add unit test, fix dev dependencies, add Makefile

Makefile

@@ -0,0 +1,4 @@
+test:
+	./node_modules/jasme/run.js
+lint:
+	node_modules/eslint/bin/eslint.js .

package.json

@@ -1,7 +1,7 @@
 {
   "name": "express-prom-bundle",
   "version": "1.0.0",
-  "description": "express middleware with standard prometheus metrics in one bundle",
+  "description": "express middleware with popular prometheus metrics in one bundle",
   "main": "src/index.js",
   "directories": {
     "test": "test"
@@ -16,6 +16,9 @@
     "prom-client": "^3.4.0"
   },
   "devDependencies": {
-    "eslint": "^2.8.0"
+    "eslint": "^2.8.0",
+    "express": "^4.13.4",
+    "jasme": "^4.1.1",
+    "supertest": "^1.2.0"
   }
 }

spec/indexSpec.js

@@ -0,0 +1,24 @@
+"use strict";
+/* eslint-env jasmine */
+
+let express = require("express"),
+    request = require("supertest"),
+    bundle = require("../");
+
+describe("index", () => {
+    const app = express();
+    
+    app.use(bundle({
+        prefix: "hello"
+    }));
+
+    it("/metrics returns up=1", done => {
+        request(app)
+            .get("/metrics")
+            .end((err, res) => {
+                expect(res.status).toBe(200);
+                expect(res.text).toMatch(/hello:up\s1/);
+                done();
+            });
+    });
+});

src/PrometheusHelper.js

@@ -1,9 +1,7 @@
 "use strict";
 
-const onFinished = require("on-finished");
-
 module.exports = class {
-    constructor(opts, promClient) {
+    constructor(opts) {
         this.opts = opts || {};
         this.promClient = this.opts.promClient || require("prom-client");
         this.metrics = {};