diff --git a/.eslintrc.json b/.eslintrc.json
index 2afad32..5027d33 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -1,4 +1,7 @@
 {
+  "env": {
+    "es6": true
+  },
   "rules": {
     "indent": [2, 2, {"SwitchCase": 1, "VariableDeclarator": 2}],
     "curly": [2, "all"],
diff --git a/.github/workflows/browserstack.yml b/.github/workflows/browserstack.yml
new file mode 100644
index 0000000..63c6ad7
--- /dev/null
+++ b/.github/workflows/browserstack.yml
@@ -0,0 +1,48 @@
+name: 'BrowserStack Test'
+on:
+  push:
+    branches: [ master, develop ]
+  pull_request:
+    branches: [ master, develop ]
+jobs:
+  ubuntu-job:
+    name: 'BrowserStack Test on Ubuntu'
+    runs-on: ubuntu-latest
+    steps:
+
+      - name: 'BrowserStack Env Setup'  # Invokes the setup-env action
+        uses: browserstack/github-actions/setup-env@master
+        with:
+          username:  ${{ secrets.BROWSERSTACK_USERNAME }}
+          access-key: ${{ secrets.BROWSERSTACK_ACCESSKEY }}
+
+      - name: 'BrowserStack Local Tunnel Setup'  # Invokes the setup-local action
+        uses: browserstack/github-actions/setup-local@master
+        with:
+          local-testing: start
+          local-identifier: random
+
+      # The next 3 steps are for building the web application to be tested and starting the web server on the runner environment
+
+      - name: 'Checkout the repository'
+        uses: actions/checkout@v2
+
+      - name: '🚚 Upgrade NPM'
+        run: npm install -g npm
+
+      - name: 'Use Node.js 17.x'
+        uses: actions/setup-node@v2
+        with:
+          node-version: 17.x
+          cache: 'npm'
+
+      - name: 'Concatenate src files for testing'
+        run: grunt concat:test
+
+      - name: 'Running test on BrowserStack with Karma'
+        run: karma start karma.browserstack.js
+
+      - name: 'BrowserStackLocal Stop'  # Terminating the BrowserStackLocal tunnel connection
+        uses: browserstack/github-actions/setup-local@master
+        with:
+          local-testing: stop
diff --git a/.gitignore b/.gitignore
index 56ba81a..e7f01d3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,4 @@
 node_modules
 npm-debug.log
 /*.test.*
+*.log
diff --git a/.jshintignore b/.jshintignore
index 54c5705..a003b6b 100644
--- a/.jshintignore
+++ b/.jshintignore
@@ -3,3 +3,4 @@ dist/**/*.js
 build/**/*.js
 src/options.js
 bin/*
+/karma.browserstack.js
diff --git a/.jshintrc b/.jshintrc
index 3557d07..83563e0 100644
--- a/.jshintrc
+++ b/.jshintrc
@@ -19,7 +19,6 @@
   "smarttabs": true,
   "onevar": true,
   "globals": {
-    "angular": true,
     "module": true,
     "define": true,
     "window": true,
diff --git a/Gruntfile.js b/Gruntfile.js
index 5d0cc45..1cc7853 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -8,6 +8,16 @@ module.exports = function (grunt) {
     require('quiet-grunt');
   }
 
+  /**
+   * Load common tasks for legacy and normal tests
+   */
+  grunt.loadNpmTasks('grunt-contrib-clean');
+  grunt.loadNpmTasks('grunt-contrib-concat');
+  grunt.loadNpmTasks('grunt-contrib-uglify');
+  grunt.loadNpmTasks('grunt-mocha-test');
+  grunt.loadNpmTasks('grunt-endline');
+  grunt.loadNpmTasks('grunt-contrib-jshint');
+
   // Project configuration.
   var config = {
     pkg: grunt.file.readJSON('package.json'),
@@ -124,40 +134,40 @@ module.exports = function (grunt) {
       }
     },
 
-    simplemocha: {
+    mochaTest: {
       functional: {
         src: 'test/functional/**/*.js',
         options: {
-          globals: ['should'],
           timeout: 3000,
           ignoreLeaks: true,
-          reporter: 'spec'
+          reporter: 'spec',
+          require: ['test/bootstrap.js']
         }
       },
       unit: {
         src: 'test/unit/**/*.js',
         options: {
-          globals: ['should'],
           timeout: 3000,
           ignoreLeaks: true,
-          reporter: 'spec'
+          reporter: 'spec',
+          require: ['test/bootstrap.js']
         }
       },
       single: {
         options: {
-          globals: ['should'],
           timeout: 3000,
           ignoreLeaks: false,
-          reporter: 'spec'
+          reporter: 'spec',
+          require: ['test/bootstrap.js']
         }
       },
       cli: {
         src: 'test/unit/cli.js',
         options: {
-          globals: ['should'],
           timeout: 3000,
           ignoreLeaks: false,
-          reporter: 'spec'
+          reporter: 'spec',
+          require: ['test/bootstrap.js']
         }
       }
     }
@@ -165,16 +175,6 @@ module.exports = function (grunt) {
 
   grunt.initConfig(config);
 
-  /**
-   * Load common tasks for legacy and normal tests
-   */
-  grunt.loadNpmTasks('grunt-contrib-clean');
-  grunt.loadNpmTasks('grunt-contrib-concat');
-  grunt.loadNpmTasks('grunt-contrib-uglify');
-  grunt.loadNpmTasks('grunt-simple-mocha');
-  grunt.loadNpmTasks('grunt-endline');
-  grunt.loadNpmTasks('grunt-contrib-jshint');
-
   /**
    * Generate Changelog
    */
@@ -210,23 +210,23 @@ module.exports = function (grunt) {
   grunt.registerTask('single-test', function (file) {
     'use strict';
     grunt.config.merge({
-      simplemocha: {
+      mochaTest: {
         single: {
           src: file
         }
       }
     });
 
-    grunt.task.run(['lint', 'concat:test', 'simplemocha:single', 'clean']);
+    grunt.task.run(['lint', 'concat:test', 'mochaTest:single', 'clean']);
   });
 
   /**
    * Tasks
    */
-  grunt.registerTask('test', ['clean', 'lint', 'concat:test', 'simplemocha:unit', 'simplemocha:functional', 'clean']);
-  grunt.registerTask('test-functional', ['concat:test', 'simplemocha:functional', 'clean']);
-  grunt.registerTask('test-unit', ['concat:test', 'simplemocha:unit', 'clean']);
-  grunt.registerTask('test-cli', ['clean', 'lint', 'concat:test', 'simplemocha:cli', 'clean']);
+  grunt.registerTask('test', ['clean', 'lint', 'concat:test', 'mochaTest:unit', 'mochaTest:functional', 'clean']);
+  grunt.registerTask('test-functional', ['concat:test', 'mochaTest:functional', 'clean']);
+  grunt.registerTask('test-unit', ['concat:test', 'mochaTest:unit', 'clean']);
+  grunt.registerTask('test-cli', ['clean', 'lint', 'concat:test', 'mochaTest:cli', 'clean']);
 
   grunt.registerTask('performance', ['concat:test', 'performancejs', 'clean']);
   grunt.registerTask('build', ['test', 'concat:dist', 'concat:cli', 'uglify:dist', 'uglify:cli', 'endline']);
diff --git a/TASKS.TODO.md b/TASKS.TODO.md
index c9395f1..c353049 100644
--- a/TASKS.TODO.md
+++ b/TASKS.TODO.md
@@ -101,12 +101,12 @@
 ## CLI
 - [ ] Refactor the CLI
 - [ ] **#381**: *Support for src and dst directories in showdown cli*
-- [ ] **#584**: *Fails to read from stdin*
-- [ ] **#554**: *CLI not working with jsdom v10*
+- [X] **#584**: *Fails to read from stdin*
+- [X] **#554**: *CLI not working with jsdom v10*
 
