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require 'abstract_unit'
class SynchronizationTest < Test::Unit::TestCase
def setup
@target = Class.new
@target.cattr_accessor :mutex, :instance_writer => false
@target.mutex = Mutex.new
@instance = @target.new
end
def test_synchronize_aliases_method_chain_with_synchronize
@target.module_eval do
attr_accessor :value
synchronize :value, :with => :mutex
end
assert @instance.respond_to?(:value_with_synchronization)
assert @instance.respond_to?(:value_without_synchronization)
end
def test_synchronize_does_not_change_behavior
@target.module_eval do
attr_accessor :value
synchronize :value, :with => :mutex
end
expected = "some state"
@instance.value = expected
assert_equal expected, @instance.value
end
def test_synchronize_with_no_mutex_raises_an_argument_error
assert_raises(ArgumentError) do
@target.synchronize :to_s
end
end
def test_double_synchronize_raises_an_argument_error
@target.synchronize :to_s, :with => :mutex
assert_raises(ArgumentError) do
@target.synchronize :to_s, :with => :mutex
end
end
def dummy_sync
dummy = Object.new
def dummy.synchronize
@sync_count ||= 0
@sync_count += 1
yield
end
def dummy.sync_count; @sync_count; end
dummy
end
def test_mutex_is_entered_during_method_call
@target.mutex = dummy_sync
@target.synchronize :to_s, :with => :mutex
@instance.to_s
@instance.to_s
assert_equal 2, @target.mutex.sync_count
end
def test_can_synchronize_method_with_punctuation
@target.module_eval do
def dangerous?
@dangerous
end
def dangerous!
@dangerous = true
end
end
@target.synchronize :dangerous?, :dangerous!, :with => :mutex
@instance.dangerous!
assert @instance.dangerous?
end
def test_can_synchronize_singleton_methods
@target.mutex = dummy_sync
class << @target
synchronize :to_s, :with => :mutex
end
assert @target.respond_to?(:to_s_without_synchronization)
assert_nothing_raised { @target.to_s; @target.to_s }
assert_equal 2, @target.mutex.sync_count
end
end
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