diff --git a/.eslintrc.js b/.eslintrc.js
index b28fdf4..d0344ab 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -18,6 +18,10 @@
   parserOptions: {
     parser: 'babel-eslint'
   },
+  globals: {
+    expect: true,
+    sinon: true
+  },
   overrides: [
     {
       files: [
@@ -25,7 +29,7 @@
         '**/tests/unit/**/*.spec.{j,t}s?(x)'
       ],
       env: {
-        jest: true
+        mocha: true
       }
     }
   ]
diff --git a/jest.config.js b/jest.config.js
deleted file mode 100644
index 8664800..0000000
--- a/jest.config.js
+++ /dev/null
@@ -1,3 +0,0 @@
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-  preset: '@vue/cli-plugin-unit-jest'
-};
diff --git a/package-lock.json b/package-lock.json
index bcd1bbc..8a80c69 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -936,9 +936,9 @@
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-        "chalk": "^2.1.0",
-        "extract-from-css": "^0.4.4",
-        "find-babel-config": "^1.1.0",
-        "js-beautify": "^1.6.14",
-        "node-cache": "^4.1.1",
-        "object-assign": "^4.1.1",
-        "source-map": "^0.5.6",
-        "tsconfig": "^7.0.0",
-        "vue-template-es2015-compiler": "^1.6.0"
-      }
-    },
     "vue-loader": {
       "version": "15.8.3",
       "resolved": "https://registry.npmjs.org/vue-loader/-/vue-loader-15.8.3.tgz",
@@ -16397,22 +16540,20 @@
       "integrity": "sha512-wLoqz0B7DSZtgbWL1ShIBBCjv22GV5U+vcBFox658g6V0s4wZV9P4YjCNyoHSyIBpj1f29JBoNQIqD82cR4O3w=="
     },
     "w3c-hr-time": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/w3c-hr-time/-/w3c-hr-time-1.0.1.tgz",
-      "integrity": "sha1-gqwr/2PZUOqeMYmlimViX+3xkEU=",
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/w3c-hr-time/-/w3c-hr-time-1.0.2.tgz",
+      "integrity": "sha512-z8P5DvDNjKDoFIHK7q8r8lackT6l+jo/Ye3HOle7l9nICP9lf1Ci25fy9vHd0JOWewkIFzXIEig3TdKT7JQ5fQ==",
       "dev": true,
       "requires": {
-        "browser-process-hrtime": "^0.1.2"
+        "browser-process-hrtime": "^1.0.0"
       }
     },
     "w3c-xmlserializer": {
-      "version": "1.1.2",
-      "resolved": "https://registry.npmjs.org/w3c-xmlserializer/-/w3c-xmlserializer-1.1.2.tgz",
-      "integrity": "sha512-p10l/ayESzrBMYWRID6xbuCKh2Fp77+sA0doRuGn4tTIMrrZVeqfpKjXHY+oDh3K4nLdPgNwMTVP6Vp4pvqbNg==",
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/w3c-xmlserializer/-/w3c-xmlserializer-2.0.0.tgz",
+      "integrity": "sha512-4tzD0mF8iSiMiNs30BiLO3EpfGLZUT2MSX/G+o7ZywDzliWQ3OPtTZ0PTC3B3ca1UAf4cJMHB+2Bf56EriJuRA==",
       "dev": true,
       "requires": {
-        "domexception": "^1.0.1",
-        "webidl-conversions": "^4.0.2",
         "xml-name-validator": "^3.0.0"
       }
     },
@@ -16455,9 +16596,9 @@
       }
     },
     "webidl-conversions": {
-      "version": "4.0.2",
-      "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-4.0.2.tgz",
-      "integrity": "sha512-YQ+BmxuTgd6UXZW3+ICGfyqRyHXVlD5GtQr5+qjiNW7bF0cqrzX500HVXPBOvgXb5YnzDd+h0zqyv61KUD7+Sg==",