 ## Other stuff
 - [X] Regexp rewrite for more performance oompf
-- [ ] Full unit testing
+- [X] Full unit testing
 - [ ] Better error reporting
 
 ## Stuff that probably won't make it to v2.0
@@ -138,3 +138,9 @@ This should address:
 - [ ] Options
 - [ ] Extensions (and the new event system)
 - [ ] Cookbook (with stuff for backwards compatibility, specially regarding removed options)
+
+## Browser Testing
+
+- [X] Implement unit tests in Karma
+- [ ] Implement functional tests in Karma
+- [ ] Integrate with browserstack
diff --git a/karma.browserstack.js b/karma.browserstack.js
new file mode 100644
index 0000000..42a9070
--- /dev/null
+++ b/karma.browserstack.js
@@ -0,0 +1,64 @@
+module.exports = function (config) {
+  config.set({
+    // global config of your BrowserStack account
+    browserStack: {
+      username: process.env.BROWSERSTACK_USERNAME,
+      accessKey: process.env.BROWSERSTACK_ACCESSKEY
+    },
+
+    // define browsers
+    customLaunchers: {
+      bstack_chrome_windows: {
+        base: 'BrowserStack',
+        browser: 'chrome',
+        browser_version: '72.0',
+        os: 'Windows',
+        os_version: '10'
+      },
+      bstack_firefox_windows: {
+        base: 'BrowserStack',
+        browser: 'firefox',
+        browser_version: '98.0',
+        os: 'Windows',
+        os_version: '10'
+      },
+      //dropped support for IE 10
+      bstack_ie10_windows: {
+        base: 'BrowserStack',
+        browser: 'ie',
+        browser_version: '10',
+        os: 'Windows',
+        os_version: '7'
+      },
+      //dropped support for IE 10
+      bstack_ie11_windows: {
+        base: 'BrowserStack',
+        browser: 'ie',
+        browser_version: '11',
+        os: 'Windows',
+        os_version: '10'
+      },
+      bstack_iphoneX: {
+        base: 'BrowserStack',
+        browser: 'safari',
+        device: 'iPhone X',
+        os: 'ios',
+        real_mobile: true,
+        os_version: '11.0'
+      }
+    },
+
+    browsers: ['bstack_chrome_windows', 'bstack_firefox_windows', 'bstack_ie11_windows', 'bstack_iphoneX'],
+    frameworks: ['mocha', 'chai'],
+    reporters: ['dots', 'BrowserStack'],
+    files: [
+      { pattern: '.build/showdown.js'},
+      { pattern: 'src/options.js'},
+      // tests
+      { pattern: 'test/unit/showdown*.js' },
+      { pattern: 'test/functional/showdown*.js' },
+    ],
+    singleRun: true,
+    concurrency: Infinity
+  });
+};
diff --git a/karma.conf.js b/karma.conf.js
new file mode 100644
index 0000000..ade836f
--- /dev/null
+++ b/karma.conf.js
@@ -0,0 +1,36 @@
+module.exports = function (config) {
+  config.set({
+    client: {
+      captureConsole: true
+    },
+    browserConsoleLogOptions: {
+      level: 'log',
+      format: '%b %T: %m',
+      terminal: true
+    },
+    logLevel: config.LOG_LOG,
+    frameworks: ['mocha', 'chai'],
+    files: [
+      { pattern: '.build/showdown.js'},
+      { pattern: 'src/options.js'},
+      // tests
+      { pattern: 'test/unit/showdown*.js' },
+      { pattern: 'test/functional/showdown*.js' },
+    ],
+    reporters: ['progress'],
+    port: 9876,  // karma web server port
+    colors: true,
+    browsers: ['ChromeHeadless', 'FirefoxHeadless', 'jsdom'],
+    autoWatch: false,
+    singleRun: true, // Karma captures browsers, runs the tests and exits
+    //concurrency: Infinity,
+    customLaunchers: {
+      'FirefoxHeadless': {
+        base: 'Firefox',
+        flags: [
+          '-headless',
+        ]
+      }
+    },
+  });
+};
diff --git a/package-lock.json b/package-lock.json
index 56fa9b0..473b1b6 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -3,36 +3,6 @@
   "version": "2.0.0",
   "lockfileVersion": 2,
   "requires": true,
-  "author": "Estevão Santos",
-  "contributors": [
-    "John Gruber",
-    "John Fraser",
-    "Corey Innis",
-    "Remy Sharp",
-    "Konstantin Käfer",
-    "Roger Braun",
-    "Dominic Tarr",
-    "Cat Chen",
-    "Titus Stone",
-    "Rob Sutherland",
-    "Pavel Lang",
-    "Ben Combee",
-    "Adam Backstrom",
-    "Pascal Deschênes",
-    "Estevão Santos"
-  ],
-  "description": "A Markdown to HTML converter written in Javascript",
-  "files": [
-    "bin",
-    "dist"
-  ],
-  "homepage": "http://showdownjs.com/",
-  "keywords": [
-    "markdown",
-    "converter"
-  ],
-  "license": "MIT",
-  "main": "./dist/showdown.js",
   "packages": {
     "": {
       "name": "showdown",
@@ -57,7 +27,15 @@
         "grunt-conventional-github-releaser": "^1.0.0",
         "grunt-endline": "^0.7.0",
         "grunt-eslint": "^24.0.0",
+        "grunt-mocha-test": "^0.13.3",
         "grunt-simple-mocha": "^0.4.0",
+        "karma": "^6.3.17",
+        "karma-browserstack-launcher": "^1.6.0",
+        "karma-chai": "^0.1.0",
+        "karma-chrome-launcher": "^3.1.1",
+        "karma-firefox-launcher": "^2.1.2",
+        "karma-jsdom-launcher": "^12.0.0",
+        "karma-mocha": "^2.0.1",
         "load-grunt-tasks": "^5.1.0",
         "performance-now": "^2.1.0",
         "quiet-grunt": "^0.2.0",
@@ -70,6 +48,15 @@
         "url": "https://www.paypal.me/tiviesantos"
       }
     },
+    "node_modules/@colors/colors": {
