diff --git a/.travis.yml b/.travis.yml
index ecc9a96f..72211b88 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,6 +2,12 @@ sudo: false
 language: node_js
 node_js:
   - "node"
+dist: trusty
+addons:
+  chrome: stable
+before_script:
+  - export DISPLAY=:99.0
+  - sh -e /etc/init.d/xvfb start
 cache:
   directories:
   - phantomjs
diff --git a/Makefile b/Makefile
index 3d3f2e72..d532c4db 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,4 @@
 test: lint dist/fetch.umd.js
-	./script/test
 
 lint: node_modules/
 	./node_modules/.bin/eslint --report-unused-disable-directives *.js test/*.js
diff --git a/package.json b/package.json
index 5153a7f4..94c31493 100644
--- a/package.json
+++ b/package.json
@@ -8,11 +8,15 @@
   "license": "MIT",
   "devDependencies": {
     "abortcontroller-polyfill": "^1.1.9",
-    "chai": "1.10.0",
+    "chai": "^4.1.2",
     "eslint": "^4.19.1",
     "eslint-plugin-github": "^1.0.0",
-    "mocha": "2.1.0",
-    "mocha-phantomjs-core": "2.0.1",
+    "karma": "^1.7.1",
+    "karma-chai": "^0.1.0",
+    "karma-chrome-launcher": "^2.2.0",
+    "karma-firefox-launcher": "^1.0.1",
+    "karma-mocha": "^1.3.0",
+    "mocha": "^4.0.1",
     "promise-polyfill": "6.0.2",
     "rollup": "^0.59.1",
     "url-search-params": "0.6.1"
@@ -24,6 +28,7 @@
   ],
   "scripts": {
     "prepublish": "make dist/fetch.umd.js",
-    "test": "make"
+    "pretest": "make",
+    "test": "karma start ./test/karma.config.js"
   }
 }
diff --git a/script/server b/script/server
deleted file mode 100755
index e89b9c91..00000000
--- a/script/server
+++ /dev/null
@@ -1,157 +0,0 @@
-#!/usr/bin/env node
-
-var port = Number(process.argv[2] || 3000)
-
-var fs = require('fs')
-var http = require('http');
-var url = require('url');
-var querystring = require('querystring');
-
-var routes = {
-  '/request': function(res, req) {
-    res.writeHead(200, {'Content-Type': 'application/json'});
-    var data = ''
-    req.on('data', function(c) { data += c })
-    req.on('end', function() {
-      res.end(JSON.stringify({
-        method: req.method,
-        url: req.url,
-        headers: req.headers,
-        data: data
-      }));
-    })
-  },
-  '/hello': function(res, req) {
-    res.writeHead(200, {
-      'Content-Type': 'text/plain',
-      'X-Request-URL': 'http://' + req.headers.host + req.url
-    });
-    res.end('hi');
-  },
-  '/hello/utf8': function(res) {
-    res.writeHead(200, {
-      'Content-Type': 'text/plain; charset=utf-8'
-    });
-    // "hello"
-    var buf = new Buffer([104, 101, 108, 108, 111]);
-    res.end(buf);
-  },
-  '/hello/utf16le': function(res) {
-    res.writeHead(200, {
-      'Content-Type': 'text/plain; charset=utf-16le'
-    });
-    // "hello"
-    var buf = new Buffer([104, 0, 101, 0, 108, 0, 108, 0, 111, 0]);
-    res.end(buf);
-  },
-  '/binary': function(res) {
-    res.writeHead(200, {'Content-Type': 'application/octet-stream'});
-    var buf = new Buffer(256);
-    for (var i = 0; i < 256; i++) {
-      buf[i] = i;
-    }
-    res.end(buf);
-  },
-  '/redirect/301': function(res) {
-    res.writeHead(301, {'Location': '/hello'});
-    res.end();
-  },
-  '/redirect/302': function(res) {
-    res.writeHead(302, {'Location': '/hello'});
-    res.end();
-  },
-  '/redirect/303': function(res) {
-    res.writeHead(303, {'Location': '/hello'});
-    res.end();
-  },
-  '/redirect/307': function(res) {
-    res.writeHead(307, {'Location': '/hello'});
-    res.end();
-  },
-  '/redirect/308': function(res) {
-    res.writeHead(308, {'Location': '/hello'});
