discourse/spec/components/cache_spec.rb

require 'spec_helper'
require 'cache'

describe Cache do

  let :cache do
    Cache.new
  end

  it "can be cleared" do
    cache.write("hello0", "world")
    cache.write("hello1", "world")
    cache.clear

    cache.read("hello0").should be_nil
  end

  it "can delete by family" do
    cache.write("key2", "test", family: "my_family")
    cache.write("key", "test", expires_in: 1.minute, family: "my_family")

    cache.delete_by_family("my_family")

    cache.fetch("key").should be_nil
    cache.fetch("key2").should be_nil

  end

  it "can delete correctly" do
    cache.fetch("key", expires_in: 1.minute) do
      "test"
    end

    cache.delete("key")
    cache.fetch("key").should be_nil
  end

  it "can store with expiry correctly" do
    key = cache.namespaced_key("key")
    $redis.expects(:get).with(key).returns nil
    $redis.expects(:setex).with(key, 60 , "bob")

    r = cache.fetch("key", expires_in: 1.minute) do
      "bob"
    end
    r.should == "bob"
  end

  it "can store and fetch correctly" do
    key = cache.namespaced_key("key")
    $redis.expects(:get).with(key).returns nil
    $redis.expects(:set).with(key, "bob")

    r = cache.fetch "key" do
      "bob"
    end
    r.should == "bob"
  end

  it "can fetch existing correctly" do
    key = cache.namespaced_key("key")

    $redis.expects(:get).with(key).returns "bill"

    r = cache.fetch "key" do
      "bob"
    end
    r.should == "bill"
  end
end