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# frozen_string_literal: true
require 'test/unit'
require '-test-/string'
require 'rbconfig/sizeof'
class Test_StringCapacity < Test::Unit::TestCase
def capa(str)
Bug::String.capacity(str)
end
def test_capacity_embedded
size = RbConfig::SIZEOF['void*'] * 3 - 1
assert_equal size, capa('foo')
end
def test_capacity_shared
assert_equal 0, capa(:abcdefghijklmnopqrstuvwxyz.to_s)
end
def test_capacity_normal
assert_equal 128, capa('1'*128)
end
def test_s_new_capacity
assert_equal("", String.new(capacity: 1000))
assert_equal(String, String.new(capacity: 1000).class)
assert_equal(10000, capa(String.new(capacity: 10000)))
assert_equal("", String.new(capacity: -1000))
assert_equal(capa(String.new(capacity: -10000)), capa(String.new(capacity: -1000)))
end
def test_io_read
s = String.new(capacity: 1000)
open(__FILE__) {|f|f.read(1024*1024, s)}
assert_equal(1024*1024, capa(s))
open(__FILE__) {|f|s = f.read(1024*1024)}
assert_operator(capa(s), :<=, s.bytesize+4096)
end
end
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