Add tests for GA

fixture/google-analytics/README.md

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+Hello.

fixture/google-analytics/docpress.json

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+{
+  "googleAnalytics": {
+    "id": "UA-12345678-1",
+    "domain": "docpress.github.io"
+  }
+}

fixture/google-analytics/metalsmith.js

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+var app = require('docpress-core/ms')(__dirname)
+  .use(require('docpress-core')())
+  .use(require('../../')())
+
+if (module.parent) {
+  module.exports = app
+} else {
+  app.build(function (err) { if (err) throw err })
+}

test/fixture/google_analytics_test.js

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+'use strict'
+
+const fixture = require('../support/fixture')
+const buildMs = require('../support/build_ms')
+
+describe('fixture/google-analytics:', function () {
+  let fx = fixture('google-analytics')
+  buildMs(fx.path('metalsmith.js'))
+
+  describe('index.html', function () {
+    before(function () {
+      this.data = fx.read('_docpress/index.html')
+    })
+
+    it('adds the GA isogram', function () {
+      expect(this.data).toInclude('function(d,o,c,p,r,e,s)')
+    })
+
+    it('adds the tracking ID', function () {
+      expect(this.data).toInclude('ga(\'create\',"UA-12345678-1",\'auto\')')
+    })
+  })
+})