-    res.end();
-  },
-  '/boom': function(res) {
-    res.writeHead(500, {'Content-Type': 'text/plain'});
-    res.end('boom');
-  },
-  '/empty': function(res) {
-    res.writeHead(204);
-    res.end();
-  },
-  '/slow': function(res) {
-    setTimeout(function() {
-      res.writeHead(200);
-      res.end();
-    }, 100);
-  },
-  '/error': function(res) {
-    res.destroy();
-  },
-  '/form': function(res) {
-    res.writeHead(200, {'Content-Type': 'application/x-www-form-urlencoded'});
-    res.end('number=1&space=one+two&empty=&encoded=a%2Bb&');
-  },
-  '/json': function(res) {
-    res.writeHead(200, {'Content-Type': 'application/json'});
-    res.end(JSON.stringify({name: 'Hubot', login: 'hubot'}));
-  },
-  '/json-error': function(res) {
-    res.writeHead(200, {'Content-Type': 'application/json'});
-    res.end('not json {');
-  },
-  '/cookie': function(res, req) {
-    var setCookie, cookie
-    var params = querystring.parse(url.parse(req.url).query);
-    if (params.name && params.value) {
-      setCookie = [params.name, params.value].join('=');
-    }
-    if (params.name) {
-      cookie = querystring.parse(req.headers['cookie'], '; ')[params.name];
-    }
-    res.writeHead(200, {
-      'Content-Type': 'text/plain',
-      'Set-Cookie': setCookie || ''
-    });
-    res.end(cookie);
-  },
-  '/headers': function(res) {
-    res.writeHead(200, {
-      'Date': 'Mon, 13 Oct 2014 21:02:27 GMT',
-      'Content-Type': 'text/html; charset=utf-8'
-    });
-    res.end();
-  }
-};
-
-var types = {
-  js: 'application/javascript',
-  css: 'text/css',
-  html: 'text/html',
-  txt: 'text/plain'
-};
-
-server = http.createServer(function(req, res) {
-  var pathname = url.parse(req.url).pathname;
-  var route = routes[pathname];
-  if (route) {
-    route(res, req);
-  } else {
-    if (pathname == '/') pathname = '/test/test.html'
-    fs.readFile(__dirname + '/..' + pathname, function(err, data) {
-      if (err) {
-        res.writeHead(404, {'Content-Type': types.txt});
-        res.end('Not Found');
-      } else {
-        var ext = (pathname.match(/\.([^\/]+)$/) || [])[1]
-        res.writeHead(200, {'Content-Type': types[ext] || types.txt});
-        res.end(data);
-      }
-    });
-  }
-});
-
-console.warn("Started test server on localhost:" + port);
-server.listen(port);
-
diff --git a/test/karma.config.js b/test/karma.config.js
new file mode 100644
index 00000000..600cdcb4
--- /dev/null
+++ b/test/karma.config.js
@@ -0,0 +1,39 @@
+const serverEndpoints = require('./server')
+
+module.exports = function(config) {
+  config.set({
+    frameworks: ['mocha', 'chai'],
+    client: {
+      mocha: {
+        ui: 'tdd'
+      }
+    },
+    files: ['../dist/fetch.umd.js', 'test.js'],
+    reporters: ['progress'],
+    port: 9876,
+    colors: true,
+    logLevel: config.LOG_INFO,
+    browsers: ['ChromeHeadlessNoSandbox', 'FirefoxHeadless'],
+    autoWatch: false,
+    singleRun: true,
+    concurrency: Infinity,
+    customLaunchers: {
+      ChromeHeadlessNoSandbox: {
+        base: 'ChromeHeadless',
+        flags: ['--no-sandbox']
+      },
+      FirefoxHeadless: {
+        base: 'Firefox',
+        flags: ['-headless'],
+        displayName: 'HeadlessFirefox'
+      }
+    },
+    beforeMiddleware: ['custom'],
+    plugins: [
+      'karma-*',
+      {
+        'middleware:custom': ['value', serverEndpoints]
+      }
+    ]
+  })
+}
diff --git a/test/server.js b/test/server.js
new file mode 100644
index 00000000..10036715
--- /dev/null
+++ b/test/server.js
@@ -0,0 +1,136 @@