+      "version": "1.5.0",
+      "resolved": "https://registry.npmjs.org/@colors/colors/-/colors-1.5.0.tgz",
+      "integrity": "sha512-ooWCrlZP11i8GImSjTHYHLkvFDP48nS4+204nGb1RiX/WXYHmJA2III9/e2DWVabCESdW7hBAEzHRqUn9OUVvQ==",
+      "dev": true,
+      "engines": {
+        "node": ">=0.1.90"
+      }
+    },
     "node_modules/@eslint/eslintrc": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/@eslint/eslintrc/-/eslintrc-1.2.1.tgz",
@@ -163,6 +150,15 @@
       "integrity": "sha512-+iTbntw2IZPb/anVDbypzfQa+ay64MW0Zo8aJ8gZPWMMK6/OubMVb6lUPMagqjOPnmtauXnFCACVl3O7ogjeqQ==",
       "dev": true
     },
+    "node_modules/@socket.io/base64-arraybuffer": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/@socket.io/base64-arraybuffer/-/base64-arraybuffer-1.0.2.tgz",
+      "integrity": "sha512-dOlCBKnDw4iShaIsH/bxujKTM18+2TOAsYz+KSc11Am38H4q5Xw8Bbz97ZYdrVNM+um3p7w86Bvvmcn9q+5+eQ==",
+      "dev": true,
+      "engines": {
+        "node": ">= 0.6.0"
+      }
+    },
     "node_modules/@tootallnate/once": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/@tootallnate/once/-/once-2.0.0.tgz",
@@ -171,12 +167,36 @@
         "node": ">= 10"
       }
     },
+    "node_modules/@types/component-emitter": {
+      "version": "1.2.11",
+      "resolved": "https://registry.npmjs.org/@types/component-emitter/-/component-emitter-1.2.11.tgz",
+      "integrity": "sha512-SRXjM+tfsSlA9VuG8hGO2nft2p8zjXCK1VcC6N4NXbBbYbSia9kzCChYQajIjzIqOOOuh5Ock6MmV2oux4jDZQ==",
+      "dev": true
+    },
+    "node_modules/@types/cookie": {
+      "version": "0.4.1",
+      "resolved": "https://registry.npmjs.org/@types/cookie/-/cookie-0.4.1.tgz",
+      "integrity": "sha512-XW/Aa8APYr6jSVVA1y/DEIZX0/GMKLEVekNG727R8cs56ahETkRAy/3DR7+fJyh7oUgGwNQaRfXCun0+KbWY7Q==",
+      "dev": true
+    },
+    "node_modules/@types/cors": {
+      "version": "2.8.12",
+      "resolved": "https://registry.npmjs.org/@types/cors/-/cors-2.8.12.tgz",
+      "integrity": "sha512-vt+kDhq/M2ayberEtJcIN/hxXy1Pk+59g2FV/ZQceeaTyCtCucjL2Q7FXlFjtWn4n15KCr1NE2lNNFhp0lEThw==",
+      "dev": true
+    },
     "node_modules/@types/minimatch": {
       "version": "3.0.5",
       "resolved": "https://registry.npmjs.org/@types/minimatch/-/minimatch-3.0.5.tgz",
       "integrity": "sha512-Klz949h02Gz2uZCMGwDUSDS1YBlTdDDgbWHi+81l29tQALUtvz4rAYi5uoVhE5Lagoq6DeqAUlbrHvW/mXDgdQ==",
       "dev": true
     },
+    "node_modules/@types/node": {
+      "version": "17.0.23",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-17.0.23.tgz",
+      "integrity": "sha512-UxDxWn7dl97rKVeVS61vErvw086aCYhDLyvRQZ5Rk65rZKepaFdm53GeqXaKBuOhED4e9uWq34IC3TdSdJJ2Gw==",
+      "dev": true
+    },
     "node_modules/@ungap/promise-all-settled": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/@ungap/promise-all-settled/-/promise-all-settled-1.1.2.tgz",
@@ -194,6 +214,19 @@
       "integrity": "sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q==",
       "dev": true
     },
+    "node_modules/accepts": {
+      "version": "1.3.8",
+      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.8.tgz",
+      "integrity": "sha512-PYAthTa2m2VKxuvSD3DPC/Gy+U+sOA1LAuT8mkmRuvw+NACSaeXEQ+NHcVF7rONl6qcaxV3Uuemwawk+7+SJLw==",
+      "dev": true,
+      "dependencies": {
+        "mime-types": "~2.1.34",
+        "negotiator": "0.6.3"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
     "node_modules/acorn": {
       "version": "8.7.0",
       "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.7.0.tgz",
@@ -413,6 +446,15 @@
       "integrity": "sha512-3oSeUO0TMV67hN1AmbXsK4yaqU7tjiHlbxRDZOpH0KW9+CeX4bRAaX0Anxt0tx2MrpRpWwQaPwIlISEJhYU5Pw==",
       "dev": true
     },
+    "node_modules/base64id": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/base64id/-/base64id-2.0.0.tgz",
+      "integrity": "sha512-lGe34o6EHj9y3Kts9R4ZYs/Gr+6N7MCaMlIFA3F1R2O5/m7K06AxfSeO5530PEERE6/WyEg3lsuyw4GHlPZHog==",
+      "dev": true,
+      "engines": {
+        "node": "^4.5.0 || >= 5.9"
+      }
+    },
     "node_modules/binary-extensions": {
       "version": "2.2.0",
       "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-2.2.0.tgz",
@@ -422,6 +464,42 @@
         "node": ">=8"
       }
     },
+    "node_modules/body-parser": {
+      "version": "1.19.2",
+      "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.19.2.tgz",
+      "integrity": "sha512-SAAwOxgoCKMGs9uUAUFHygfLAyaniaoun6I8mFY9pRAJL9+Kec34aU+oIjDhTycub1jozEfEwx1W1IuOYxVSFw==",
+      "dev": true,
+      "dependencies": {
+        "bytes": "3.1.2",
+        "content-type": "~1.0.4",
+        "debug": "2.6.9",
+        "depd": "~1.1.2",
+        "http-errors": "1.8.1",
+        "iconv-lite": "0.4.24",
+        "on-finished": "~2.3.0",
+        "qs": "6.9.7",
+        "raw-body": "2.4.3",
+        "type-is": "~1.6.18"
+      },
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/body-parser/node_modules/debug": {
+      "version": "2.6.9",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
+      "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+      "dev": true,
+      "dependencies": {
+        "ms": "2.0.0"
+      }
+    },
