diff --git a/.gitignore b/.gitignore
index 2dfbfc3697..c38cba70da 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 /build/
-/node_modules/
+/coverage/
 /dist/
+/node_modules/
diff --git a/.travis.yml b/.travis.yml
index 173b2289d0..09c0729eb7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,6 +8,8 @@ cache:
 before_script:
 - rm src/ol/renderer/webgl/*shader.js
 script: make ci
+after_success:
+- cat coverage/lcov.info | coveralls
 branches:
   only:
   - master
diff --git a/package.json b/package.json
index 987acd4c01..238e492a3c 100644
--- a/package.json
+++ b/package.json
@@ -68,6 +68,7 @@
     "jquery": "3.2.1",
     "jscodeshift": "^0.3.30",
     "karma": "^1.7.0",
+    "karma-coverage": "^1.1.1",
     "karma-chrome-launcher": "^2.1.1",
     "karma-firefox-launcher": "^1.0.1",
     "karma-mocha": "^1.3.0",
diff --git a/test/karma.config.js b/test/karma.config.js
index 3dd92e325a..0d7e250245 100644
--- a/test/karma.config.js
+++ b/test/karma.config.js
@@ -49,6 +49,25 @@ module.exports = function(karma) {
     proxies: {
       '/rendering/': '/base/rendering/',
       '/spec/': '/base/spec/'
+    },
+    preprocessors: {
+      // source files, that you wanna generate coverage for
+      // do not include tests or libraries
+      // (these files will be instrumented by Istanbul)
+      '../src/**/*.js': ['coverage']
+    },
+    reporters: ['progress', 'coverage'],
+    coverageReporter: {
+      reporters: [
+        {
+          type: 'lcov', // produces HTML output and lcov
+          dir: '../coverage/',
+          subdir: '.'
+        },
+        {
+          type: 'text-summary' // prints the textual summary to the terminal
+        }
+      ]
     }
   });
 
@@ -91,11 +110,23 @@ module.exports = function(karma) {
         username: 'openlayers',
         accessKey: process.env.SAUCE_ACCESS_KEY
       },
-      reporters: ['dots', 'saucelabs'],
+      reporters: ['dots', 'saucelabs', 'coverage'],
       captureTimeout: 240000,
       browserNoActivityTimeout: 240000,
       customLaunchers: customLaunchers,
-      browsers: Object.keys(customLaunchers)
+      browsers: Object.keys(customLaunchers),
+      coverageReporter: {
+        reporters: [
+          {
+            type: 'lcovonly', // that's enough for coveralls, no HTML
+            dir: '../coverage/',
+            subdir: '.'
+          },
+          {
+            type: 'text-summary' // prints the textual summary to the terminal
+          }
+        ]
+      }
     });
   } else {
     karma.set({
diff --git a/test/test-extensions.js b/test/test-extensions.js
index a3d45294fb..6811091eeb 100644
--- a/test/test-extensions.js
+++ b/test/test-extensions.js
@@ -502,7 +502,7 @@ goog.require('ol.renderer.webgl.Map');
     }
     return {
       describe: features[key] ? global.describe : global.xdescribe,
-      it: features[key] ? global.id : global.xit
+      it: features[key] ? global.it : global.xit
     };
   };