+/* eslint-env node */
+
+const url = require('url')
+const querystring = require('querystring')
+
+const routes = {
+  '/request': function(res, req) {
+    res.writeHead(200, {'Content-Type': 'application/json'})
+    var data = ''
+    req.on('data', function(c) {
+      data += c
+    })
+    req.on('end', function() {
+      res.end(
+        JSON.stringify({
+          method: req.method,
+          url: req.url,
+          headers: req.headers,
+          data: data
+        })
+      )
+    })
+  },
+  '/hello': function(res, req) {
+    res.writeHead(200, {
+      'Content-Type': 'text/plain',
+      'X-Request-URL': 'http://' + req.headers.host + req.url
+    })
+    res.end('hi')
+  },
+  '/hello/utf8': function(res) {
+    res.writeHead(200, {
+      'Content-Type': 'text/plain; charset=utf-8'
+    })
+    // "hello"
+    var buf = new Buffer([104, 101, 108, 108, 111])
+    res.end(buf)
+  },
+  '/hello/utf16le': function(res) {
+    res.writeHead(200, {
+      'Content-Type': 'text/plain; charset=utf-16le'
+    })
+    // "hello"
+    var buf = new Buffer([104, 0, 101, 0, 108, 0, 108, 0, 111, 0])
+    res.end(buf)
+  },
+  '/binary': function(res) {
+    res.writeHead(200, {'Content-Type': 'application/octet-stream'})
+    var buf = new Buffer(256)
+    for (var i = 0; i < 256; i++) {
+      buf[i] = i
+    }
+    res.end(buf)
+  },
+  '/redirect/301': function(res) {
+    res.writeHead(301, {Location: '/hello'})
+    res.end()
+  },
+  '/redirect/302': function(res) {
+    res.writeHead(302, {Location: '/hello'})
+    res.end()
+  },
+  '/redirect/303': function(res) {
+    res.writeHead(303, {Location: '/hello'})
+    res.end()
+  },
+  '/redirect/307': function(res) {
+    res.writeHead(307, {Location: '/hello'})
+    res.end()
+  },
+  '/redirect/308': function(res) {
+    res.writeHead(308, {Location: '/hello'})
+    res.end()
+  },
+  '/boom': function(res) {
+    res.writeHead(500, {'Content-Type': 'text/plain'})
+    res.end('boom')
+  },
+  '/empty': function(res) {
+    res.writeHead(204)
+    res.end()
+  },
+  '/slow': function(res) {
+    setTimeout(function() {
+      res.writeHead(200)
+      res.end()
+    }, 100)
+  },
+  '/error': function(res) {
+    res.destroy()
+  },
+  '/form': function(res) {
+    res.writeHead(200, {'Content-Type': 'application/x-www-form-urlencoded'})
+    res.end('number=1&space=one+two&empty=&encoded=a%2Bb&')
+  },
+  '/json': function(res) {
+    res.writeHead(200, {'Content-Type': 'application/json'})
+    res.end(JSON.stringify({name: 'Hubot', login: 'hubot'}))
+  },
+  '/json-error': function(res) {
+    res.writeHead(200, {'Content-Type': 'application/json'})
+    res.end('not json {')
+  },
+  '/cookie': function(res, req) {
+    var setCookie, cookie
+    var params = querystring.parse(url.parse(req.url).query)
+    if (params.name && params.value) {
+      setCookie = [params.name, params.value].join('=')
+    }
+    if (params.name) {
+      cookie = querystring.parse(req.headers['cookie'], '; ')[params.name]
+    }
+    res.writeHead(200, {
+      'Content-Type': 'text/plain',
+      'Set-Cookie': setCookie || ''
+    })
+    res.end(cookie)
+  },
+  '/headers': function(res) {
+    res.writeHead(200, {
+      Date: 'Mon, 13 Oct 2014 21:02:27 GMT',
+      'Content-Type': 'text/html; charset=utf-8'
+    })
+    res.end()
+  }
+}
+
+module.exports = function(req, res, next) {
+  const path = url.parse(req.url).pathname
+  const route = routes[path]
+  if (route) {
+    route(res, req)
+  } else {
+    next()
+  }
+}