ger_tests = (ESM) -> ns = global.default_namespace describe 'recommending for a thing', -> it 'works never returns null weight', -> init_ger(ESM) .then (ger) -> bb.all([ ger.event(ns, 'p1','view','a', expires_at: tomorrow), ger.event(ns, 'p1','view','b', expires_at: tomorrow), ger.event(ns, 'p1','view','c', expires_at: tomorrow), ]) .then(-> ger.recommendations_for_thing(ns, 'a', actions: {view: 1})) .then((recs) -> recs = recs.recommendations for r in recs if r.weight != 0 (!!r.weight).should.equal true ) it 'should not recommend the same thing', -> init_ger(ESM) .then (ger) -> bb.all([ ger.event(ns, 'p1','view','a', expires_at: tomorrow), ger.event(ns, 'p1','view','b', expires_at: tomorrow), ]) .then(-> ger.recommendations_for_thing(ns, 'a', actions: {view: 2})) .then((recs) -> recs = recs.recommendations recs.length.should.equal 1 recs[0].thing.should.equal 'b' ) it 'doesnt return expired things', -> init_ger(ESM) .then (ger) -> bb.all([ ger.event(ns, 'p1','view','a', expires_at: tomorrow), ger.event(ns, 'p1','view','b', expires_at: tomorrow), ger.event(ns, 'p1','view','c', expires_at: yesterday), ]) .then(-> ger.recommendations_for_thing(ns, 'a', actions: {view: 1})) .then((recs) -> recs = recs.recommendations recs.length.should.equal 1 recs[0].thing.should.equal 'b' ) it 'should not more highly rate bad recommendations', -> init_ger(ESM) .then (ger) -> bb.all([ ger.event(ns, 'p1','view','a'), ger.event(ns, 'p2','view','a'), ger.event(ns, 'p3','view','a'), ger.event(ns, 'p1','view','c', expires_at: tomorrow), ger.event(ns, 'p2','view','b', expires_at: tomorrow), ger.event(ns, 'p3','view','b', expires_at: tomorrow), ]) .then(-> ger.recommendations_for_thing(ns, 'a', actions: {view: 1})) .then((recs) -> # a and b are very similar as they have recs = recs.recommendations recs.length.should.equal 2 recs[0].thing.should.equal 'b' recs[1].thing.should.equal 'c' recs[0].weight.should.be.greaterThan(recs[1].weight) ) it 'should not just recommend the popular things', -> init_ger(ESM) .then (ger) -> bb.all([ ger.event(ns, 'p1','view','a', expires_at: tomorrow), ger.event(ns, 'p1','view','b', expires_at: tomorrow), ger.event(ns, 'p2','view','a', expires_at: tomorrow), ger.event(ns, 'p2','view','b', expires_at: tomorrow), ger.event(ns, 'p3','view','a', expires_at: tomorrow), ger.event(ns, 'p3','view','c', expires_at: tomorrow), ger.event(ns, 'p4','view','c', expires_at: tomorrow), ger.event(ns, 'p5','view','c', expires_at: tomorrow), ger.event(ns, 'p6','view','c', expires_at: tomorrow), ]) .then(-> ger.recommendations_for_thing(ns, 'a', actions: {view: 1})) .then((recs) -> # a and b are very similar as they have recs = recs.recommendations recs.length.should.equal 2 recs[0].thing.should.equal 'b' recs[1].thing.should.equal 'c' recs[0].weight.should.be.greaterThan(recs[1].weight) ) describe 'thing exploits', -> it 'should not be altered by a single person doing the same thing a lot', -> init_ger(ESM) .then (ger) -> events = [] for x in [1..100] events.push ger.event(ns, "bad_person",'view','t2', expires_at: tomorrow) events.push ger.event(ns, "bad_person",'buy','t2', expires_at: tomorrow) bb.all(events) .then( -> bb.all([ ger.event(ns, 'bad_person', 'view', 't1') ger.event(ns, 'real_person', 'view', 't1') ger.event(ns, 'real_person', 'view', 't3', expires_at: tomorrow) ger.event(ns, 'real_person', 'buy', 't3', expires_at: tomorrow) ]) ) .then( -> ger.recommendations_for_thing(ns, 't1', actions: {buy:1, view:1}) ) .then((recs) -> item_weights = recs.recommendations temp = {} (temp[tw.thing] = tw.weight for tw in item_weights) temp['t2'].should.equal temp['t3'] ) it 'should not return any recommendations if none are there', -> init_ger(ESM) .then (ger) -> bb.all([ ger.event(ns, 'p1','view','a') ]) .then(-> ger.recommendations_for_thing(ns, 'a', actions: {view: 1})) .then((recs) -> recs.recommendations.length.should.equal 0 throw "BAD Confidence #{recommendations_object.confidence}" if not _.isFinite(recs.confidence) ) describe 'time_until_expiry', -> it 'should not return recommendations that will expire within time_until_expiry seconds', -> one_hour = 60*60 one_day = 24*one_hour a1day = moment().add(1, 'days').format() a2days = moment().add(2, 'days').format() a3days = moment().add(3, 'days').format() init_ger(ESM) .then (ger) -> bb.all([ ger.event(ns, 'p1','view','a'), ger.event(ns, 'p1','buy','x', expires_at: a1day), ger.event(ns, 'p1','buy','y', expires_at: a2days), ger.event(ns, 'p1','buy','z', expires_at: a3days) ]) .then(-> ger.recommendations_for_thing(ns, 'a', time_until_expiry: (one_day + one_hour), actions: {view: 1, buy: 1})) .then((recs) -> recs = recs.recommendations recs.length.should.equal 2 sorted_recs = [recs[0].thing, recs[1].thing].sort() sorted_recs[0].should.equal 'y' sorted_recs[1].should.equal 'z' ) describe "confidence", -> it 'should return a confidence ', -> init_ger(ESM) .then (ger) -> bb.all([ ger.event(ns, 'p1','a','t1'), ger.event(ns, 'p2','a','t2', expires_at: tomorrow), ]) .then(-> ger.recommendations_for_thing(ns, 't1', actions: {a: 1})) .then((recs) -> recs.confidence.should.exist _.isFinite(recs.confidence).should.equal true ) describe "weights", -> it "weights should determine the order of the recommendations", -> init_ger(ESM) .then (ger) -> bb.all([ ger.event(ns, 'p1','view','a'), ger.event(ns, 'p2','buy','a'), ger.event(ns, 'p1','view','b', expires_at: tomorrow) ger.event(ns, 'p2','view','c', expires_at: tomorrow) ]) .then(-> ger.recommendations_for_thing(ns, 'a', actions: {view: 1, buy: 1})) .then((recs) -> item_weights = recs.recommendations item_weights.length.should.equal 2 item_weights[0].weight.should.equal item_weights[1].weight ger.recommendations_for_thing(ns, 'a', actions: {view: 1, buy: 2}) ) .then((recs) -> item_weights = recs.recommendations item_weights[0].weight.should.be.greaterThan item_weights[1].weight item_weights[0].thing.should.equal 'c' item_weights[1].thing.should.equal 'b' ) module.exports = ger_tests;