diff --git a/asdasdasd b/asdasdasd
new file mode 100644
index 0000000..fed97c9
--- /dev/null
+++ b/asdasdasd
@@ -0,0 +1 @@
+any content
\ No newline at end of file
diff --git a/package.json b/package.json
index a4c32f6..006ce1c 100755
--- a/package.json
+++ b/package.json
@@ -25,9 +25,10 @@
         "readme": "node --harmony-async-await src/RenderReadMe.js",
         "start": "npm run babel && npm run less && npm run server",
         "dev": "watch 'npm start' src/ resumes/ less/",
-        "pdf": "npm run babel && npm run less && node --harmony-async-await src/ResumeToPdf.js",
+        "pdf": "npm run babel && npm run less && node --harmony-async-await src/generatePdfs.js",
         "lint": "eslint src/",
-        "test": "mocha"
+        "test": "mocha --harmony-async-await \"test/*.js\"",
+        "istanbul": "istanbul cover node_modules/.bin/_mocha -- -- -u exports test/**/* --harmony-async-await"
     },
     "dependencies": {
         "@typopro/web-montserrat": "3.4.9",
@@ -67,6 +68,7 @@
     },
     "devDependencies": {
         "eslint": "3.15.0",
+        "istanbul": "^0.4.5",
         "mocha": "3.2.0"
     }
 }
diff --git a/pdf/resume-grey-boxes.pdf b/pdf/resume-grey-boxes.pdf
index 9295c82..625e413 100755
Binary files a/pdf/resume-grey-boxes.pdf and b/pdf/resume-grey-boxes.pdf differ
diff --git a/pdf/resume-left-right.pdf b/pdf/resume-left-right.pdf
index aa8f27a..897ba71 100755
Binary files a/pdf/resume-left-right.pdf and b/pdf/resume-left-right.pdf differ
diff --git a/pdf/resume-oblique.pdf b/pdf/resume-oblique.pdf
index 4d3221c..a1add1b 100755
Binary files a/pdf/resume-oblique.pdf and b/pdf/resume-oblique.pdf differ
diff --git a/pdf/resume-side-bar.pdf b/pdf/resume-side-bar.pdf
index 77c10b4..618fb83 100755
Binary files a/pdf/resume-side-bar.pdf and b/pdf/resume-side-bar.pdf differ
diff --git a/pdf/resume-spotify.pdf b/pdf/resume-spotify.pdf
index 29c3132..8805823 100755
Binary files a/pdf/resume-spotify.pdf and b/pdf/resume-spotify.pdf differ
diff --git a/pdf/resume-wanted.pdf b/pdf/resume-wanted.pdf
index b3e601f..f4b7b9f 100755
Binary files a/pdf/resume-wanted.pdf and b/pdf/resume-wanted.pdf differ
diff --git a/src/ResumeToPdf.js b/src/ResumeToPdf.js
index 3e0cdb0..6e16a64 100755
--- a/src/ResumeToPdf.js
+++ b/src/ResumeToPdf.js
@@ -29,5 +29,4 @@ const ResumeToPdf = {
         await Server.kill();
     }
 };
-
-ResumeToPdf.convert();
+module.exports = ResumeToPdf;
diff --git a/src/Util.js b/src/Util.js
index 7c8453d..783c9fb 100755
--- a/src/Util.js
+++ b/src/Util.js
@@ -56,9 +56,9 @@ const Util = {
      * @param  {string} content content of file
      * @return {Promise}
      */
-    writeFile: function(dir, content) {
+    writeFile: async function(dir, content) {
         return new Promise((res, rej) => {
-            writeFile(dir, content, err => {
+            writeFile(dir, content, (err) => {
                 if (err) rej(err);
                 res();
             });
diff --git a/src/generatePdfs.js b/src/generatePdfs.js
new file mode 100644
index 0000000..36b0c59
--- /dev/null
+++ b/src/generatePdfs.js
@@ -0,0 +1,2 @@
+const ResumeToPdf = require('./ResumeToPdf');
+ResumeToPdf.convert();
diff --git a/test/ResumeToPdf.js b/test/ResumeToPdf.js
new file mode 100644
index 0000000..52c6768
--- /dev/null
+++ b/test/ResumeToPdf.js
@@ -0,0 +1,18 @@
+/* global it, describe */
+const assert = require('assert');
+const ResumeToPdf = require('../src/ResumeToPdf');
+describe('ResumeToPdf', () => {
+    describe('#electroshotScript()', () => {
+        it('should return a string to execute', () => {
+            const resume = 'resume-any';
+            const exec = ResumeToPdf.electroshotScript(resume);
+            assert(exec != null);
+            assert(exec.includes(resume));
+        });
+    });
+    describe('#convert()', () => {
+        it('should return a string to execute', () => {
+            // TODO write test with spy
+        });
+    });
+});
diff --git a/test/Server.js b/test/Server.js
new file mode 100644
index 0000000..e69de29
