@leisurelink/trusted-endpoint/test/cache.tests.js

'use strict';

var expect = require('chai').expect;
var cache = require('../lib/cache');
var Promise = require('bluebird');

describe('cache', function(){
  var ns = 'ns', key = 'key', ttl = 1000, ct = 0, value = 'value';
  function getter() {
    ct++; return 'value';
  }
  function asyncGetter(){
    ct++;
    return Promise.resolve(value);
  }
  beforeEach(function(){
    cache.enable();
    cache.clear();
    ct = 0;
  });

  it('should only call getter with the first call', function(){
    return cache.get(ns, key, ttl, getter)
      .then(function(){
        return cache.get(ns, key, ttl, getter);
      }).then(function(val){
        expect(val).to.eql(value);
        expect(ct).to.eql(1);
      });
  });

  it('should only call async getter with the first call', function(){
    return cache.get(ns, key, ttl, asyncGetter)
      .then(function(){
        return cache.get(ns, key, ttl, asyncGetter);
      }).then(function(val){
        expect(val).to.eql(value);
        expect(ct).to.eql(1);
      });
  });

  it('should call getter again after ttl', function(){
    return cache.get(ns, key, ttl, asyncGetter)
      .then(function(){
        return Promise.delay(ttl + 100);
      }).then(function(){
        return cache.get(ns, key, ttl, asyncGetter);
      }).then(function(val){
        expect(val).to.eql(value);
        expect(ct).to.eql(2);
      });
  });

  it('can clear cache after disabling', function(){
    cache.disable();
    cache.clear();
  });
});