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# frozen_string_literal: false
require 'test/unit'
require 'objspace'
class TestStringMemory < Test::Unit::TestCase
def capture_allocations(klass)
allocations = []
GC.start
GC.disable
generation = GC.count
ObjectSpace.trace_object_allocations do
yield
ObjectSpace.each_object(klass) do |instance|
allocations << instance if ObjectSpace.allocation_generation(instance) == generation
end
end
return allocations
ensure
GC.enable
end
def test_byteslice_prefix
string = ("a" * 100_000).freeze
allocations = capture_allocations(String) do
string.byteslice(0, 50_000)
end
assert_equal 1, allocations.size
end
def test_byteslice_postfix
string = ("a" * 100_000).freeze
allocations = capture_allocations(String) do
string.byteslice(50_000, 100_000)
end
assert_equal 1, allocations.size
end
def test_byteslice_postfix_twice
string = ("a" * 100_000).freeze
allocations = capture_allocations(String) do
string.byteslice(50_000, 100_000).byteslice(25_000, 50_000)
end
assert_equal 2, allocations.size
end
end
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