+    "node_modules/body-parser/node_modules/ms": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
+      "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g=",
+      "dev": true
+    },
     "node_modules/brace-expansion": {
       "version": "1.1.11",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
@@ -455,12 +533,98 @@
       "integrity": "sha512-qhAVI1+Av2X7qelOfAIYwXONood6XlZE/fXaBSmW/T5SzLAmCgzi+eiWE7fUvbHaeNBQH13UftjpXxsfLkMpgw==",
       "dev": true
     },
+    "node_modules/browserstack": {
+      "version": "1.5.3",
+      "resolved": "https://registry.npmjs.org/browserstack/-/browserstack-1.5.3.tgz",
+      "integrity": "sha512-AO+mECXsW4QcqC9bxwM29O7qWa7bJT94uBFzeb5brylIQwawuEziwq20dPYbins95GlWzOawgyDNdjYAo32EKg==",
+      "dev": true,
+      "dependencies": {
+        "https-proxy-agent": "^2.2.1"
+      }
+    },
+    "node_modules/browserstack-local": {
+      "version": "1.4.9",
+      "resolved": "https://registry.npmjs.org/browserstack-local/-/browserstack-local-1.4.9.tgz",
+      "integrity": "sha512-V+q8HQwRQFr9nd32xR66ZZ3VDWa3Kct4IMMudhKgcuD7cWrvvFARZOibx71II+Rf7P5nMQpWWxl9z/3p927nbg==",
+      "dev": true,
+      "dependencies": {
+        "https-proxy-agent": "^4.0.0",
+        "is-running": "^2.1.0",
+        "ps-tree": "=1.2.0",
+        "temp-fs": "^0.9.9"
+      }
+    },
+    "node_modules/browserstack-local/node_modules/agent-base": {
+      "version": "5.1.1",
+      "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-5.1.1.tgz",
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@@ -9135,6 +10882,15 @@
       "integrity": "sha512-3ouUOpQhtgrbOa17J7+uxOTpITYWaGP7/AhoR3+A+/1e9skrzelGi/dXzEYyvbxubEF6Wn2ypscTKiKJFFn1ag==",
       "dev": true
     },
+    "ps-tree": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/ps-tree/-/ps-tree-1.2.0.tgz",
+      "integrity": "sha512-0VnamPPYHl4uaU/nSFeZZpR21QAWRz+sRv4iW9+v/GS/J5U5iZB5BNN6J0RMoOvdx2gWM2+ZFMIm58q24e4UYA==",
+      "dev": true,
+      "requires": {
+        "event-stream": "=3.3.4"
+      }
+    },
     "psl": {
       "version": "1.8.0",
       "resolved": "https://registry.npmjs.org/psl/-/psl-1.8.0.tgz",
@@ -9151,6 +10907,18 @@
       "integrity": "sha1-fjL3W0E4EpHQRhHxvxQQmsAGUdc=",
       "dev": true
     },
+    "qjobs": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/qjobs/-/qjobs-1.2.0.tgz",
+      "integrity": "sha512-8YOJEHtxpySA3fFDyCRxA+UUV+fA+rTWnuWvylOK/NCjhY+b4ocCtmu8TtsWb+mYeU+GCHf/S66KZF/AsteKHg==",
+      "dev": true
+    },
+    "qs": {
+      "version": "6.9.7",
+      "resolved": "https://registry.npmjs.org/qs/-/qs-6.9.7.tgz",
+      "integrity": "sha512-IhMFgUmuNpyRfxA90umL7ByLlgRXu6tIfKPpF5TmcfRLlLCckfP/g3IQmju6jjpu+Hh8rA+2p6A27ZSPOOHdKw==",
+      "dev": true
+    },
     "quick-lru": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/quick-lru/-/quick-lru-1.1.0.tgz",
@@ -9172,6 +10940,24 @@
         "safe-buffer": "^5.1.0"
       }
     },
+    "range-parser": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/range-parser/-/range-parser-1.2.1.tgz",
+      "integrity": "sha512-Hrgsx+orqoygnmhFbKaHE6c296J+HTAQXoxEF6gNupROmmGJRoyzfG3ccAveqCBrwr/2yxQ5BVd/GTl5agOwSg==",
+      "dev": true
+    },
+    "raw-body": {
+      "version": "2.4.3",
+      "resolved": "https://registry.npmjs.org/raw-body/-/raw-body-2.4.3.tgz",
+      "integrity": "sha512-UlTNLIcu0uzb4D2f4WltY6cVjLi+/jEN4lgEUj3E04tpMDpUlkBo/eSn6zou9hum2VMNpCCUone0O0WeJim07g==",
+      "dev": true,
+      "requires": {
+        "bytes": "3.1.2",
+        "http-errors": "1.8.1",
+        "iconv-lite": "0.4.24",
+        "unpipe": "1.0.0"
+      }
+    },
     "read-pkg": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/read-pkg/-/read-pkg-1.1.0.tgz",
@@ -9278,6 +11064,12 @@
       "integrity": "sha1-jGStX9MNqxyXbiNE/+f3kqam30I=",
       "dev": true
     },
+    "requires-port": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/requires-port/-/requires-port-1.0.0.tgz",
+      "integrity": "sha1-kl0mAdOaxIXgkc8NpcbmlNw9yv8=",
+      "dev": true
+    },
     "resolve": {
       "version": "1.22.0",
       "resolved": "https://registry.npmjs.org/resolve/-/resolve-1.22.0.tgz",
@@ -9322,6 +11114,12 @@
         }
       }
     },
+    "rfdc": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/rfdc/-/rfdc-1.3.0.tgz",
+      "integrity": "sha512-V2hovdzFbOi77/WajaSMXk2OLm+xNIeQdMMuB7icj7bk6zi2F8GGAxigcnDFpJHbNyNcgyJDiP+8nOrY5cZGrA==",
+      "dev": true
+    },
     "rimraf": {
       "version": "3.0.2",
       "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-3.0.2.tgz",
@@ -9389,6 +11187,12 @@
         "randombytes": "^2.1.0"
       }
     },
+    "setprototypeof": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/setprototypeof/-/setprototypeof-1.2.0.tgz",
+      "integrity": "sha512-E5LDX7Wrp85Kil5bhZv46j8jOeboKq5JMmYM3gVGdGH8xFpPWXUMsNrlODCrkoxMEeNi/XZIwuRvY4XNwYMJpw==",
+      "dev": true
+    },
     "shebang-command": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/shebang-command/-/shebang-command-2.0.0.tgz",
@@ -9424,6 +11228,37 @@
         "supports-color": "^7.2.0"
       }
     },
+    "socket.io": {
+      "version": "4.4.1",
+      "resolved": "https://registry.npmjs.org/socket.io/-/socket.io-4.4.1.tgz",
