diff --git a/package-lock.json b/package-lock.json
index 91d5c5f..8a7fb60 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -373,6 +373,51 @@
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+      "resolved": "https://registry.npmjs.org/@sinonjs/fake-timers/-/fake-timers-6.0.1.tgz",
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+      "requires": {
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+      "resolved": "https://registry.npmjs.org/@sinonjs/samsam/-/samsam-5.0.3.tgz",
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+      "dev": true,
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@@ -446,6 +491,12 @@
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+          "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-7.0.3.tgz",
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+        "has": "^1.0.3",
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@@ -1360,6 +1548,24 @@
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@@ -1578,17 +1808,38 @@
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+      "resolved": "https://registry.npmjs.org/is-callable/-/is-callable-1.1.5.tgz",
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@@ -1813,6 +2076,12 @@
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@@ -1902,6 +2171,15 @@
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+    "string.prototype.trimstart": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/string.prototype.trimstart/-/string.prototype.trimstart-1.0.0.tgz",
+      "integrity": "sha512-iCP8g01NFYiiBOnwG1Xc3WZLyoo+RuBymwIlWncShXDDJYWN6DbnM3odslBJdgCdRlq94B5s63NWAZlcn2CS4w==",
+      "dev": true,
+      "requires": {
+        "define-properties": "^1.1.3",
+        "es-abstract": "^1.17.5"
+      }
+    },
     "string_decoder": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
@@ -3274,6 +3900,12 @@
         "prelude-ls": "~1.1.2"
       }
     },
+    "type-detect": {
+      "version": "4.0.8",
+      "resolved": "https://registry.npmjs.org/type-detect/-/type-detect-4.0.8.tgz",
+      "integrity": "sha512-0fr/mIH1dlO+x7TlcMy+bIDqKPsw/70tVyeHW787goQjhmqaZe10uwLujubK9q9Lg6Fiho1KUKDYz0Z7k7g5/g==",
+      "dev": true
+    },
     "type-fest": {
       "version": "0.8.1",
       "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.8.1.tgz",
@@ -3406,6 +4038,12 @@
         "isexe": "^2.0.0"
       }
     },
+    "which-module": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/which-module/-/which-module-2.0.0.tgz",
+      "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=",
+      "dev": true
+    },
     "wide-align": {
       "version": "1.1.3",
       "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.3.tgz",
@@ -3429,6 +4067,51 @@
       "integrity": "sha512-Hz/mrNwitNRh/HUAtM/VT/5VH+ygD6DV7mYKZAtHOrbs8U7lvPS6xf7EJKMF0uW1KJCl0H701g3ZGus+muE5vQ==",
       "dev": true
     },
+    "wrap-ansi": {
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-5.1.0.tgz",
+      "integrity": "sha512-QC1/iN/2/RPVJ5jYK8BGttj5z83LmSKmvbvrXPNCLZSEb32KKVDJDl/MOt2N01qU2H/FkzEa9PKto1BqDjtd7Q==",
+      "dev": true,
+      "requires": {
+        "ansi-styles": "^3.2.0",
+        "string-width": "^3.0.0",
+        "strip-ansi": "^5.0.0"
+      },
+      "dependencies": {
+        "ansi-regex": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
+          "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
+          "dev": true
+        },
+        "emoji-regex": {
+          "version": "7.0.3",
+          "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-7.0.3.tgz",
+          "integrity": "sha512-CwBLREIQ7LvYFB0WyRvwhq5N5qPhc6PMjD6bYggFlI5YyDgl+0vxq5VHbMOFqLg7hfWzmu8T5Z1QofhmTIhItA==",
+          "dev": true
+        },
+        "string-width": {
+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
+          "integrity": "sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==",
+          "dev": true,
+          "requires": {
+            "emoji-regex": "^7.0.1",
+            "is-fullwidth-code-point": "^2.0.0",
+            "strip-ansi": "^5.1.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "5.2.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
+          "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^4.1.0"
+          }
+        }
+      }
+    },
     "wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
@@ -3495,11 +4178,98 @@