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-5.0.0.tgz",
+      "integrity": "sha512-VlZwKPCkYKxQgeSbH5EyngOmRp7Ww7I9rQLERETtf5ofd9pGeswWiOtogpEO850jziPRarreGxn5QIiTqpb2wA==",
       "dev": true
     },
     "webpack": {
@@ -16892,14 +17033,14 @@
       "dev": true
     },
     "whatwg-url": {
-      "version": "6.5.0",
-      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-6.5.0.tgz",
-      "integrity": "sha512-rhRZRqx/TLJQWUpQ6bmrt2UV4f0HCQ463yQuONJqC6fO2VoEb1pTYddbe59SkYq87aoM5A3bdhMZiUiVws+fzQ==",
+      "version": "8.0.0",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-8.0.0.tgz",
+      "integrity": "sha512-41ou2Dugpij8/LPO5Pq64K5q++MnRCBpEHvQr26/mArEKTkCV5aoXIqyhuYtE0pkqScXwhf2JP57rkRTYM29lQ==",
       "dev": true,
       "requires": {
         "lodash.sortby": "^4.7.0",
-        "tr46": "^1.0.1",
-        "webidl-conversions": "^4.0.2"
+        "tr46": "^2.0.0",
+        "webidl-conversions": "^5.0.0"
       }
     },
     "when": {
@@ -17018,24 +17159,22 @@
       }
     },
     "write-file-atomic": {
-      "version": "2.4.1",
-      "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-2.4.1.tgz",
-      "integrity": "sha512-TGHFeZEZMnv+gBFRfjAcxL5bPHrsGKtnb4qsFAws7/vlh+QfwAaySIw4AXP9ZskTTh5GWu3FLuJhsWVdiJPGvg==",
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-3.0.3.tgz",
+      "integrity": "sha512-AvHcyZ5JnSfq3ioSyjrBkH9yW4m7Ayk8/9My/DD9onKeu/94fwrMocemO2QAJFAlnnDN+ZDS+ZjAR5ua1/PV/Q==",
       "dev": true,
       "requires": {
-        "graceful-fs": "^4.1.11",
         "imurmurhash": "^0.1.4",
-        "signal-exit": "^3.0.2"
+        "is-typedarray": "^1.0.0",
+        "signal-exit": "^3.0.2",
+        "typedarray-to-buffer": "^3.1.5"
       }
     },
     "ws": {
-      "version": "5.2.2",
-      "resolved": "https://registry.npmjs.org/ws/-/ws-5.2.2.tgz",
-      "integrity": "sha512-jaHFD6PFv6UgoIVda6qZllptQsMlDEJkTQcybzzXDYM1XO9Y8em691FGMPmM46WGyLU4z9KMgQN+qrux/nhlHA==",
-      "dev": true,
-      "requires": {
-        "async-limiter": "~1.0.0"
-      }
+      "version": "7.2.3",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-7.2.3.tgz",
+      "integrity": "sha512-HTDl9G9hbkNDk98naoR/cHDws7+EyYMOdL1BmjsZXRUjf7d+MficC4B7HLUPlSiho0vg+CWKrGIt/VJBd1xunQ==",
+      "dev": true
     },
     "xml-name-validator": {
       "version": "3.0.0",
@@ -17095,6 +17234,17 @@
         "decamelize": "^1.2.0"
       }
     },
+    "yargs-unparser": {
+      "version": "1.6.0",
+      "resolved": "https://registry.npm.taobao.org/yargs-unparser/download/yargs-unparser-1.6.0.tgz",
+      "integrity": "sha1-7yXCx2n/a9CeSw+dfGBfsnhG6p8=",
+      "dev": true,
+      "requires": {
+        "flat": "^4.1.0",
+        "lodash": "^4.17.15",
+        "yargs": "^13.3.0"
+      }
+    },
     "yorkie": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/yorkie/-/yorkie-2.0.0.tgz",
diff --git a/package.json b/package.json
index b2a2423..6ecc41c 100644