diff --git a/test/StyleCompiler.js b/test/StyleCompiler.js
new file mode 100644
index 0000000..6d951ab
--- /dev/null
+++ b/test/StyleCompiler.js
@@ -0,0 +1,64 @@
+/* global it, describe */
+const assert = require('assert');
+const StyleCompiler = require('../src/StyleCompiler');
+
+describe('StyleCompiler', () => {
+    describe('#compile()', () => {
+        it('should return a promise', () => {
+            const less = '@color: blue; h1{ color: @color; }';
+            const promise = StyleCompiler.compile(less);
+            assert(promise instanceof Promise);
+        });
+        describe('positive', () => {
+            it('should compile less to css', async() => {
+                const less = '@color: blue; h1{ color: @color; }';
+                const expected = 'h1 {\n  color: blue;\n}\n';
+                const css = await StyleCompiler.compile(less);
+                assert.equal(css, expected);
+
+            });
+            it('should not throw an error when compiling to css', () => {
+                const less = '@color: blue; h1{ color: @color; }';
+                StyleCompiler.compile(less)
+                    .catch(err => assert(err == null));
+            });
+        });
+        describe('negative', () => {
+            it('should throw an error if less is not correct', () => {
+                const less = '@color: blue; h1#asd+yx[]{ color: @color; }';
+                StyleCompiler.compile(less)
+                    .then(css => assert(css == null))
+                    .catch(err => assert(err != null));
+            });
+        });
+    });
+    describe('#minify()', () => {
+        it('should return a promise', () => {
+            const less = '@color: blue; h1{ color: @color; }';
+            const promise = StyleCompiler.compile(less);
+            assert(promise instanceof Promise);
+        });
+        describe('positive', () => {
+            it('should minify css', async() => {
+                const css = 'h1 {\n  color: blue;\n}\n';
+                const expected = 'h1{color:#00f}';
+                const minified = await StyleCompiler.minify(css);
+                assert.equal(minified.styles, expected);
+            });
+            it('should not throw an error when minifying css', () => {
+                const css = 'h1 {\n  color: blue;\n}\n';
+                StyleCompiler.compile(css)
+                    .catch(err => assert(err == null));
+            });
+        });
+        describe('negative', () => {
+            it('should throw an error if css is not correct', () => {
+                const css = 'h1 {\n  color: #yxcöklljasd+blue;\n}\n';
+                StyleCompiler.compile(css)
+                    .then(minified => assert(minified == null))
+                    .catch(err => assert(err != null));
+            });
+        });
+    });
+    // TODO test for .run()
+});
diff --git a/test/Util.js b/test/Util.js
index 5f24482..bc7fb62 100644
--- a/test/Util.js
+++ b/test/Util.js
@@ -23,6 +23,10 @@ describe('Util', () => {
         });
     });
     describe('#setTimeout', () => {
+        it('should return a promise', () => {
+            const promise = Util.setTimeout(200);
+            assert(promise instanceof Promise);
+        });
         it('should resolve promise after given amount of time', () => {
             const ms = 100;
             let resolved = false;
@@ -39,37 +43,77 @@ describe('Util', () => {
                 .catch(err => assert(err === null));
         });
     });
-    describe('#readFileContent', () => {
-        it('should resolve promise and return file content', () => {
+    describe('#readFileContent', async() => {
+        it('should return a promise', () => {
             const p = path.join(__dirname, './files/readFile.txt');
-            Util.readFileContent(p)
-                .then(content => assert(content.includes('any content to be read')));
+            const promise = Util.readFileContent(p);
+            assert(promise instanceof Promise);
         });
