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_overridden_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
