initial commit

server/node_modules/lru-memoizer/test/lru-memoizer.events.test.js

@@ -0,0 +1,132 @@
+const memoizer = require('./..');
+const sinon = require('sinon');
+
+describe('lru-memoizer (events)', function () {
+  let memoized;
+  let onMiss, onHit, onQueue;
+
+  beforeEach(function () {
+    loadTimes = 0;
+    onMiss = sinon.stub();
+    onHit = sinon.stub();
+    onQueue = sinon.stub();
+    memoized = memoizer({
+      load: function (a, b, bypass, callback) {
+        return setTimeout(function () {
+          if (a === 0) {
+            return callback(new Error('a cant be 0'));
+          }
+          callback(null, a+b);
+        }, 10);
+      },
+      hash: function (a, b) {
+        return a + '-' + b;
+      },
+      bypass: function(a, b, bypass) {
+        return bypass;
+      },
+      max: 10
+    });
+    memoized.on('hit', onHit);
+    memoized.on('miss', onMiss);
+    memoized.on('queue', onQueue);
+  });
+
+  describe('when the result is not in the cache', () => {
+    beforeEach((done) => {
+      memoized(1, 2, false, done);
+    });
+
+    it('should not call onHit', () => {
+      sinon.assert.notCalled(onHit);
+    });
+
+    it('should not call onQueue', () => {
+      sinon.assert.notCalled(onQueue);
+    });
+
+    it('should call onMiss with the load arguments', () => {
+      sinon.assert.calledOnce(onMiss);
+      sinon.assert.calledWith(onMiss, 1, 2, false);
+    });
+  });
+
+  describe('when the result is in the cache', () => {
+    beforeEach((done) => {
+      memoized(1,2, false, () => {
+        onHit.reset();
+        onMiss.reset();
+        onQueue.reset();
+        memoized(1, 2, false, done);
+      });
+    });
+
+    it('should call onHit with the load arguments', () => {
+      sinon.assert.calledOnce(onHit);
+      sinon.assert.calledWith(onHit, 1, 2, false);
+    });
+
+    it('should not call onQueue', () => {
+      sinon.assert.notCalled(onQueue);
+    });
+
+    it('should not call onMiss', () => {
+      sinon.assert.notCalled(onQueue);
+    });
+  });
+
+  describe('when the cache is by passed', () => {
+    beforeEach((done) => {
+      memoized(1,2, false, () => {
+        onHit.reset();
+        onMiss.reset();
+        onQueue.reset();
+        memoized(1, 2, true, done);
+      });
+    });
+
+    it('should not call onHit', () => {
+      sinon.assert.notCalled(onHit);
+    });
+
+    it('should not call onQueue', () => {
+      sinon.assert.notCalled(onQueue);
+    });
+
+    it('should call onMiss with the load arguments', () => {
+      sinon.assert.calledOnce(onMiss);
+      sinon.assert.calledWith(onMiss, 1, 2, true);
+    });
+  });
+
+  describe('when the result is pending', () => {
+    beforeEach((done) => {
+      let pending = 2;
+      function onDone() {
+        pending -= 1;
+        if (pending === 0) {
+          done();
+        }
+      }
+      memoized(1, 2, false, onDone);
+      onHit.reset();
+      onMiss.reset();
+      onQueue.reset();
+      memoized(1, 2, false, onDone);
+    });
+
+    it('should not call onHit', () => {
+      sinon.assert.notCalled(onHit);
+    });
+
+    it('should call onQueue with the load arguments', () => {
+      sinon.assert.calledOnce(onQueue);
+      sinon.assert.calledWith(onQueue, 1, 2, false);
+    });
+
+    it('should not call onMiss', () => {
+      sinon.assert.notCalled(onMiss);
+    });
+  });
+});
+