-        it('should reject promise and return error', () => {
-            const p = 'asdasdasd';
-            Util.readFileContent(p)
-                .then(content => assert(content === null))
-                .catch(err => assert(err != null));
+        describe('positive', () => {
+            it('should return file content if file exists', async() => {
+                const p = path.join(__dirname, './files/readFile.txt');
+                const content = await Util.readFileContent(p);
+                assert(content.includes('any content to be read'));
+            });
+            it('should not return any error if file exists', async() => {
+                const p = path.join(__dirname, './files/readFile.txt');
+                Util.readFileContent(p)
+                    .catch(err => assert(err == null));
+            });
+        });
+        describe('negative', () => {
+            it('should reject promise and return error if file does not exist', () => {
+                const p = 'asdasdasd';
+                Util.readFileContent(p)
+                    .then(content => assert(content === null))
+                    .catch(err => assert(err != null));
+            });
         });
     });
     describe('#writeFile', () => {
-        it('should resolve promise and write file content', () => {
+        it('should return a promise', () => {
             const p = path.join(__dirname, './files/writeFile.txt');
-            const content = 'alskldjaksldjaklsjdla' + Math.random();
-            Util.writeFile(p, content)
-                .then(() => {
-                    Util.readFileContent(p).then(c => {
+            const promise = Util.writeFile(p, 'any content');
+            assert(promise instanceof Promise);
+        });
+        describe('positive', () => {
+            it('should write file content if file exists and not throw any error', () => {
+                const p = path.join(__dirname, './files/writeFile.txt');
+                const content = 'alskldjaksldjaklsjdla' + Math.random();
+                Util.writeFile(p, content)
+                    .then(async() => {
+                        const c = await Util.readFileContent(p);
                         assert.equal(c, content);
-                    });
-                })
-                .catch(err => assert(err === null));
+                    })
+                    .catch(err => assert(err === null));
+            });
+        });
+        describe('negative', () => {
+            it('should reject promise and return error if file does not exist', () => {
+                const p = 'asdasdasd';
+                Util.writeFile(p, 'any content')
+                    .then()
+                    .catch(err => assert(err != null));
+            });
         });
     });
     describe('#execBash', () => {
-        it('should execute bash script and resolve promise', () => {
-            Util.execBash('echo "Hello world"')
-                .then()
-                .catch(err => assert(err === null));
+        it('should return a promise', () => {
+            const promise = Util.execBash('echo "Hello World"');
+            assert(promise instanceof Promise);
+        });
+        describe('positive', () => {
+            it('should execute bash script and resolve promise', () => {
+                Util.execBash('echo "Hello world"')
+                    .then()
+                    .catch(err => assert(err === null));
+            });
+        });
+        describe('negative', () => {
+            it('should try to execute false bash script and reject promise', () => {
+                Util.execBash('asdlkajsd!+##')
+                    .catch(err => assert(err != null));
+            });
         });
     });
 });
diff --git a/test/files/writeFile.txt b/test/files/writeFile.txt
index 062cbe9..3bb775a 100644
--- a/test/files/writeFile.txt
+++ b/test/files/writeFile.txt
@@ -1 +1 @@
-alskldjaksldjaklsjdla0.4894462079149253
\ No newline at end of file
+alskldjaksldjaklsjdla0.6817729887314716
\ No newline at end of file