require 'abstract_unit'
require 'active_support/core_ext/object'
class ObjectTryTest < ActiveSupport::TestCase
def setup
@string = "Hello"
end
def test_nonexisting_method
method = :undefined_method
assert !@string.respond_to?(method)
assert_nil @string.try(method)
end
def test_nonexisting_method_with_arguments
method = :undefined_method
assert !@string.respond_to?(method)
assert_nil @string.try(method, 'llo', 'y')
end
def test_nonexisting_method_bang
method = :undefined_method
assert !@string.respond_to?(method)
assert_raise(NoMethodError) { @string.try!(method) }
end
def test_nonexisting_method_with_arguments_bang
method = :undefined_method
assert !@string.respond_to?(method)
assert_raise(NoMethodError) { @string.try!(method, 'llo', 'y') }
end
def test_valid_method
assert_equal 5, @string.try(:size)
end
def test_argument_forwarding
assert_equal 'Hey', @string.try(:sub, 'llo', 'y')
end
def test_block_forwarding
assert_equal 'Hey', @string.try(:sub, 'llo') { |match| 'y' }
end
def test_nil_to_type
assert_nil nil.try(:to_s)
assert_nil nil.try(:to_i)
end
def test_false_try
assert_equal 'false', false.try(:to_s)
end
def test_try_only_block
assert_equal @string.reverse, @string.try(&:reverse)
end
def test_try_only_block_bang
assert_equal @string.reverse, @string.try!(&:reverse)
end
def test_try_only_block_nil
ran = false
nil.try { ran = true }
assert_equal false, ran
end
def test_try_with_instance_eval_block
assert_equal @string.reverse, @string.try { reverse }
end
def test_try_with_instance_eval_block_bang
assert_equal @string.reverse, @string.try! { reverse }
end
def test_try_with_private_method_bang
klass = Class.new do
private
def private_method
'private method'
end
end
assert_raise(NoMethodError) { klass.new.try!(:private_method) }
end
def test_try_with_private_method
klass = Class.new do
private
def private_method
'private method'
end
end
assert_nil klass.new.try(:private_method)
end
class Decorator < SimpleDelegator
def delegator_method
'delegator method'
end
def reverse
'overridden reverse'
end
private
def private_delegator_method
'private delegator method'
end
end
def test_try_with_method_on_delegator
assert_equal 'delegator method', Decorator.new(@string).try(:delegator_method)
end
def test_try_with_method_on_delegator_target
assert_equal 5, Decorator.new(@string).size
end
def test_try_with_overriden_method_on_delegator
assert_equal 'overridden reverse', Decorator.new(@string).reverse
end
def test_try_with_private_method_on_delegator
assert_nil Decorator.new(@string).try(:private_delegator_method)
end
def test_try_with_private_method_on_delegator_bang
assert_raise(NoMethodError) do
Decorator.new(@string).try!(:private_delegator_method)
end
end
def test_try_with_private_method_on_delegator_target
klass = Class.new do
private
def private_method
'private method'
end
end
assert_nil Decorator.new(klass.new).try(:private_method)
end
def test_try_with_private_method_on_delegator_target_bang
klass = Class.new do
private
def private_method
'private method'
end
end
assert_raise(NoMethodError) do
Decorator.new(klass.new).try!(:private_method)
end
end
end