+      "integrity": "sha512-s04vrBswdQBUmuWJuuNTmXUVJhP0cVky8bBDhdkf8y0Ptsu7fKU2LuLbts9g+pdmAdyMMn8F/9Mf1/wbtUN0fg==",
+      "dev": true,
+      "requires": {
+        "accepts": "~1.3.4",
+        "base64id": "~2.0.0",
+        "debug": "~4.3.2",
+        "engine.io": "~6.1.0",
+        "socket.io-adapter": "~2.3.3",
+        "socket.io-parser": "~4.0.4"
+      }
+    },
+    "socket.io-adapter": {
+      "version": "2.3.3",
+      "resolved": "https://registry.npmjs.org/socket.io-adapter/-/socket.io-adapter-2.3.3.tgz",
+      "integrity": "sha512-Qd/iwn3VskrpNO60BeRyCyr8ZWw9CPZyitW4AQwmRZ8zCiyDiL+znRnWX6tDHXnWn1sJrM1+b6Mn6wEDJJ4aYQ==",
+      "dev": true
+    },
+    "socket.io-parser": {
+      "version": "4.0.4",
+      "resolved": "https://registry.npmjs.org/socket.io-parser/-/socket.io-parser-4.0.4.tgz",
+      "integrity": "sha512-t+b0SS+IxG7Rxzda2EVvyBZbvFPBCjJoyHuE0P//7OAsN23GItzDRdWa6ALxZI/8R5ygK7jAR6t028/z+7295g==",
+      "dev": true,
+      "requires": {
+        "@types/component-emitter": "^1.2.10",
+        "component-emitter": "~1.3.0",
+        "debug": "~4.3.1"
+      }
+    },
     "source-map": {
       "version": "0.5.7",
       "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
@@ -9504,6 +11339,32 @@
       "integrity": "sha1-BOaSb2YolTVPPdAVIDYzuFcpfiw=",
       "dev": true
     },
+    "statuses": {
+      "version": "1.5.0",
+      "resolved": "https://registry.npmjs.org/statuses/-/statuses-1.5.0.tgz",
+      "integrity": "sha1-Fhx9rBd2Wf2YEfQ3cfqZOBR4Yow=",
+      "dev": true
+    },
+    "stream-combiner": {
+      "version": "0.0.4",
+      "resolved": "https://registry.npmjs.org/stream-combiner/-/stream-combiner-0.0.4.tgz",
+      "integrity": "sha1-TV5DPBhSYd3mI8o/RMWGvPXErRQ=",
+      "dev": true,
+      "requires": {
+        "duplexer": "~0.1.1"
+      }
+    },
+    "streamroller": {
+      "version": "3.0.6",
+      "resolved": "https://registry.npmjs.org/streamroller/-/streamroller-3.0.6.tgz",
+      "integrity": "sha512-Qz32plKq/MZywYyhEatxyYc8vs994Gz0Hu2MSYXXLD233UyPeIeRBZARIIGwFer4Mdb8r3Y2UqKkgyDghM6QCg==",
+      "dev": true,
+      "requires": {
+        "date-format": "^4.0.6",
+        "debug": "^4.3.4",
+        "fs-extra": "^10.0.1"
+      }
+    },
     "string_decoder": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
@@ -9574,6 +11435,26 @@
       "resolved": "https://registry.npmjs.org/symbol-tree/-/symbol-tree-3.2.4.tgz",
       "integrity": "sha512-9QNk5KwDF+Bvz+PyObkmSYjI5ksVUYtjW7AU22r2NKcfLJcXp96hkDWU3+XndOsUb+AQ9QhfzfCT2O+CNWT5Tw=="
     },
+    "temp-fs": {
+      "version": "0.9.9",
+      "resolved": "https://registry.npmjs.org/temp-fs/-/temp-fs-0.9.9.tgz",
+      "integrity": "sha1-gHFzBDeHByDpQxUy/igUNk+IA9c=",
+      "dev": true,
+      "requires": {
+        "rimraf": "~2.5.2"
+      },
+      "dependencies": {
+        "rimraf": {
+          "version": "2.5.4",
+          "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-2.5.4.tgz",
+          "integrity": "sha1-loAAk8vxoMhr2VtGJUZ1NcKd+gQ=",
+          "dev": true,
+          "requires": {
+            "glob": "^7.0.5"
+          }
+        }
+      }
+    },
     "text-extensions": {
       "version": "1.9.0",
       "resolved": "https://registry.npmjs.org/text-extensions/-/text-extensions-1.9.0.tgz",
@@ -9602,6 +11483,15 @@
         "xtend": "~4.0.1"
       }
     },
+    "tmp": {
+      "version": "0.2.1",
+      "resolved": "https://registry.npmjs.org/tmp/-/tmp-0.2.1.tgz",
+      "integrity": "sha512-76SUhtfqR2Ijn+xllcI5P1oyannHNHByD80W1q447gU3mp9G9PSpGdWmjUOHRDPiHYacIk66W7ubDTuPF3BEtQ==",
+      "dev": true,
+      "requires": {
+        "rimraf": "^3.0.0"
+      }
+    },
     "to-regex-range": {
       "version": "5.0.1",
       "resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-5.0.1.tgz",
@@ -9611,6 +11501,12 @@
         "is-number": "^7.0.0"
       }
     },
+    "toidentifier": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/toidentifier/-/toidentifier-1.0.1.tgz",
+      "integrity": "sha512-o5sSPKEkg/DIQNmH43V0/uerLrpzVedkUh8tGNvaeXpfpuwjKenlSox/2O/BTlZUtEe+JG7s5YhEz608PlAHRA==",
+      "dev": true
+    },
     "tough-cookie": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-4.0.0.tgz",
@@ -9619,6 +11515,13 @@
         "psl": "^1.1.33",
         "punycode": "^2.1.1",
         "universalify": "^0.1.2"
+      },
+      "dependencies": {
+        "universalify": {
+          "version": "0.1.2",
+          "resolved": "https://registry.npmjs.org/universalify/-/universalify-0.1.2.tgz",
+          "integrity": "sha512-rBJeI5CXAlmy1pV+617WB9J63U6XcazHHF2f2dbJix4XzpUF0RS3Zbj0FGIOCAva5P/d/GBOYaACQ1w+0azUkg=="
+        }
       }
     },
     "tr46": {
@@ -9662,12 +11565,28 @@
       "integrity": "sha512-Ne+eE4r0/iWnpAxD852z3A+N0Bt5RN//NjJwRd2VFHEmrywxf5vsZlh4R6lixl6B+wz/8d+maTSAkN1FIkI3LQ==",
       "dev": true
     },
+    "type-is": {
+      "version": "1.6.18",
+      "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.18.tgz",
+      "integrity": "sha512-TkRKr9sUTxEH8MdfuCSP7VizJyzRNMjj2J2do2Jr3Kym598JVdEksuzPQCnlFPW4ky9Q+iA+ma9BGm06XQBy8g==",
+      "dev": true,
+      "requires": {
+        "media-typer": "0.3.0",
