etc. etc. etc. ...]

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

所需的输出：

Started
E
Finished in 0.081054 seconds.

  1) Error:
test_should_fail(VersioningTest):
ActiveRecord::StatementInvalid: PGError: ERROR:  null value in column "client_ip" violates not-null constraint

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

我找到了信息（eg）在相反的方向上，但不抑制堆栈跟踪。

编辑：

如果能够轻松地打开和关闭它们就好了；如下所述，有时它们对于追踪错误很有用。

Answer 1

你可以看看“backtrace消音器” - 对我来说（Rails 2.3.8），这是文件config/initializers/backtrace_silencers.rb：

# Be sure to restart your server when you modify this file.

# You can add backtrace silencers for libraries that you're using but
# don't wish to see in your backtraces.
# Rails.backtrace_cleaner.add_silencer { |line| line =~ /my_noisy_library/ }

# You can also remove all the silencers if you're trying do debug a
# problem that might steem from framework code.
# Rails.backtrace_cleaner.remove_silencers!

Rails.backtrace_cleaner.add_silencer {|line| line =~ /gems/}
Rails.backtrace_cleaner.add_silencer {|line| line =~ /passenger/}

看起来你应该能够

Rails.backtrace_cleaner.add_silencer {|line| true}

在你的config/environments/中 添加一行test.rb 文件，这会清除你的回溯（尽管它可能只适用于记录器 - 我不太熟悉该方法）。

但问问你自己 - 你真的想完全消除回溯吗？它们对于追踪错误非常有用......