Ported the examples as test units, removed underscore

examples/counterAndGauge.js

@@ -9,7 +9,7 @@ var counter = client.newCounter({
     help: "The number of counter intervals that have elapsed."
 });
 
-gauge = client.newGauge({
+var gauge = client.newGauge({
     namespace: "counter_test",
     name: "random_number",
     help: "A random number we occasionally set."

package.json

@@ -12,7 +12,6 @@
         "node": ">=0.10.0"
     },
     "dependencies": {
-        "underscore":     "~1.7.0",
         "debug":          "~2.1.2",
         "express":        "~4.12.3",
         "object-hash":    "~0.5.0"

src/base_metric.coffee

@@ -1,5 +1,4 @@
 debug   = require("debug")("prometheus-client:metric")
-_       = require "underscore"
 hash    = require "object-hash"
 
 module.exports = class BaseMetric
@@ -21,7 +20,7 @@ module.exports = class BaseMetric
         throw "Name is required" if !@name
         throw "Help is required" if !@help
 
-        @_full_name     = _.compact([ @namespace, @subsystem, @name ]).join("_")
+        @_full_name     = [ @namespace, @subsystem, @name ].filter((s)->s).join("_")
 
     #----------
 
@@ -59,7 +58,7 @@ module.exports = class BaseMetric
         # Validate each label key
         for k,v of labels
             throw "Label #{k} must not start with __" if /^__/.test(k)
-            throw "Label #{k} is reserved" if _(['instance','job']).contains(k)
+            throw "Label #{k} is reserved" if 'instance'==k || 'job'==k
 
         # Validate that the set of keys is correct
         if @_labelKeys && hash.keys(labels) != @_labelKeys
@@ -69,4 +68,4 @@ module.exports = class BaseMetric
         @_labelKeys = hash.keys(labels) if !@_labelKeys
         @_labelCache[lh] = labels
 
-        lh
+        lh

src/client.coffee

@@ -1,6 +1,5 @@
 debug = require("debug")("prometheus-client")
 express = require "express"
-_ = require "underscore"
 
 module.exports = class Client
     @_globalRegistry:   null
@@ -46,4 +45,4 @@ module.exports = class Client
 
     #----------
 
-    #----------
+    #----------

test/common.coffee

@@ -2,4 +2,4 @@ chai            = require "chai"
 global.expect   = chai.expect
 
 path = require "path"
-global.$src     = (module) -> require path.resolve(__dirname,"..","lib",module)
+global.$src     = (module) -> require path.resolve(__dirname,"..","js",module)

test/metrics.coffee

@@ -0,0 +1,71 @@
+Prometheus = $src "client"
+Registry  = $src "registry"
+
+describe 'Counter', ->
+    client = null
+    counter = null
+    before ->
+        client = new Prometheus(registry: new Registry)
+
+        counter = client.newCounter({
+            namespace: "counter_test",
+            name: "elapsed_counters_total",
+            help: "The number of counter intervals that have elapsed."
+        })
+
+        counter.increment(period:"1sec")
+        counter.increment(period:"2sec")
+
+    it 'should generate some counter metrics', ->
+        lineCount = 0
+        lines=[
+            '# HELP counter_test_elapsed_counters_total The number of counter intervals that have elapsed.\n' +
+            '# TYPE counter_test_elapsed_counters_total counter\n',
+            'counter_test_elapsed_counters_total{period="1sec"} 1\n',
+            'counter_test_elapsed_counters_total{period="2sec"} 1\n'
+        ]
+        mockRes =
+            writeHead: (statusCode, header) ->
+                expect(statusCode).to.equal(200)
+                expect(header).to.deep.equal('content-type': 'text/plain; version=0.0.4')
+            write: (line) ->
+                expect(line).to.equal lines[lineCount]
+                lineCount++
+            end: () ->
+                expect(lineCount).to.equal lines.length
+
+        client.metricsFunc()(null, mockRes)
+
+describe 'Gauge', ->
+    client = null
+    gauge = null
+    before ->
+        client = new Prometheus(registry: new Registry)
+
+        gauge = client.newGauge({
+            namespace: "gauge_test",
+            name: "fixed_test_number",
+            help: "A few test numbers we set."
+        });
+
+        gauge.set({ period: "1sec" }, 123);
+        gauge.set({ period: "1sec" }, 456);
+
+    it 'should generate some gauge metrics', ->
+        lineCount = 0
+        lines=[
+            '# HELP gauge_test_fixed_test_number A few test numbers we set.\n' +
+            '# TYPE gauge_test_fixed_test_number gauge\n',
+            'gauge_test_fixed_test_number{period="1sec"} 456\n'
+        ]
+        mockRes =
+            writeHead: (statusCode, header) ->
+                expect(statusCode).to.equal(200)
+                expect(header).to.deep.equal('content-type': 'text/plain; version=0.0.4')
+            write: (line) ->
+                expect(line).to.equal lines[lineCount]
+                lineCount++
+            end: () ->
+                expect(lineCount).to.equal lines.length
+
+        client.metricsFunc()(null, mockRes)