+        "mime-types": "~2.1.24"
+      }
+    },
     "typedarray": {
       "version": "0.0.6",
       "resolved": "https://registry.npmjs.org/typedarray/-/typedarray-0.0.6.tgz",
       "integrity": "sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=",
       "dev": true
     },
+    "ua-parser-js": {
+      "version": "0.7.31",
+      "resolved": "https://registry.npmjs.org/ua-parser-js/-/ua-parser-js-0.7.31.tgz",
+      "integrity": "sha512-qLK/Xe9E2uzmYI3qLeOmI0tEOt+TBBQyUIAh4aAgU05FVYzeZrKUdkAZfBNVGRaHVgV0TDkdEngJSw/SyQchkQ==",
+      "dev": true
+    },
     "uglify-js": {
       "version": "3.15.3",
       "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.15.3.tgz",
@@ -9699,9 +11618,16 @@
       }
     },
     "universalify": {
-      "version": "0.1.2",
-      "resolved": "https://registry.npmjs.org/universalify/-/universalify-0.1.2.tgz",
-      "integrity": "sha512-rBJeI5CXAlmy1pV+617WB9J63U6XcazHHF2f2dbJix4XzpUF0RS3Zbj0FGIOCAva5P/d/GBOYaACQ1w+0azUkg=="
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/universalify/-/universalify-2.0.0.tgz",
+      "integrity": "sha512-hAZsKq7Yy11Zu1DE0OzWjw7nnLZmJZYTDZZyEFHZdUhV8FkH5MCfoU1XMaxXovpyW5nq5scPqq0ZDP9Zyl04oQ==",
+      "dev": true
+    },
+    "unpipe": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
+      "integrity": "sha1-sr9O6FFKrmFltIF4KdIbLvSZBOw=",
+      "dev": true
     },
     "uri-js": {
       "version": "4.4.1",
@@ -9724,6 +11650,12 @@
       "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
       "dev": true
     },
+    "utils-merge": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
+      "integrity": "sha1-n5VxD1CiZ5R7LMwSR0HBAoQn5xM=",
+      "dev": true
+    },
     "v8-compile-cache": {
       "version": "2.3.0",
       "resolved": "https://registry.npmjs.org/v8-compile-cache/-/v8-compile-cache-2.3.0.tgz",
@@ -9749,6 +11681,18 @@
         "spdx-expression-parse": "^3.0.0"
       }
     },
+    "vary": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
+      "integrity": "sha1-IpnwLG3tMNSllhsLn3RSShj2NPw=",
+      "dev": true
+    },
+    "void-elements": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/void-elements/-/void-elements-2.0.1.tgz",
+      "integrity": "sha1-wGavtYK7HLQSjWDqkjkulNXp2+w=",
+      "dev": true
+    },
     "w3c-hr-time": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/w3c-hr-time/-/w3c-hr-time-1.0.2.tgz",
@@ -9932,40 +11876,5 @@
       "integrity": "sha512-rVksvsnNCdJ/ohGc6xgPwyN8eheCxsiLM8mxuE/t/mOVqJewPuO1miLpTHQiRgTKCLexL4MeAFVagts7HmNZ2Q==",
       "dev": true
     }
-  },
-  "bin": {
-    "showdown": "bin/showdown.js"
-  },
-  "devDependencies": {
-    "chai": "*",
-    "chai-match": "*",
-    "grunt": "^1.4.1",
-    "grunt-contrib-clean": "^2.0.0",
-    "grunt-contrib-concat": "^2.0.0",
-    "grunt-contrib-jshint": "^3.1.0",
-    "grunt-contrib-uglify": "^5.0.1",
-    "grunt-conventional-changelog": "^6.1.0",
-    "grunt-conventional-github-releaser": "^1.0.0",
-    "grunt-endline": "^0.7.0",
-    "grunt-eslint": "^24.0.0",
-    "grunt-simple-mocha": "^0.4.0",
-    "load-grunt-tasks": "^5.1.0",
-    "performance-now": "^2.1.0",
-    "quiet-grunt": "^0.2.0",
-    "semver-sort": "^1.0.0",
-    "sinon": "*",
-    "source-map-support": "^0.5.21"
-  },
-  "funding": {
-    "type": "individual",
-    "url": "https://www.paypal.me/tiviesantos"
-  },
-  "repository": {
-    "type": "git",
-    "url": "https://github.com/showdownjs/showdown.git",
-    "web": "https://github.com/showdownjs/showdown"
-  },
-  "scripts": {
-    "test": "grunt test"
   }
 }
diff --git a/package.json b/package.json
index 745c039..e8cf39b 100644
--- a/package.json
+++ b/package.json
@@ -58,16 +58,27 @@
     "grunt-conventional-github-releaser": "^1.0.0",
     "grunt-endline": "^0.7.0",
     "grunt-eslint": "^24.0.0",
+    "grunt-mocha-test": "^0.13.3",
     "grunt-simple-mocha": "^0.4.0",
+    "karma": "^6.3.17",
+    "karma-browserstack-launcher": "^1.6.0",
+    "karma-chai": "^0.1.0",
+    "karma-chrome-launcher": "^3.1.1",
+    "karma-firefox-launcher": "^2.1.2",
+    "karma-jsdom-launcher": "^12.0.0",
+    "karma-mocha": "^2.0.1",
     "load-grunt-tasks": "^5.1.0",
     "performance-now": "^2.1.0",
     "quiet-grunt": "^0.2.0",
+    "semver-sort": "^1.0.0",
     "sinon": "*",
-    "source-map-support": "^0.5.21",
-    "semver-sort": "^1.0.0"
+    "source-map-support": "^0.5.21"
   },
   "dependencies": {
     "commander": "^9.0.0",
     "jsdom": "^19.0.0"
+  },
+  "overrides": {
+    "minimist": "^1.2.6"
   }
 }
diff --git a/test/bootstrap.js b/test/bootstrap.js
new file mode 100644
index 0000000..5c2ec14
--- /dev/null
+++ b/test/bootstrap.js
@@ -0,0 +1,6 @@
+//.webstorm.bootstrap.js
+var chai = require('chai');
+global.chai = chai;
+global.expect = chai.expect;
+global.showdown = require('../.build/showdown.js');
+global.getDefaultOpts = require('./optionswp.js').getDefaultOpts;
diff --git a/test/functional/makehtml/makehtml.bootstrap.js b/test/functional/makehtml/makehtml.bootstrap.js
index a4a092d..9ef7672 100644
--- a/test/functional/makehtml/makehtml.bootstrap.js
+++ b/test/functional/makehtml/makehtml.bootstrap.js
@@ -8,7 +8,7 @@
 
