Module: ActiveSupport::LogSubscriber::TestHelper

### Home Classes Methods

### In Files

- lib/active_support/log_subscriber/test_helper.rb

### Namespace

- CLASS ActiveSupport::LogSubscriber::TestHelper::MockLogger

### Methods

- #set_logger
- #setup
- #teardown
- #wait

### Class/Module Index

Quicksearch

- ActiveSupport
- ActiveSupport::Autoload
- ActiveSupport::BacktraceCleaner
- ActiveSupport::Base64
- ActiveSupport::BasicObject
- ActiveSupport::Benchmarkable
- ActiveSupport::BufferedLogger
- ActiveSupport::BufferedLogger::Severity
- ActiveSupport::Cache
- ActiveSupport::Cache::Entry
- ActiveSupport::Cache::FileStore
- ActiveSupport::Cache::MemCacheStore
- ActiveSupport::Cache::MemoryStore
- ActiveSupport::Cache::NullStore
- ActiveSupport::Cache::Store
- ActiveSupport::Cache::Strategy
- ActiveSupport::Cache::Strategy::LocalCache
- ActiveSupport::Cache::Strategy::LocalCache::LocalStore
- ActiveSupport::Callbacks
- ActiveSupport::Callbacks::ClassMethods
- ActiveSupport::Concern
- ActiveSupport::Configurable
- ActiveSupport::Configurable::ClassMethods
- ActiveSupport::Configurable::Configuration
- ActiveSupport::Dependencies
- ActiveSupport::Dependencies::ClassCache
- ActiveSupport::Dependencies::WatchStack
- ActiveSupport::Deprecation
- ActiveSupport::DescendantsTracker
- ActiveSupport::Duration
- ActiveSupport::FileUpdateChecker
- ActiveSupport::FileWatcher
- ActiveSupport::FileWatcher::Backend
- ActiveSupport::Gzip
- ActiveSupport::Gzip::Stream
- ActiveSupport::HashWithIndifferentAccess
- ActiveSupport::HashWithIndifferentAccess
- ActiveSupport::Inflector
- ActiveSupport::Inflector::Inflections
- ActiveSupport::InheritableOptions
- ActiveSupport::JSON
- ActiveSupport::JSON::Encoding
- ActiveSupport::JSON::Encoding::CircularReferenceError
- ActiveSupport::JSON::Encoding::Encoder
- ActiveSupport::JSON::Variable
- ActiveSupport::LogSubscriber
- ActiveSupport::LogSubscriber::TestHelper
- ActiveSupport::LogSubscriber::TestHelper::MockLogger
- ActiveSupport::Memoizable
- ActiveSupport::Memoizable::InstanceMethods
- ActiveSupport::MessageEncryptor
- ActiveSupport::MessageEncryptor::InvalidMessage
- ActiveSupport::MessageVerifier
- ActiveSupport::MessageVerifier::InvalidSignature
- ActiveSupport::Multibyte
- ActiveSupport::Multibyte::Chars
- ActiveSupport::Multibyte::EncodingError
- ActiveSupport::Multibyte::Unicode
- ActiveSupport::Multibyte::Unicode::Codepoint
- ActiveSupport::Multibyte::Unicode::UnicodeDatabase
- ActiveSupport::Notifications
- ActiveSupport::Notifications::Event
- ActiveSupport::Notifications::Fanout
- ActiveSupport::Notifications::Instrumenter
- ActiveSupport::OrderedHash
- ActiveSupport::OrderedOptions
- ActiveSupport::Railtie
- ActiveSupport::Rescuable
- ActiveSupport::Rescuable::ClassMethods
- ActiveSupport::SafeBuffer
- ActiveSupport::SafeBuffer::SafeConcatError
- ActiveSupport::StringInquirer
- ActiveSupport::TaggedLogging
- ActiveSupport::TestCase
- ActiveSupport::Testing
- ActiveSupport::Testing::Assertions
- ActiveSupport::Testing::Declarative
- ActiveSupport::Testing::Isolation
- ActiveSupport::Testing::Isolation::Forking
- ActiveSupport::Testing::Isolation::MiniTest
- ActiveSupport::Testing::Isolation::Subprocess
- ActiveSupport::Testing::Isolation::TestUnit
- ActiveSupport::Testing::Pending
- ActiveSupport::Testing::Performance
- ActiveSupport::Testing::Performance::Benchmarker
- ActiveSupport::Testing::Performance::ForClassicTestUnit
- ActiveSupport::Testing::Performance::ForMiniTest
- ActiveSupport::Testing::Performance::Metrics
- ActiveSupport::Testing::Performance::Metrics::Amount
- ActiveSupport::Testing::Performance::Metrics::Base
- ActiveSupport::Testing::Performance::Metrics::CpuTime
- ActiveSupport::Testing::Performance::Metrics::DigitalInformationUnit
- ActiveSupport::Testing::Performance::Metrics::GcRuns
- ActiveSupport::Testing::Performance::Metrics::GcTime
- ActiveSupport::Testing::Performance::Metrics::Memory
- ActiveSupport::Testing::Performance::Metrics::Objects
- ActiveSupport::Testing::Performance::Metrics::ProcessTime
- ActiveSupport::Testing::Performance::Metrics::Time
- ActiveSupport::Testing::Performance::Metrics::UserTime
- ActiveSupport::Testing::Performance::Metrics::WallTime
- ActiveSupport::Testing::Performance::Performer
- ActiveSupport::Testing::Performance::Profiler
- ActiveSupport::Testing::ProxyTestResult
- ActiveSupport::Testing::RemoteError
- ActiveSupport::Testing::SetupAndTeardown
- ActiveSupport::Testing::SetupAndTeardown::ClassMethods
- ActiveSupport::Testing::SetupAndTeardown::ForClassicTestUnit
- ActiveSupport::Testing::SetupAndTeardown::ForMiniTest
- ActiveSupport::TimeWithZone
- ActiveSupport::TimeZone
- ActiveSupport::XmlMini
- ActiveSupport::XmlMini_LibXMLSAX
- ActiveSupport::XmlMini_LibXMLSAX::HashBuilder
- ActiveSupport::XmlMini_NokogiriSAX
- ActiveSupport::XmlMini_NokogiriSAX::HashBuilder
- Test
- Test::Unit
- Test::Unit::Collector
- Test::Unit::Collector::ObjectSpace
- Object
- Object::HashWithIndifferentAccess
- Object::MissingSourceFile
- ERB
- ERB::Util
- I18n
- I18n::Railtie
- LoadError
- LoadError
- Logger
- Logger::SimpleFormatter
- Array
- Base64
- Benchmark
- BigDecimal
- Class
- Date
- DateTime
- Enumerable
- FalseClass
- File
- Float
- Hash
- Integer
- Kernel
- Module
- NameError
- NilClass
- Numeric
- Process
- QualifiedConstUtils
- Range
- Regexp
- String
- Symbol
- Time
- TrueClass
- URI