       "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",
       "integrity": "sha512-LKYU1iAXJXUgAXn9URjiu+MWhyUXHsvfp7mcuYm9dSUKK0/CjtrUwFAxD82/mCWbtLsGjFIad0wIsod4zrTAEQ=="
     },
+    "y18n": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
+      "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==",
+      "dev": true
+    },
     "yallist": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
       "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=",
       "dev": true
+    },
+    "yargs": {
+      "version": "13.3.2",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.3.2.tgz",
+      "integrity": "sha512-AX3Zw5iPruN5ie6xGRIDgqkT+ZhnRlZMLMHAs8tg7nRruy2Nb+i5o9bwghAogtM08q1dpr2LVoS8KSTMYpWXUw==",
+      "dev": true,
+      "requires": {
+        "cliui": "^5.0.0",
+        "find-up": "^3.0.0",
+        "get-caller-file": "^2.0.1",
+        "require-directory": "^2.1.1",
+        "require-main-filename": "^2.0.0",
+        "set-blocking": "^2.0.0",
+        "string-width": "^3.0.0",
+        "which-module": "^2.0.0",
+        "y18n": "^4.0.0",
+        "yargs-parser": "^13.1.2"
+      },
+      "dependencies": {
+        "ansi-regex": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
+          "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
+          "dev": true
+        },
+        "emoji-regex": {
+          "version": "7.0.3",
+          "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-7.0.3.tgz",
+          "integrity": "sha512-CwBLREIQ7LvYFB0WyRvwhq5N5qPhc6PMjD6bYggFlI5YyDgl+0vxq5VHbMOFqLg7hfWzmu8T5Z1QofhmTIhItA==",
+          "dev": true
+        },
+        "string-width": {
+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
+          "integrity": "sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==",
+          "dev": true,
+          "requires": {
+            "emoji-regex": "^7.0.1",
+            "is-fullwidth-code-point": "^2.0.0",
+            "strip-ansi": "^5.1.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "5.2.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
+          "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^4.1.0"
+          }
+        }
+      }
+    },
+    "yargs-parser": {
+      "version": "13.1.2",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.2.tgz",
+      "integrity": "sha512-3lbsNRf/j+A4QuSZfDRA7HRSfWrzO0YjqTJd5kjAq37Zep1CEgaYmrH9Q3GwPiB9cHyd1Y1UwggGhJGoxipbzg==",
+      "dev": true,
+      "requires": {
+        "camelcase": "^5.0.0",
+        "decamelize": "^1.2.0"
+      },
+      "dependencies": {
+        "camelcase": {
+          "version": "5.3.1",
+          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-5.3.1.tgz",
+          "integrity": "sha512-L28STB170nwWS63UjtlEOE3dldQApaJXZkOI1uMFfzf3rRuPegHaHesyee+YxQ+W6SvRDQV6UrdOdRiR153wJg==",
+          "dev": true
+        }
+      }
+    },
+    "yargs-unparser": {
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/yargs-unparser/-/yargs-unparser-1.6.0.tgz",
+      "integrity": "sha512-W9tKgmSn0DpSatfri0nx52Joq5hVXgeLiqR/5G0sZNDoLZFOr/xjBUDcShCOGNsBnEMNo1KAMBkTej1Hm62HTw==",
+      "dev": true,
+      "requires": {
+        "flat": "^4.1.0",
+        "lodash": "^4.17.15",
+        "yargs": "^13.3.0"
+      }
     }
   }
 }
diff --git a/package.json b/package.json
index dd61707..465b996 100644
--- a/package.json
+++ b/package.json
@@ -13,7 +13,7 @@
     "server": "nodemon src/start.js --ignore dev/ --ignore public/ --ignore src/client/ --ignore dist/client/",
     "rollup:dev": "NODE_ENV=development; rollup -c -w",
     "rollup:build": "NODE_ENV=production; rollup -c",
-    "test": "node test/test-server.js"
+    "test": "mocha"
   },
   "keywords": [
     "Captcha",
@@ -36,10 +36,13 @@
   "devDependencies": {
     "@rollup/plugin-commonjs": "~11.0.2",
     "@rollup/plugin-node-resolve": "~7.1.1",
+    "chai": "^4.2.0",
     "eslint": "~6.8.0",
     "eslint-config-google": "~0.14.0",
+    "mocha": "^7.1.1",
     "nodemon": "~2.0.2",
     "rollup": "~2.0.6",
-    "rollup-plugin-terser": "~5.3.0"
+    "rollup-plugin-terser": "~5.3.0",
+    "sinon": "^9.0.1"
   }
 }
diff --git a/src/client/helpers/reloadSession.js b/src/client/helpers/reloadSession.js
index a86b9ed..a98298f 100644
--- a/src/client/helpers/reloadSession.js
+++ b/src/client/helpers/reloadSession.js
@@ -1,5 +1,4 @@
 import request from '../util/request.js';
-import logger from '../../helpers/logging.js';
 