   require('source-map-support').install();
   require('chai').should();
-  var fs = require('fs');
+  let fs = require('fs');
 
   function getTestSuite (dir) {
     return fs.readdirSync(dir)
@@ -17,20 +17,20 @@
   }
 
   function getJsonTestSuite (file) {
-    var json = JSON.parse(fs.readFileSync(file, 'utf8'));
+    let json = JSON.parse(fs.readFileSync(file, 'utf8'));
     return mapJson(json, file);
   }
 
   function filter () {
     return function (file) {
-      var ext = file.slice(-3);
+      let ext = file.slice(-3);
       return (ext === '.md');
     };
   }
 
   function map (dir) {
     return function (file) {
-      var oFile = 'file://' + process.cwd().replace(/\\/g, '/') + dir + file,
+      let oFile = 'file://' + process.cwd().replace(/\\/g, '/') + dir + file,
           name = file.replace('.md', ''),
           htmlPath = dir + name + '.html',
           html = fs.readFileSync(htmlPath, 'utf8'),
@@ -47,12 +47,12 @@
   }
 
   function mapJson (jsonArray, file) {
-    var tcObj = {};
-    for (var i = 0; i < jsonArray.length; ++i) {
-      var section = jsonArray[i].section;
-      var name = jsonArray[i].section + '_' + jsonArray[i].example;
-      var md = jsonArray[i].markdown;
-      var html = jsonArray[i].html;
+    let tcObj = {};
+    for (let i = 0; i < jsonArray.length; ++i) {
+      let section = jsonArray[i].section;
+      let name = jsonArray[i].section + '_' + jsonArray[i].example;
+      let md = jsonArray[i].markdown;
+      let html = jsonArray[i].html;
       if (!tcObj.hasOwnProperty(section)) {
         tcObj[section] = [];
       }
diff --git a/test/unit/optionswp.js b/test/optionswp.js
similarity index 100%
rename from test/unit/optionswp.js
rename to test/optionswp.js
diff --git a/test/unit/showdown.Converter.js b/test/unit/showdown.Converter.js
index 0b8c7e0..7ff6b8d 100644
--- a/test/unit/showdown.Converter.js
+++ b/test/unit/showdown.Converter.js
@@ -1,16 +1,15 @@
 /**
  * Created by Estevao on 31-05-2015.
  */
-require('source-map-support').install();
-require('chai').should();
-require('sinon');
-var showdown = require('../../.build/showdown.js');
+//let showdown = require('../../.build/showdown.js') || require('showdown');
+chai.should();
+
 
 describe('showdown.Converter', function () {
   'use strict';
 
   describe('option methods', function () {
-    var converter = new showdown.Converter();
+    let converter = new showdown.Converter();
 
     it('setOption() should set option foo=baz', function () {
       converter.setOption('foo', 'baz');
@@ -21,14 +20,14 @@ describe('showdown.Converter', function () {
     });
 
     it('getOptions() should contain foo=baz', function () {
-      var options = converter.getOptions();
+      let options = converter.getOptions();
       options.should.have.ownProperty('foo');
       options.foo.should.equal('baz');
     });
   });
 
   describe('metadata methods', function () {
-    var converter = new showdown.Converter();
+    let converter = new showdown.Converter();
 
     it('_setMetadataPair() should set foo to bar', function () {
       converter._setMetadataPair('foo', 'bar');
@@ -47,18 +46,18 @@ describe('showdown.Converter', function () {
      * Test setFlavor('github')
      */
     describe('github', function () {
-      var converter = new showdown.Converter(),
+      let converter = new showdown.Converter(),
           ghOpts = showdown.getFlavorOptions('github');
 
       converter.setFlavor('github');
 
-      for (var opt in ghOpts) {
+      for (let opt in ghOpts) {
         if (ghOpts.hasOwnProperty(opt)) {
           check(opt, ghOpts[opt]);
         }
       }
       function check (key, val) {
-        it('should set ' + opt + ' to ' + val, function () {
+        it('should set ' + key + ' to ' + val, function () {
           converter.getOption(key).should.equal(val);
         });
       }
@@ -72,19 +71,19 @@ describe('showdown.Converter', function () {
 
     describe('flavor', function () {
       it('should be vanilla by default', function () {
-        var converter = new showdown.Converter();
+        let converter = new showdown.Converter();
         converter.getFlavor().should.equal('vanilla');
       });
 
       it('should be changed if global option is changed', function () {
         showdown.setFlavor('github');
-        var converter = new showdown.Converter();
+        let converter = new showdown.Converter();
         converter.getFlavor().should.equal('github');
         showdown.setFlavor('vanilla');
       });
 
       it('should not be changed if converter is initialized before global change', function () {
-        var converter = new showdown.Converter();
+        let converter = new showdown.Converter();
         showdown.setFlavor('github');
         converter.getFlavor().should.equal('vanilla');
         showdown.setFlavor('vanilla');
@@ -93,7 +92,7 @@ describe('showdown.Converter', function () {
   });
 
   describe('extension methods', function () {
-    var extObjMock = {
+    let extObjMock = {
           type: 'lang',
           filter: function () {}
         },
@@ -102,13 +101,13 @@ describe('showdown.Converter', function () {
         };
 
     it('addExtension() should add an extension Object', function () {
-      var converter = new showdown.Converter();
+      let converter = new showdown.Converter();
       converter.addExtension(extObjMock);
       converter.getAllExtensions().language.should.contain(extObjMock);
     });
 
     it('addExtension() should unwrap an extension wrapped in a function', function () {
-      var converter = new showdown.Converter();
+      let converter = new showdown.Converter();
 
       converter.addExtension(extObjFunc);
       converter.getAllExtensions().language.should.contain(extObjMock);
@@ -116,7 +115,7 @@ describe('showdown.Converter', function () {
 
     it('useExtension() should use a previous registered extension in showdown', function () {
       showdown.extension('foo', extObjMock);
-      var converter = new showdown.Converter();
+      let converter = new showdown.Converter();
 
       converter.useExtension('foo');
       converter.getAllExtensions().language.should.contain(extObjMock);
@@ -124,7 +123,7 @@ describe('showdown.Converter', function () {
     });
 
     it('removeExtension() should remove an added extension', function () {
-      var converter = new showdown.Converter();
+      let converter = new showdown.Converter();
       converter.addExtension(extObjMock);
 
       converter.removeExtension(extObjMock);
@@ -133,7 +132,7 @@ describe('showdown.Converter', function () {
   });
 
   describe('events', function () {
-    var events = [
+    let events = [
       'makehtml.anchors',
       'makehtml.autoLinks',
       'makehtml.blockGamut',
@@ -151,17 +150,17 @@ describe('showdown.Converter', function () {
       //'tables'
     ];
 
-    for (var i = 0; i < events.length; ++i) {
+    for (let i = 0; i < events.length; ++i) {
       runListener(events[i] + '.before');
       runListener(events[i] + '.after');
     }
 
     function runListener (name) {
       it('should listen to ' + name, function () {
-        var converter = new showdown.Converter();
+        let converter = new showdown.Converter();
         converter.listen(name, function (event) {
-          var evtName = event.getName();
-          var text = event.getCapturedText();
+          let evtName = event.getName();
+          let text = event.getCapturedText();
           evtName.should.equal(name.toLowerCase());
           text.should.match(/^[\s\S]*foo[\s\S]*$/);
           return text;
diff --git a/test/unit/showdown.Converter.makeHtml.js b/test/unit/showdown.Converter.makeHtml.js
index 26a9f59..4715ac4 100644
--- a/test/unit/showdown.Converter.makeHtml.js
+++ b/test/unit/showdown.Converter.makeHtml.js
@@ -1,16 +1,15 @@
 /**
- * Created by Estevao on 15-01-2015.
+ * Created by Tivie on 15-01-2015.
  */
-require('source-map-support').install();
-require('chai').should();
-require('sinon');
-var showdown = require('../../.build/showdown.js');
+//let showdown = require('../../.build/showdown.js') || require('showdown');
+chai.should();
+
 
 describe('showdown.Converter', function () {
   'use strict';
 
   describe('Converter.options extensions', function () {
-    var runCount;
+    let runCount;
     showdown.extension('testext', function () {
       return [{
         type: 'output',
@@ -21,7 +20,7 @@ describe('showdown.Converter', function () {
       }];
     });
 
