diff --git a/package.json b/package.json
index 30c4bf8..f2811fe 100644
--- a/package.json
+++ b/package.json
@@ -184,6 +184,7 @@
     "less-loader": "^4.1.0",
     "mini-css-extract-plugin": "^0.4.1",
     "mocha": "^5.2.0",
+    "mock-require": "^3.0.3",
     "optimize-css-assets-webpack-plugin": "^5.0.0",
     "script-loader": "^0.7.2",
     "string-loader": "^0.0.1",
diff --git a/test/csp.js b/test/csp.js
new file mode 100644
index 0000000..a6de68a
--- /dev/null
+++ b/test/csp.js
@@ -0,0 +1,124 @@
+/* eslint-env node, mocha */
+'use strict'
+
+const assert = require('assert')
+const crypto = require('crypto')
+const fs = require('fs')
+const path = require('path')
+const mock = require('mock-require')
+
+describe('Content security policies', function () {
+  let defaultConfig, csp
+
+  before(function () {
+    csp = require('../lib/csp')
+  })
+
+  beforeEach(function () {
+    // Reset config to make sure we don't influence other tests
+    defaultConfig = {
+      csp: {
+        enable: true,
+        directives: {
+        },
+        addDefaults: true,
+        addDisqus: true,
+        addGoogleAnalytics: true,
+        upgradeInsecureRequests: 'auto',
+        reportURI: undefined
+      },
+      useCDN: true
+    }
+  })
+
+  afterEach(function () {
+    mock.stop('../lib/config')
+    csp = mock.reRequire('../lib/csp')
+  })
+
+  after(function () {
+    mock.stopAll()
+    csp = mock.reRequire('../lib/csp')
+  })
+
+  // beginnging Tests
+  it('Disable CDN', function () {
+    let testconfig = defaultConfig
+    testconfig.useCDN = false
+    mock('../lib/config', testconfig)
+    csp = mock.reRequire('../lib/csp')
+
+    assert(!csp.computeDirectives().scriptSrc.includes('https://cdnjs.cloudflare.com'))
+    assert(!csp.computeDirectives().scriptSrc.includes('https://cdn.mathjax.org'))
+    assert(!csp.computeDirectives().styleSrc.includes('https://cdnjs.cloudflare.com'))
+    assert(!csp.computeDirectives().styleSrc.includes('https://fonts.googleapis.com'))
+    assert(!csp.computeDirectives().fontSrc.includes('https://cdnjs.cloudflare.com'))
+    assert(!csp.computeDirectives().fontSrc.includes('https://fonts.gstatic.com'))
+  })
+
+  it('Disable Google Analytics', function () {
+    let testconfig = defaultConfig
+    testconfig.csp.addGoogleAnalytics = false
+    mock('../lib/config', testconfig)
+    csp = mock.reRequire('../lib/csp')
+
+    assert(!csp.computeDirectives().scriptSrc.includes('https://www.google-analytics.com'))
+  })
+
+  it('Disable Disqus', function () {
+    let testconfig = defaultConfig
+    testconfig.csp.addDisqus = false
+    mock('../lib/config', testconfig)
+    csp = mock.reRequire('../lib/csp')
+
+    assert(!csp.computeDirectives().scriptSrc.includes('https://disqus.com'))
+    assert(!csp.computeDirectives().scriptSrc.includes('https://*.disqus.com'))
+    assert(!csp.computeDirectives().scriptSrc.includes('https://*.disquscdn.com'))
+    assert(!csp.computeDirectives().styleSrc.includes('https://*.disquscdn.com'))
+    assert(!csp.computeDirectives().fontSrc.includes('https://*.disquscdn.com'))
+  })
+
+  it('Set ReportURI', function () {
+    let testconfig = defaultConfig
+    testconfig.csp.reportURI = 'https://example.com/reportURI'
+    mock('../lib/config', testconfig)
+    csp = mock.reRequire('../lib/csp')
+
+    assert.strictEqual(csp.computeDirectives().reportUri, 'https://example.com/reportURI')
+  })
+
+  it('Set own directives', function () {
+    let testconfig = defaultConfig
+    mock('../lib/config', defaultConfig)
+    csp = mock.reRequire('../lib/csp')
+    const unextendedCSP = csp.computeDirectives()
+    testconfig.csp.directives = {
+      defaultSrc: ['https://default.example.com'],
+      scriptSrc: ['https://script.example.com'],
+      imgSrc: ['https://img.example.com'],
+      styleSrc: ['https://style.example.com'],
+      fontSrc: ['https://font.example.com'],
+      objectSrc: ['https://object.example.com'],
+      mediaSrc: ['https://media.example.com'],
+      childSrc: ['https://child.example.com'],
+      connectSrc: ['https://connect.example.com']
+    }
+    mock('../lib/config', testconfig)
+    csp = mock.reRequire('../lib/csp')
+
+    const variations = ['default', 'script', 'img', 'style', 'font', 'object', 'media', 'child', 'connect']
+
+    for (let i = 0; i < variations.length; i++) {
+      assert.strictEqual(csp.computeDirectives()[variations[i] + 'Src'].toString(), ['https://' + variations[i] + '.example.com'].concat(unextendedCSP[variations[i] + 'Src']).toString())
+    }
+  })
+
+  /*
+   * This test reminds us to update the CSP hash for the speaker notes
+   */
+  it('Unchanged hash for reveal.js speaker notes plugin', function () {
+    const hash = crypto.createHash('sha1')
+    hash.update(fs.readFileSync(path.resolve(__dirname, '../node_modules/reveal.js/plugin/notes/notes.html'), 'utf8'), 'utf8')
+    assert.strictEqual(hash.digest('hex'), '471f3826880fac884a4a14faabc492bc854ae994')
+  })
+})