require 'test/unit' require File.dirname(__FILE__)+'/../lib/active_support/caching_tools' class HashCachingTests < Test::Unit::TestCase def cached(&proc) return @cached if @cached @cached_class = Class.new(&proc) @cached_class.class_eval do extend ActiveSupport::CachingTools::HashCaching hash_cache :slow_method end @cached = @cached_class.new end def test_cache_access_should_call_method cached do def slow_method(a) raise "I should be here: #{a}"; end end assert_raises(RuntimeError) { cached.slow_method_cache[1] } end def test_cache_access_should_actually_cache cached do def slow_method(a) (@x ||= []) if @x.include?(a) then raise "Called twice for #{a}!" else @x << a a + 1 end end end assert_equal 11, cached.slow_method_cache[10] assert_equal 12, cached.slow_method_cache[11] assert_equal 11, cached.slow_method_cache[10] assert_equal 12, cached.slow_method_cache[11] end def test_cache_should_be_clearable cached do def slow_method(a) @x ||= 0 @x += 1 end end assert_equal 1, cached.slow_method_cache[:a] assert_equal 2, cached.slow_method_cache[:b] assert_equal 3, cached.slow_method_cache[:c] assert_equal 1, cached.slow_method_cache[:a] assert_equal 2, cached.slow_method_cache[:b] assert_equal 3, cached.slow_method_cache[:c] cached.slow_method_cache.clear assert_equal 4, cached.slow_method_cache[:a] assert_equal 5, cached.slow_method_cache[:b] assert_equal 6, cached.slow_method_cache[:c] end def test_deep_caches_should_work_too cached do def slow_method(a, b, c) a + b + c end end assert_equal 3, cached.slow_method_cache[1][1][1] assert_equal 7, cached.slow_method_cache[1][2][4] assert_equal 7, cached.slow_method_cache[1][2][4] assert_equal 7, cached.slow_method_cache[4][2][1] assert_equal({ 1 => {1 => {1 => 3}, 2 => {4 => 7}}, 4 => {2 => {1 => 7}}}, cached.slow_method_cache ) end end