 /**
  * @typedef {import('../../models/Session.js').Session} Session
@@ -12,7 +11,7 @@ import logger from '../../helpers/logging.js';
 export default async function reloadSession(websiteKey) {
   /** @type {Session} */
   const session = await request(`/api/reload?k=${websiteKey}`);
-  logger.debug({session});
+  console.info({session});
 
   return session;
 }
diff --git a/src/helpers/express-router.js b/src/helpers/express-router.js
deleted file mode 100644
index fd78d75..0000000
--- a/src/helpers/express-router.js
+++ /dev/null
@@ -1,14 +0,0 @@
-// Reduces errors till express is fixed
-import express from 'express';
-/**
- * @type {express.Router}
- * @property {function} get
- */
-export class Router {
-  /**
-   *
-   */
-  constructor() {
-    return express.Router();
-  }
-}
diff --git a/src/helpers/fetchImagesJob.js b/src/helpers/fetchImagesJob.js
index 30c0633..349ec39 100644
--- a/src/helpers/fetchImagesJob.js
+++ b/src/helpers/fetchImagesJob.js
@@ -6,7 +6,7 @@ import fs from 'fs';
 
 import db from './db/index.js';
 import {IMAGES_FOLDER} from '../R.js';
-import {randomBytes} from '../helpers/utils.js';
+import utils from '../helpers/utils.js';
 
 const CronJob = cron.CronJob;
 
@@ -117,7 +117,7 @@ export function fetchImages(geoImageRequest) {
     /** @type {OSCResponse} */
     const json = JSON.parse(body);
     for (const item of (json).currentPageItems) {
-      const filename = `${randomBytes(12)}`;
+      const filename = `${utils.randomBytes(12)}`;
       const filepath = path.join(IMAGES_FOLDER, filename + '.jpg');
       await saveImage(filepath, `https://openstreetcam.org/${item.lth_name}`);
       await db.setMat({
diff --git a/src/helpers/pickRandomFile.js b/src/helpers/pickRandomFile.js
index 9cbf6ce..02d371c 100644
--- a/src/helpers/pickRandomFile.js
+++ b/src/helpers/pickRandomFile.js
@@ -1,6 +1,6 @@
 import fs from 'fs';
 import {IMAGES_FOLDER} from '../R.js';
-import {randomChoice} from '../helpers/utils.js';
+import utils from '../helpers/utils.js';
 import logger from './logging.js';
 
 /**
@@ -11,7 +11,7 @@ export default () => {
     fs.readdir(IMAGES_FOLDER, (err, files)=>{
       if (err) return reject(err);
 
-      const filename = randomChoice(files);
+      const filename = utils.randomChoice(files);
       logger.debug({filename});
 
       return resolve(filename);
diff --git a/src/helpers/reloadSession.js b/src/helpers/reloadSession.js
index 360752a..102ea1b 100644
--- a/src/helpers/reloadSession.js
+++ b/src/helpers/reloadSession.js
@@ -1,5 +1,5 @@
 import pickRandomFile from './pickRandomFile.js';
-import {randomBytes} from './utils.js';
+import utils from './utils.js';
 import db from '../helpers/db/index.js';
 import {TAGS, MAX_SESSION_TIME} from '../R.js';
 