No matching classes.

# ActiveSupport::LogSubscriber::TestHelper

Provides some helpers to deal with testing log subscribers by setting up notifications. Take for instance Active Record subscriber tests:

    class SyncLogSubscriberTest < ActiveSupport::TestCase
      include ActiveSupport::LogSubscriber::TestHelper

      def setup
        ActiveRecord::LogSubscriber.attach_to(:active_record)
      end

      def test_basic_query_logging
        Developer.all
        wait
        assert_equal 1, @logger.logged(:debug).size
        assert_match(/Developer Load/, @logger.logged(:debug).last)
        assert_match(/SELECT \* FROM "developers"/, @logger.logged(:debug).last)
      end
    end

All you need to do is to ensure that your log subscriber is added to Rails::Subscriber, as in the second line of the code above. The test helpers are responsible for setting up the queue, subscriptions and turning colors in logs off.

The messages are available in the @logger instance, which is a logger with limited powers (it actually does not send anything to your output), and you can collect them doing @logger.logged(level), where level is the level used in logging, like info, debug, warn and so on.

### Public Instance Methods

set_logger(logger) click to toggle source

Overwrite if you use another logger in your log subscriber:

    def logger
      ActiveRecord::Base.logger = @logger
    end

    # File lib/active_support/log_subscriber/test_helper.rb, line 96
    def set_logger(logger)
      ActiveSupport::LogSubscriber.logger = logger
    end

setup() click to toggle source

    # File lib/active_support/log_subscriber/test_helper.rb, line 36
    def setup
      @logger   = MockLogger.new
      @notifier = ActiveSupport::Notifications::Fanout.new

      ActiveSupport::LogSubscriber.colorize_logging = false

      @old_notifier = ActiveSupport::Notifications.notifier
      set_logger(@logger)
      ActiveSupport::Notifications.notifier = @notifier
    end

teardown() click to toggle source

    # File lib/active_support/log_subscriber/test_helper.rb, line 47
    def teardown
      set_logger(nil)
      ActiveSupport::Notifications.notifier = @old_notifier
    end

wait() click to toggle source

Wait notifications to be published.

    # File lib/active_support/log_subscriber/test_helper.rb, line 86
    def wait
      @notifier.wait
    end

[Validate]

Generated with the Darkfish Rdoc Generator 2.