--- a/package.json
+++ b/package.json
@@ -6,10 +6,10 @@
   "scripts": {
     "serve": "vue-cli-service serve",
     "build": "vue-cli-service build",
-    "test:unit": "vue-cli-service test:unit",
+    "test:unit": "vue-cli-service test:unit --require tests/setup.js",
     "lint": "vue-cli-service lint",
-    "docs:serve": "vuepress dev docs",
     "docs:build": "vuepress build docs",
+    "docs:serve": "vuepress dev docs",
     "i18n:report": "vue-cli-service i18n:report --src './src/**/*.?(js|vue)' --locales './src/locales/**/*.json'"
   },
   "dependencies": {
@@ -20,6 +20,8 @@
     "core-js": "3.3.2",
     "js-cookie": "^2.2.1",
     "lodash": "4.17.15",
+    "sinon": "9.0.1",
+    "sinon-chai": "3.5.0",
     "vue": "2.6.11",
     "vue-i18n": "8.15.3",
     "vue-router": "3.1.3",
@@ -31,16 +33,20 @@
     "@vue/cli-plugin-babel": "4.0.0",
     "@vue/cli-plugin-eslint": "4.0.5",
     "@vue/cli-plugin-router": "4.0.0",
-    "@vue/cli-plugin-unit-jest": "4.0.0",
+    "@vue/cli-plugin-unit-mocha": "4.2.3",
     "@vue/cli-plugin-vuex": "4.0.0",
     "@vue/cli-service": "4.0.0",
     "@vue/eslint-config-prettier": "5.0.0",
-    "@vue/test-utils": "1.0.0-beta.29",
+    "@vue/test-utils": "1.0.0-beta.31",
     "babel-eslint": "10.0.3",
+    "chai": "4.1.2",
     "compression-webpack-plugin": "3.0.1",
     "eslint": "5.16.0",
     "eslint-plugin-prettier": "3.1.1",
     "eslint-plugin-vue": "5.0.0",
+    "expect": "25.1.0",
+    "jsdom": "16.2.1",
+    "jsdom-global": "3.0.2",
     "lint-staged": "9.4.2",
     "node-sass": "4.13.1",
     "prettier": "1.18.2",
diff --git a/src/i18n.js b/src/i18n.js
index 745d050..b06f48a 100644
--- a/src/i18n.js
+++ b/src/i18n.js
@@ -22,7 +22,7 @@
 
 export default new VueI18n({
   // Get default locale from local storage
-  locale: localStorage.getItem('storedLanguage'),
+  locale: window.localStorage.getItem('storedLanguage'),
   // Locales that don't exist will fallback to English
   fallbackLocale: 'en-US',
   // Falling back to fallbackLocale generates two console warnings
diff --git a/tests/setup.js b/tests/setup.js
new file mode 100644
index 0000000..e3c220a
--- /dev/null
+++ b/tests/setup.js
@@ -0,0 +1,11 @@
+var chai = require('chai');
+var sinonChai = require('sinon-chai');
+
+chai.use(sinonChai);
+
+require('jsdom-global')('', {
+  url: 'http://localhost'
+});
+
+global.expect = require('chai').expect;
+global.sinon = require('sinon');
diff --git a/tests/unit/example.spec.js b/tests/unit/example.spec.js
deleted file mode 100644
index cb7abba..0000000
--- a/tests/unit/example.spec.js
+++ /dev/null
@@ -1,12 +0,0 @@
-import { shallowMount } from '@vue/test-utils';
-import HelloWorld from '@/components/HelloWorld.vue';
-
-describe('HelloWorld.vue', () => {
-  it('renders props.msg when passed', () => {
-    const msg = 'new message';
-    const wrapper = shallowMount(HelloWorld, {
-      propsData: { msg }
-    });
-    expect(wrapper.text()).toMatch(msg);
-  });
-});