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 end def defined_test return !defined?(yield) end def test_defined $x = nil assert(defined?($x)) # global variable assert_equal('global-variable', defined?($x))# returns description assert_nil(defined?(foo)) # undefined foo=5 assert(defined?(foo)) # local variable assert(defined?(Array)) # constant assert(defined?(::Array)) # toplevel constant assert(defined?(File::Constants)) # nested constant assert(defined?(Object.new)) # method assert(!defined?(Object.print)) # private method assert(defined?(1 == 2)) # operator expression f = Foo.new assert_nil(defined?(f.foo)) # protected method f.bar(f) { |v| assert(v) } assert_nil(defined?(f.quux)) # undefined method assert_nil(defined?(f.baz(x))) # undefined argument x = 0 assert(defined?(f.baz(x))) assert_nil(defined?(f.quux(x))) assert(defined?(print(x))) assert_nil(defined?(quux(x))) assert(defined_test) # not iterator assert(!defined_test{}) # called as iterator /a/ =~ '' assert_equal nil, defined?($&) 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 end