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# frozen_string_literal: false
require 'test/unit'
require "-test-/string"
class Test_StrSetLen < Test::Unit::TestCase
def setup
# Make string long enough so that it is not embedded
@range_end = ("0".ord + GC::INTERNAL_CONSTANTS[:BASE_SLOT_SIZE]).chr
@s0 = [*"0"..@range_end].join("").freeze
@s1 = Bug::String.new(@s0)
end
def teardown
orig = [*"0"..@range_end].join("")
assert_equal(orig, @s0)
end
def test_non_shared
@s1.modify!
assert_equal("012", @s1.set_len(3))
end
def test_shared
assert_raise(RuntimeError) {
@s1.set_len(3)
}
end
def test_capacity_equals_to_new_size
bug12757 = "[ruby-core:77257] [Bug #12757]"
# fill to ensure capacity does not decrease with force_encoding
str = Bug::String.new("\x00" * 128, capacity: 128)
str.force_encoding("UTF-32BE")
assert_equal 128, Bug::String.capacity(str)
assert_equal 127, str.set_len(127).bytesize, bug12757
end
def test_coderange_after_append
u = -"\u3042"
str = Bug::String.new(encoding: Encoding::UTF_8)
bsize = u.bytesize
str.append(u)
assert_equal 0, str.bytesize
str.set_len(bsize)
assert_equal bsize, str.bytesize
assert_predicate str, :valid_encoding?
assert_not_predicate str, :ascii_only?
assert_equal u, str
end
def test_coderange_after_trunc
u = -"\u3042"
bsize = u.bytesize
str = Bug::String.new(u)
str.set_len(bsize - 1)
assert_equal bsize - 1, str.bytesize
assert_not_predicate str, :valid_encoding?
assert_not_predicate str, :ascii_only?
str.append(u.byteslice(-1))
str.set_len(bsize)
assert_equal bsize, str.bytesize
assert_predicate str, :valid_encoding?
assert_not_predicate str, :ascii_only?
assert_equal u, str
end
def test_valid_encoding_after_resized
s = "\0\0".force_encoding(Encoding::UTF_16BE)
str = Bug::String.new(s)
assert_predicate str, :valid_encoding?
str.resize(1)
assert_not_predicate str, :valid_encoding?
str.resize(2)
assert_predicate str, :valid_encoding?
str.resize(3)
assert_not_predicate str, :valid_encoding?
s = "\xDB\x00\xDC\x00".force_encoding(Encoding::UTF_16BE)
str = Bug::String.new(s)
assert_predicate str, :valid_encoding?
str.resize(2)
assert_not_predicate str, :valid_encoding?
end
end
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