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require File.dirname(__FILE__) + '/abstract_unit'
require File.join(File.dirname(File.dirname(__FILE__)), 'lib/active_support/caching_tools.rb')
class HashCachingTests < Test::Unit::TestCase
def cached(&proc)
return @cached if defined?(@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
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