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#!/usr/bin/env rspec
require 'spec_helper'
require 'puppet/util/cacher'
class CacheTest
@@count = 0
def self.count
@@count
end
include Puppet::Util::Cacher
cached_attr(:instance_cache, 10) do
@@count += 1
{:number => @@count}
end
end
describe Puppet::Util::Cacher do
before :each do
CacheTest.set_attr_ttl(:instance_cache, 10)
@object = CacheTest.new
end
it "should return a value calculated from the provided block" do
@object.instance_cache.should == {:number => CacheTest.count}
end
it "should return the cached value from the getter every time if the value is not expired" do
@object.instance_cache.should equal(@object.instance_cache)
end
it "should regenerate and return a new value using the provided block if the value has expired" do
initial = @object.instance_cache
# Ensure the value is expired immediately
CacheTest.set_attr_ttl(:instance_cache, -10)
@object.send(:set_expiration, :instance_cache)
@object.instance_cache.should_not equal(initial)
end
it "should be able to cache false values" do
@object.expects(:init_instance_cache).once.returns false
@object.instance_cache.should be_false
@object.instance_cache.should be_false
end
it "should cache values again after expiration" do
initial = @object.instance_cache
# Ensure the value is expired immediately
CacheTest.set_attr_ttl(:instance_cache, -10)
@object.send(:set_expiration, :instance_cache)
# Reset ttl so this new value doesn't get expired
CacheTest.set_attr_ttl(:instance_cache, 10)
after_expiration = @object.instance_cache
after_expiration.should_not == initial
@object.instance_cache.should == after_expiration
end
it "should allow writing of the attribute" do
initial = @object.instance_cache
@object.instance_cache = "another value"
@object.instance_cache.should == "another value"
end
it "should update the expiration when the cached attribute is set manually" do
# Freeze time
now = Time.now
Time.stubs(:now).returns now
@object.instance_cache
# Set expiration to something far in the future
CacheTest.set_attr_ttl(:instance_cache, 60)
@object.send(:set_expiration, :instance_cache)
CacheTest.set_attr_ttl(:instance_cache, 10)
@object.instance_cache = "foo"
@object.instance_variable_get(:@attr_expirations)[:instance_cache].should == now + 10
end
it "should allow specification of a ttl as a string" do
klass = Class.new do
include Puppet::Util::Cacher
end
klass.cached_attr(:myattr, "5") { 10 }
klass.attr_ttl(:myattr).should == 5
end
it "should fail helpfully if the ttl cannot be converted to an integer" do
klass = Class.new do
include Puppet::Util::Cacher
end
lambda { klass.cached_attr(:myattr, "yep") { 10 } }.should raise_error(ArgumentError)
end
end
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