picopackage/test/test_cache.rb

# frozen_string_literal: true

require "test_helper"

class TestCache < Minitest::Test
  def with_cache
    Dir.mktmpdir("picopackage-cache") { |root| yield Picopackage::Cache.new(root: root) }
  end

  def test_stores_and_fetches_by_content
    with_cache do |cache|
      checksum = cache.store("hello\n")
      assert_equal Picopackage::Payload.checksum("hello\n"), checksum
      assert_equal "hello\n", cache.fetch(checksum)
    end
  end

  def test_storing_twice_is_harmless
    with_cache do |cache|
      a = cache.store("hello\n")
      b = cache.store("hello\n")
      assert_equal a, b
      assert_equal "hello\n", cache.fetch(a)
    end
  end

  def test_unknown_and_malformed_checksums_return_nil
    with_cache do |cache|
      assert_nil cache.fetch(Picopackage::Payload.checksum("never stored"))
      assert_nil cache.fetch(nil)
      assert_nil cache.fetch("")
      assert_nil cache.fetch("sha256:../../escape")
      refute cache.include?(nil)
    end
  end
end