require 'test/unit' class TestDefined < Test::Unit::TestCase class Foo def foo p :foo end protected :foo def bar(f) yield(defined?(self.foo)) yield(defined?(f.foo)) end def baz(f) end attr_accessor :attr def attrasgn_test yield(defined?(self.attr = 1)) end end def defined_test return !defined?(yield) end def test_defined $x = nil assert(defined?($x)) # global variable assert_equal('global-variable', defined?($x))# returns description assert_nil(defined?(foo)) # undefined foo=5 assert(defined?(foo)) # local variable assert(defined?(Array)) # constant assert(defined?(::Array)) # toplevel constant assert(defined?(File::Constants)) # nested constant assert(defined?(Object.new)) # method assert(defined?(Object::new)) # method assert(!defined?(Object.print)) # private method assert(defined?(1 == 2)) # operator expression f = Foo.new assert_nil(defined?(f.foo)) # protected method f.bar(f) { |v| assert(v) } assert_nil(defined?(f.quux)) # undefined method assert_nil(defined?(f.baz(x))) # undefined argument x = 0 assert(defined?(f.baz(x))) assert_nil(defined?(f.quux(x))) assert(defined?(print(x))) assert_nil(defined?(quux(x))) assert(defined?(f.attr = 1)) f.attrasgn_test { |v| assert(v) } assert(defined_test) # not iterator assert(!defined_test{}) # called as iterator /a/ =~ '' assert_equal nil, defined?($&) assert_equal nil, defined?($`) assert_equal nil, defined?($') assert_equal nil, defined?($+) assert_equal nil, defined?($1) assert_equal nil, defined?($2) /a/ =~ 'a' assert_equal 'global-variable', defined?($&) assert_equal 'global-variable', defined?($`) assert_equal 'global-variable', defined?($') # ' assert_equal nil, defined?($+) assert_equal nil, defined?($1) assert_equal nil, defined?($2) /(a)/ =~ 'a' assert_equal 'global-variable', defined?($&) assert_equal 'global-variable', defined?($`) assert_equal 'global-variable', defined?($') # ' assert_equal 'global-variable', defined?($+) assert_equal 'global-variable', defined?($1) assert_equal nil, defined?($2) /(a)b/ =~ 'ab' assert_equal 'global-variable', defined?($&) assert_equal 'global-variable', defined?($`) assert_equal 'global-variable', defined?($') # ' assert_equal 'global-variable', defined?($+) assert_equal 'global-variable', defined?($1) assert_equal nil, defined?($2) end class TestAutoloadedSuperclass autoload :A, "a" end class TestAutoloadedSubclass < TestAutoloadedSuperclass def a? defined?(A) end end def test_autoloaded_subclass bug = "[ruby-core:35509]" x = TestAutoloadedSuperclass.new class << x def a?; defined?(A); end end assert_equal("constant", x.a?, bug) assert_equal("constant", TestAutoloadedSubclass.new.a?, bug) end class TestAutoloadedNoload autoload :A, "a" def a? defined?(A) end end def test_autoloaded_noload loaded = $".dup $".clear x = TestAutoloadedNoload.new assert_equal("constant", x.a?) assert_equal([], $") ensure $".replace(loaded) end end