fixed minor empty-arg validation bug

added missing empty-arg on enqueue test
added test coverage util

.gitignore

@@ -3,3 +3,5 @@
 **/node_modules
 **/npm-debug.log
 **/.idea
+**/coverage
+**/reports

index.js

@@ -9,14 +9,15 @@ module.exports = class IQ {
         this._members = members;
     }
     enqueue(o, friend = false) {
-        const oKey = o?(typeof o==='object')?hash(o):o:false,
+        if (!o) return false;
+        const oKey = (typeof o==='object')?hash(o):o,
             friendKey = friend?(typeof friend==='object')?hash(friend):friend:false;
-        this._members[oKey] = !!(this._members[oKey]) ? ++(this._members[oKey]) : 1;
+        this._members[oKey] = (this._members[oKey]) ? ++(this._members[oKey]) : 1;
         if (friend && this._members[friendKey]) {
             let index = (typeof friend==='object')?false:(this._queue.indexOf(friend))+1;
             if (index) {
                 this._queue.splice(index, 0, o);
-                return index + 1;
+                return ++index;
             }
             index = _.findIndex(this._queue, (member) => {
                 return hash(member)==friendKey;

package.json

@@ -1,24 +1,30 @@
 {
   "name": "israeli-queue",
-  "version": "1.1.0",
+  "version": "1.1.1",
   "description": "in-memory israeli-queue influenced by: http://www.math.tau.ac.il/~uriy/Papers/IQ-with-Priorities.pdf",
   "main": "index.js",
-  "scripts": {
-    "test": "mocha"
-  },
   "author": "Dror Arazi <dror@sealights.io> (www.sealights.io)",
   "license": "MIT",
   "repository": {
     "type": "git",
     "url": "https://github.com/Sealights/israeli-queue.git"
   },
+  "scripts": {
+    "test": "mocha",
+    "cover": "istanbul cover --report html node_modules/mocha/bin/_mocha  -- -R spec",
+    "mutate": "stryker run stryker.conf.js"
+  },
   "dependencies": {
     "lodash": "^4.17.4",
     "object-hash": "^1.1.5"
   },
   "devDependencies": {
     "chai": "^3.5.0",
-    "mocha": "^3.2.0"
+    "mocha": "^3.2.0",
+    "stryker": "^0.5.7",
+    "stryker-api": "^0.4.2",
+    "stryker-html-reporter": "^0.3.0",
+    "stryker-mocha-runner": "^0.2.0"
   },
   "keywords": [
     "israeli",

stryker.conf.js

@@ -0,0 +1,13 @@
+module.exports = function (config) {
+    config.set({
+        files: [
+            {pattern: './index.js', mutated: true, included: false},
+            './test/test.js'
+        ],
+        testRunner: 'mocha',
+        testFramework: 'mocha',
+        coverageAnalysis: 'perTest',
+        reporter: ['html', 'progress'],
+        logLevel: 'debug'
+    });
+};

test/test.js

@@ -13,6 +13,17 @@ describe('IQ', () => {
             queue = new IQ();
         });
 
+        it('no member', () => {
+            queue.enqueue();
+            queue.enqueue(undefined, undefined);
+
+            queue.length().should.equal(0);
+            queue.peek().should.equal(false);
+            queue.dequeue().should.equal(false);
+
+            queue.toString().should.equal("[]");
+        });
+
         it('one simple member', () => {
             queue.enqueue(1);