@@ -14,7 +14,7 @@ import {TAGS, MAX_SESSION_TIME} from '../R.js';
  */
 export default async function initializeSession(websiteKey, cookies) {
   const image = (await pickRandomFile()).split('.')[0];
-  const sessionId = cookies[websiteKey] || randomBytes(8);
+  const sessionId = cookies[websiteKey] || utils.randomBytes(8);
 
   const dbSession = await db.getSession(sessionId);
 
diff --git a/src/helpers/utils.js b/src/helpers/utils.js
index b5c9a59..dcf6eb2 100644
--- a/src/helpers/utils.js
+++ b/src/helpers/utils.js
@@ -47,7 +47,7 @@ function randomChoice(arr) {
   ];
 }
 
-export {
+export default {
   randomBytes,
   argmaxThresh,
   randomChoice,
diff --git a/src/helpers/verifyImage.js b/src/helpers/verifyImage.js
index 301e276..313af38 100644
--- a/src/helpers/verifyImage.js
+++ b/src/helpers/verifyImage.js
@@ -1,4 +1,4 @@
-import {randomBytes} from './utils.js';
+import utils from './utils.js';
 import db from '../helpers/db/index.js';
 import {
   MAX_SESSION_TIME,
@@ -7,7 +7,6 @@ import {
   MAT_TOLERANCE,
   SCORE_TOLERANCE,
 } from '../R.js';
-import {argmaxThresh} from './utils.js';
 import pickRandomFile from './pickRandomFile.js';
 import logger from './logging.js';
 
@@ -74,8 +73,8 @@ export default async function verifyImage(sessionId, userMat) {
 
   const imageMat = await db.getMat(image);
   logger.debug({imageMat});
-  const trueArgmax = argmaxThresh(imageMat.mat, MAT_TOLERANCE).join(',');
-  const userArgmax = argmaxThresh(userMat, 1).join(',');
+  const trueArgmax = utils.argmaxThresh(imageMat.mat, MAT_TOLERANCE).join(',');
+  const userArgmax = utils.argmaxThresh(userMat, 1).join(',');
 
   updateMat(imageMat, userMat, image);
 
@@ -94,7 +93,7 @@ export default async function verifyImage(sessionId, userMat) {
   }
 
   if (score >= SCORE_TOLERANCE) {
-    const nonce = randomBytes(24);
+    const nonce = utils.randomBytes(24);
     session.token = nonce;
 
     await db.deleteSession(sessionId);
diff --git a/test/test-server.js b/test/test-server.js
deleted file mode 100644
index 5570961..0000000
--- a/test/test-server.js
+++ /dev/null
@@ -1,2 +0,0 @@
-import {app} from '../src/server.js'
-console.log(app)
diff --git a/test/utils.test.js b/test/utils.test.js
new file mode 100644
index 0000000..28dfb03
--- /dev/null
+++ b/test/utils.test.js
@@ -0,0 +1,23 @@
+import utils from '../src/helpers/utils.js';
+import chai from 'chai';
+
+const {assert} = chai;
+
+describe('utils', ()=>{
+  describe('#argmaxThresh', ()=>{
+    it('should give correct argmax with threshold', (done)=>{
+      assert.sameMembers(
+        utils.argmaxThresh([0, 0, 1, 0.3, 0.6, 0.5, 0.9999], 0.56), [2, 4, 6]);
+      done();
+    })
+  });
+
+  describe('#randomBytes', ()=>{
+    it('should create random values', (done)=>{
+      const rand1 = utils.randomBytes(8);
+      const rand2 = utils.randomBytes(8);
+      assert.notEqual(rand1, rand2);
+      done()
+    });
+  });
+});