tests for query-chainer

spec/query-chainer.spec.js

+if(typeof require === 'function') {
+  const buster             = require("buster")
+      , QueryChainer       = require("../lib/query-chainer")
+      , CustomEventEmitter = require("../lib/emitters/custom-event-emitter")
+}
+
+buster.spec.expose()
+
+describe('QueryChainer', function() {
+  before(function() {
+    this.queryChainer = new QueryChainer()
+  })
+
+  describe('add', function() {
+    it('adds a new serial item if method is passed',   function() {
+      expect(this.queryChainer.serials.length).toEqual(0)
+      this.queryChainer.add({}, 'foo')
+      expect(this.queryChainer.serials.length).toEqual(1)
+    })
+
+    it('adds a new emitter if no method is passed', function() {
+      expect(this.queryChainer.emitters.length).toEqual(0)
+      this.queryChainer.add(new CustomEventEmitter())
+      expect(this.queryChainer.emitters.length).toEqual(1)
+    })
+  })
+
+  describe('run', function() {
+    it('finishes when all emitters are finished', function(done) {
+      var emitter1 = new CustomEventEmitter(function(e) { e.emit('success') })
+      var emitter2 = new CustomEventEmitter(function(e) { e.emit('success') })
+
+      this.queryChainer.add(emitter1)
+      this.queryChainer.add(emitter2)
+
+      this.queryChainer.run().success(function() {
+        assert(true)
+        done()
+      })
+
+      emitter1.run()
+      setTimeout(function() { emitter2.run() }, 100)
+    })
+
+    it("returns the result of the passed emitters", function(done) {
+      var emitter1 = new CustomEventEmitter(function(e) { e.emit('success', 1) })
+
+      this.queryChainer.add(emitter1)
+
+      this.queryChainer.run().success(function(results) {
+        expect(results).toBeDefined()
+        expect(results.length).toEqual(1)
+        expect(results[0]).toEqual(1)
+        done()
+      })
+
+      emitter1.run()
+    })
+
+    it("returns the result of the passed emitters in the order of the occurrence of adding the emitters", function(done) {
+      var emitter1 = new CustomEventEmitter(function(e) { e.emit('success', 1) })
+        , emitter2 = new CustomEventEmitter(function(e) { e.emit('success', 2) })
+        , emitter3 = new CustomEventEmitter(function(e) { e.emit('success', 3) })
+
+      this.queryChainer.add(emitter1)
+      this.queryChainer.add(emitter2)
+      this.queryChainer.add(emitter3)
+
+      this.queryChainer.run().success(function(results) {
+        expect(results.length).toEqual(3)
+        expect(results).toEqual([1,2,3])
+        done()
+      })
+
+      emitter2.run()
+      emitter1.run()
+      emitter3.run()
+    })
+  })
+})