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# frozen_string_literal: false
require 'test/unit'
require '-test-/string'
require_relative '../symbol/noninterned_name'
class Test_String_Fstring < Test::Unit::TestCase
include Test_Symbol::NonInterned
def assert_fstring(str)
fstr = Bug::String.fstring(str)
yield str
yield fstr
end
def test_instance_variable
str = __method__.to_s * 3
str.instance_variable_set(:@test, 42)
str.freeze
assert_fstring(str) {|s| assert_send([s, :instance_variable_defined?, :@test])}
end
def test_singleton_method
str = __method__.to_s * 3
def str.foo
end
str.freeze
assert_fstring(str) {|s| assert_send([s, :respond_to?, :foo])}
end
def test_singleton_class
str = noninterned_name
fstr = Bug::String.fstring(str)
assert_raise(TypeError) {fstr.singleton_class}
end
class S < String
end
def test_subclass
str = S.new(__method__.to_s * 3)
str.freeze
assert_fstring(str) {|s| assert_instance_of(S, s)}
end
def test_shared_string_safety
_unused = -('a' * 30).force_encoding(Encoding::ASCII)
str = ('a' * 30).force_encoding(Encoding::ASCII).taint
frozen_str = Bug::String.rb_str_new_frozen(str)
assert_fstring(frozen_str) {|s| assert_equal(str, s)}
GC.start
assert_equal('a' * 30, str, "[Bug #16151]")
end
end
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