diff --git a/.gitignore b/.gitignore
index e6143b4db7..8a7c8baf67 100644
--- a/.gitignore
+++ b/.gitignore
@@ -58,5 +58,8 @@ yarn.lock
 # Documents
 My Document.docx
 
-# Temporary folder 
-tmp
\ No newline at end of file
+# Temporary folder
+tmp
+
+# nyc
+.nyc_output
diff --git a/.nycrc b/.nycrc
new file mode 100644
index 0000000000..7c878bae51
--- /dev/null
+++ b/.nycrc
@@ -0,0 +1,25 @@
+{
+  "check-coverage": true,
+  "lines": 84.56,
+  "functions": 77.50,
+  "branches": 71.40,
+  "statements": 84.30,
+  "include": [
+    "src/**/*.ts"
+  ],
+  "exclude": [
+    "src/**/*.spec.ts"
+  ],
+  "reporter": [
+    "lcov",
+    "text",
+    "json"
+  ],
+  "extension": [
+    ".ts"
+  ],
+  "cache": true,
+  "all": true,
+  "instrument": false,
+  "sourceMap": true
+}
diff --git a/.travis.yml b/.travis.yml
index e50920c6db..e84682f2da 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,7 +6,7 @@ install:
   - npm install -g codecov
 script:
   - npm run lint
-  - npm test
+  - npm run test.coverage
   - npm run style
   - npm run build
   - npm run ts-node -- ./demo/demo1.ts
diff --git a/README.md b/README.md
index f387c41a14..f9120883e0 100644
--- a/README.md
+++ b/README.md
@@ -15,6 +15,7 @@
 [![Known Vulnerabilities][snky-image]][snky-url]
 [![Chat on Gitter][gitter-image]][gitter-url]
 [![PRs Welcome][pr-image]][pr-url]
+[![codecov][codecov-image]][codecov-url]
 
 <p align="center">
     <img src="https://i.imgur.com/H5FA1Qy.gif" alt="drawing" width="800"/>
@@ -81,3 +82,5 @@ Made with 💖
 [gitter-url]: https://gitter.im/docx-lib/Lobby
 [pr-image]: https://img.shields.io/badge/PRs-welcome-brightgreen.svg
 [pr-url]: http://makeapullrequest.com
+[codecov-image]: https://codecov.io/gh/dolanmiu/docx/branch/master/graph/badge.svg
+[codecov-url]: https://codecov.io/gh/dolanmiu/docx
diff --git a/package.json b/package.json
index 802c2bfb62..32fdc7a467 100644
--- a/package.json
+++ b/package.json
@@ -6,17 +6,17 @@
   "scripts": {
     "pretest": "rimraf ./build",
     "test": "mocha-webpack \"src/**/*.ts\"",
-    "test-watch": "mocha-webpack \"src/**/*.ts\" --watch",
+    "test.coverage": "nyc npm test",
+    "test.watch": "npm test -- --watch",
     "prepublishOnly": "npm run build",
     "lint": "tslint --project .",
     "build": "npm run webpack && npm run fix-types",
     "tsc": "rimraf ./build && tsc -p .",
     "webpack": "rimraf ./build && webpack",
-    "build.web": "webpack --config webpack.web.config.js",
     "demo": "npm run build && npm run ts-node ./demo",
     "typedoc": "typedoc src/index.ts",
     "style": "prettier -l \"src/**/*.ts\"",
-    "style.fix": "prettier \"src/**/*.ts\" --write",
+    "style.fix": "npm run style -- --write",
     "fix-types": "node types-absolute-fixer.js",
     "ts-node": "ts-node"
   },
@@ -67,9 +67,11 @@
     "awesome-typescript-loader": "^3.4.1",
     "chai": "^3.5.0",
     "glob": "^7.1.2",
+    "istanbul-instrumenter-loader": "^3.0.1",
     "jszip": "^3.1.5",
     "mocha": "^5.2.0",
     "mocha-webpack": "^1.0.1",
+    "nyc": "^13.1.0",
     "pre-commit": "^1.2.2",
     "prettier": "^1.12.1",
     "prompt": "^1.0.0",
diff --git a/webpack.config.js b/webpack.config.js
index 01ecff1540..40ec0b0d23 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -20,6 +20,14 @@ module.exports = {
                 test: /\.ts$/,
                 loaders: ["awesome-typescript-loader"],
             },
+            {
+                // For coverage testing
+                test: /\.(ts)/,
+                include: path.resolve("src"),
+                loader: "istanbul-instrumenter-loader",
+                enforce: "post",
+                exclude: [/node_modules/],
+            }
         ],
     },