rails 如何保证每次单元测试都清理上一个测试的数据。
2条回答 默认 最新
- horace_lee 2009-03-20 19:58关注
我也想弄明白这个问题,google任何rails测试机制都找不到有营养的解释
查书后,看到一些有价值的东西
是讲ruby的测试怎么跑的
[code="ruby"]
module Unit
# If set to false Test::Unit will not automatically run at exit.
def self.run=(flag)
@run = flag
end# Automatically run tests at exit? def self.run? @run ||= false end
end
endat_exit do
unless $! || Test::Unit.run?
exit Test::Unit::AutoRunner.run
end
end
[/code]
当然,rails一定调用ruby的这个流程。
简单讲,注册at_exit这个例程,这个kernel方法,在执行结束,执行Test::Unit::AutoRunner.run
再相应执行:
[code="ruby"]
RUNNERS = {
:console => proc do |r|
require 'test/unit/ui/console/testrunner'
Test::Unit::UI::Console::TestRunner
end,
:gtk => proc do |r|
require 'test/unit/ui/gtk/testrunner'
Test::Unit::UI::GTK::TestRunner
end,
:gtk2 => proc do |r|
require 'test/unit/ui/gtk2/testrunner'
Test::Unit::UI::GTK2::TestRunner
end,
:fox => proc do |r|
require 'test/unit/ui/fox/testrunner'
Test::Unit::UI::Fox::TestRunner
end,
:tk => proc do |r|
require 'test/unit/ui/tk/testrunner'
Test::Unit::UI::Tk::TestRunner
end,
}
[/code]看了这个源代码,就对ruby处理单元测试,大体了解。那么想知道Rails怎么做的只要,相应的看源代码就最好。
于是,找到rubyonrails的api
Class
ActiveSupport::TestCase
In: vendor/rails/railties/lib/test_help.rb vendor/rails/activesupport/lib/active_support/test_case.rb
下面有
* ActiveRecord::TestFixtures
* Rails::BacktraceFilterForTestUnit
* ActiveSupport::Testing::Default
* ActiveSupport::Testing::SetupAndTeardown
* ActiveSupport::Testing::Assertions
* ActiveSupport::Testing::Deprecation而ActiveRecord::TestFixtures是我们要找的,需要加载数据的那个
继续读有如下方法:
[code="ruby"]
Methods* included * run_in_transaction? * setup_fixtures * teardown_fixtures
[/code]
继续读,就清楚多了,一个加载环境,一个回滚。所以,理论上讲如果,你不想加载数据,也可以从这里修改。
[code="ruby"]
def self.included(base)
base.class_eval do
setup :setup_fixtures
teardown :teardown_fixturessuperclass_delegating_accessor :fixture_path superclass_delegating_accessor :fixture_table_names superclass_delegating_accessor :fixture_class_names superclass_delegating_accessor :use_transactional_fixtures superclass_delegating_accessor :use_instantiated_fixtures # true, false, or :no_instances superclass_delegating_accessor :pre_loaded_fixtures self.fixture_table_names = [] self.use_transactional_fixtures = false self.use_instantiated_fixtures = true self.pre_loaded_fixtures = false self.fixture_class_names = {} end base.extend ClassMethods end
[/code]
[code="ruby"]
def setup_fixtures
return unless defined?(ActiveRecord) && !ActiveRecord::Base.configurations.blank?if pre_loaded_fixtures && !use_transactional_fixtures raise RuntimeError, 'pre_loaded_fixtures requires use_transactional_fixtures' end @fixture_cache = {} @@already_loaded_fixtures ||= {} # Load fixtures once and begin transaction. if run_in_transaction? if @@already_loaded_fixtures[self.class] @loaded_fixtures = @@already_loaded_fixtures[self.class] else load_fixtures @@already_loaded_fixtures[self.class] = @loaded_fixtures end ActiveRecord::Base.connection.increment_open_transactions ActiveRecord::Base.connection.transaction_joinable = false ActiveRecord::Base.connection.begin_db_transaction # Load fixtures for every test. else Fixtures.reset_cache @@already_loaded_fixtures[self.class] = nil load_fixtures end # Instantiate fixtures for every test if requested. instantiate_fixtures if use_instantiated_fixtures end
[/code]
[code="ruby"]
def teardown_fixtures
return unless defined?(ActiveRecord) && !ActiveRecord::Base.configurations.blank?
unless run_in_transaction?
Fixtures.reset_cache
end# Rollback changes if a transaction is active. if run_in_transaction? && ActiveRecord::Base.connection.open_transactions != 0 ActiveRecord::Base.connection.rollback_db_transaction ActiveRecord::Base.connection.decrement_open_transactions end ActiveRecord::Base.clear_active_connections! end
[/code]
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