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# frozen_string_literal: false
require 'test/unit'
class TestAlias < Test::Unit::TestCase
class Alias0
def foo
"foo"
end
end
class Alias1 < Alias0
alias bar foo
def foo
"foo+#{super}"
end
end
class Alias2 < Alias1
alias baz foo
undef foo
end
class Alias3 < Alias2
def foo
super
end
def bar
super
end
def quux
super
end
end
class Alias4 < Alias0
alias foo1 foo
alias foo2 foo1
alias foo3 foo2
end
class Alias5 < Alias4
alias foo1 foo
alias foo3 foo2
alias foo2 foo1
end
def test_alias
x = Alias2.new
assert_equal "foo", x.bar
assert_equal "foo+foo", x.baz
assert_equal "foo+foo", x.baz # test_check for cache
x = Alias3.new
assert_raise(NoMethodError) { x.foo }
assert_equal "foo", x.bar
assert_raise(NoMethodError) { x.quux }
end
def test_alias_inspect
o = Alias4.new
assert_equal("TestAlias::Alias4(TestAlias::Alias0)#foo()", o.method(:foo).inspect.split[1])
assert_equal("TestAlias::Alias4(TestAlias::Alias0)#foo1(foo)()", o.method(:foo1).inspect.split[1])
assert_equal("TestAlias::Alias4(TestAlias::Alias0)#foo2(foo)()", o.method(:foo2).inspect.split[1])
assert_equal("TestAlias::Alias4(TestAlias::Alias0)#foo3(foo)()", o.method(:foo3).inspect.split[1])
o = Alias5.new
assert_equal("TestAlias::Alias5(TestAlias::Alias0)#foo()", o.method(:foo).inspect.split[1])
assert_equal("TestAlias::Alias5(TestAlias::Alias0)#foo1(foo)()", o.method(:foo1).inspect.split[1])
assert_equal("TestAlias::Alias5(TestAlias::Alias0)#foo2(foo)()", o.method(:foo2).inspect.split[1])
assert_equal("TestAlias::Alias5(TestAlias::Alias0)#foo3(foo)()", o.method(:foo3).inspect.split[1])
end
def test_nonexistmethod
assert_raise(NameError){
Class.new{
alias_method :foobarxyzzy, :barbaz
}
}
end
def test_send_alias
x = "abc"
class << x
alias_method :try, :__send__
end
assert_equal("ABC", x.try(:upcase), '[ruby-dev:38824]')
end
def test_special_const_alias
assert_raise(TypeError) do
1.instance_eval do
alias to_string to_s
end
end
end
def test_alias_with_zsuper_method
c = Class.new
c.class_eval do
def foo
:ok
end
def bar
:ng
end
private :foo
end
d = Class.new(c)
d.class_eval do
public :foo
alias bar foo
end
assert_equal(:ok, d.new.bar)
end
module SuperInAliasedModuleMethod
module M
def foo
super << :M
end
alias bar foo
end
class Base
def foo
[:Base]
end
end
class Derived < Base
include M
end
end
# [ruby-dev:46028]
def test_super_in_aliased_module_method # fails in 1.8
assert_equal([:Base, :M], SuperInAliasedModuleMethod::Derived.new.bar)
end
def test_alias_wb_miss
assert_normal_exit "#{<<-"begin;"}\n#{<<-'end;'}"
begin;
require 'stringio'
GC.verify_internal_consistency
GC.start
class StringIO
alias_method :read_nonblock, :sysread
end
GC.verify_internal_consistency
end;
end
def test_cyclic_zsuper
bug9475 = '[ruby-core:60431] [Bug #9475]'
a = Module.new do
def foo
"A"
end
end
b = Class.new do
include a
attr_reader :b
def foo
@b ||= 0
raise SystemStackError if (@b += 1) > 1
# "foo from B"
super + "B"
end
end
c = Class.new(b) do
alias orig_foo foo
def foo
# "foo from C"
orig_foo + "C"
end
end
b.class_eval do
alias orig_foo foo
attr_reader :b2
def foo
@b2 ||= 0
raise SystemStackError if (@b2 += 1) > 1
# "foo from B (again)"
orig_foo + "B2"
end
end
assert_nothing_raised(SystemStackError, bug9475) do
assert_equal("ABC", c.new.foo, bug9475)
end
end
def test_alias_in_module
bug9663 = '[ruby-core:61635] [Bug #9663]'
assert_separately(['-', bug9663], "#{<<-"begin;"}\n#{<<-'end;'}")
begin;
bug = ARGV[0]
m = Module.new do
alias orig_to_s to_s
end
o = Object.new.extend(m)
assert_equal(o.to_s, o.orig_to_s, bug)
end;
end
class C0; def foo; end; end
class C1 < C0; alias bar foo; end
def test_alias_method_equation
obj = C1.new
assert_equal(obj.method(:bar), obj.method(:foo))
assert_equal(obj.method(:foo), obj.method(:bar))
end
def test_alias_class_method_added
name = nil
k = Class.new {
def foo;end
def self.method_added(mid)
@name = instance_method(mid).original_name
end
alias bar foo
name = @name
}
assert_equal(:foo, k.instance_method(:bar).original_name)
assert_equal(:foo, name)
end
def test_alias_module_method_added
name = nil
k = Module.new {
def foo;end
def self.method_added(mid)
@name = instance_method(mid).original_name
end
alias bar foo
name = @name
}
assert_equal(:foo, k.instance_method(:bar).original_name)
assert_equal(:foo, name)
end
def test_alias_suppressing_redefinition
assert_in_out_err(%w[-w], "#{<<~"begin;"}\n#{<<~'end;'}")
begin;
class A
def foo; end
alias foo foo
def foo; end
end
end;
end
def test_alias_memory_leak
assert_no_memory_leak([], "#{<<~"begin;"}", "#{<<~'end;'}", rss: true)
begin;
class A
500.times do
1000.times do |i|
define_method(:"foo_#{i}") {}
alias :"foo_#{i}" :"foo_#{i}"
remove_method :"foo_#{i}"
end
GC.start
end
end
end;
end
end
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