-    var converter = new showdown.Converter({extensions: ['testext']});
+    let converter = new showdown.Converter({extensions: ['testext']});
 
     it('output extensions should run once', function () {
       runCount = 0;
@@ -31,36 +30,36 @@ describe('showdown.Converter', function () {
   });
 
   describe('makeHtml() with option omitExtraWLInCodeBlocks', function () {
-    var converter = new showdown.Converter({omitExtraWLInCodeBlocks: true}),
+    let converter = new showdown.Converter({omitExtraWLInCodeBlocks: true}),
         text = 'var foo = bar;',
         html = converter.makeHtml('    ' + text);
     it('should omit extra line after code tag', function () {
-      var expectedHtml = '<pre><code>' + text + '</code></pre>';
+      let expectedHtml = '<pre><code>' + text + '</code></pre>';
       html.should.equal(expectedHtml);
     });
   });
 
   describe('makeHtml() with option prefixHeaderId', function () {
-    var converter = new showdown.Converter(),
+    let converter = new showdown.Converter(),
         text = 'foo header';
 
     it('should prefix header id with "section"', function () {
       converter.setOption('prefixHeaderId', true);
-      var html = converter.makeHtml('# ' + text),
+      let html = converter.makeHtml('# ' + text),
           expectedHtml = '<h1 id="sectionfooheader">' + text + '</h1>';
       html.should.equal(expectedHtml);
     });
 
     it('should prefix header id with custom string', function () {
       converter.setOption('prefixHeaderId', 'blabla');
-      var html = converter.makeHtml('# ' + text),
+      let html = converter.makeHtml('# ' + text),
           expectedHtml = '<h1 id="blablafooheader">' + text + '</h1>';
       html.should.equal(expectedHtml);
     });
   });
 
   describe('makeHtml() with option metadata', function () {
-    var converter = new showdown.Converter(),
+    let converter = new showdown.Converter(),
         text1 =
           '---SIMPLE\n' +
           'foo: bar\n' +
@@ -75,7 +74,7 @@ describe('showdown.Converter', function () {
     it('should correctly set metadata', function () {
       converter.setOption('metadata', true);
 
-      var expectedHtml = '',
+      let expectedHtml = '',
           expectedObj = {foo: 'bar', baz: 'bazinga'},
           expectedRaw = 'foo: bar\nbaz: bazinga',
           expectedFormat = 'SIMPLE';
@@ -87,7 +86,7 @@ describe('showdown.Converter', function () {
 
     it('consecutive calls should reset metadata', function () {
       converter.makeHtml(text2);
-      var expectedObj = {a: 'b', c: '123'},
+      let expectedObj = {a: 'b', c: '123'},
           expectedRaw = 'a: b\nc: 123',
           expectedFormat = 'TIVIE';
       converter.getMetadata().should.eql(expectedObj);
diff --git a/test/unit/showdown.Converter.makeMarkdown.js b/test/unit/showdown.Converter.makeMarkdown.js
index 95e6e9c..2512764 100644
--- a/test/unit/showdown.Converter.makeMarkdown.js
+++ b/test/unit/showdown.Converter.makeMarkdown.js
@@ -1,21 +1,19 @@
 /**
  * Created by Estevao on 15-01-2015.
  */
-require('source-map-support').install();
-require('chai').should();
-require('sinon');
-var showdown = require('../../.build/showdown.js');
+//let showdown = require('../../.build/showdown.js') || require('showdown');
+chai.should();
 
 describe('showdown.Converter', function () {
   'use strict';
 
 
   describe('makeMarkdown()', function () {
-    var converter = new showdown.Converter();
+    let converter = new showdown.Converter();
 
     it('should parse a simple html string', function () {
-      var html = '<a href="/somefoo.html">a link</a>\n';
-      var md   = '[a link](</somefoo.html>)';
+      let html = '<a href="/somefoo.html">a link</a>\n';
+      let md   = '[a link](</somefoo.html>)';
 
       converter.makeMarkdown(html).should.equal(md);
     });
diff --git a/test/unit/showdown.helpers.js b/test/unit/showdown.helpers.js
index e4a4477..b76da71 100644
--- a/test/unit/showdown.helpers.js
+++ b/test/unit/showdown.helpers.js
@@ -1,10 +1,7 @@
 /**
  * Created by Tivie on 27/01/2017.
  */
-require('source-map-support').install();
-require('chai').should();
-require('sinon');
-var showdown = require('../../.build/showdown.js');
+chai.should();
 /*jshint expr: true*/
 /*jshint -W053 */
 /*jshint -W010 */
@@ -12,7 +9,7 @@ var showdown = require('../../.build/showdown.js');
 
 describe('encodeEmailAddress()', function () {
   'use strict';
-  var encoder = showdown.helper.encodeEmailAddress,
+  let encoder = showdown.helper.encodeEmailAddress,
       email = 'foobar@example.com',
       encodedEmail = encoder(email),
       encodedEmail2 = encoder(email);
@@ -26,7 +23,7 @@ describe('encodeEmailAddress()', function () {
   });
 
   it('should decode to original email', function () {
-    var decodedEmail = encodedEmail.replace(/&#(.+?);/g, function (wm, cc) {
+    let decodedEmail = encodedEmail.replace(/&#(.+?);/g, function (wm, cc) {
       if (cc.charAt(0) === 'x') {
         //hex
         return String.fromCharCode('0' + cc);
@@ -41,7 +38,7 @@ describe('encodeEmailAddress()', function () {
 
 describe('isString()', function () {
   'use strict';
-  var isString = showdown.helper.isString;
+  let isString = showdown.helper.isString;
 
   it('should return true for new String Object', function () {
     isString(new String('some string')).should.be.true;
@@ -70,7 +67,7 @@ describe('isString()', function () {
 
 describe('isFunction()', function () {
   'use strict';
-  var isFunction = showdown.helper.isFunction;
+  let isFunction = showdown.helper.isFunction;
 
   it('should return true for closures', function () {
     isFunction(function () {}).should.be.true;
@@ -81,8 +78,8 @@ describe('isFunction()', function () {
     isFunction(foo).should.be.true;
   });
 
-  it('should return true for function variables', function () {
-    var bar = function () {};
+  it('should return true for function letiables', function () {
+    let bar = function () {};
     isFunction(bar).should.be.true;
   });
 
@@ -101,14 +98,14 @@ describe('isFunction()', function () {
 
 describe('isArray()', function () {
   'use strict';
-  var isArray = showdown.helper.isArray;
+  let isArray = showdown.helper.isArray;
 
   it('should return true for short syntax arrays', function () {
     isArray([]).should.be.true;
   });
 
   it('should return true for array objects', function () {
-    var myArr = new Array();
+    let myArr = new Array();
     isArray(myArr).should.be.true;
   });
 
@@ -131,14 +128,14 @@ describe('isArray()', function () {
 
 describe('isUndefined()', function () {
   'use strict';
-  var isUndefined = showdown.helper.isUndefined;
+  let isUndefined = showdown.helper.isUndefined;
 
   it('should return true if nothing is passed', function () {
     isUndefined().should.be.true;
   });
 
-  it('should return true if a variable is initialized but not defined', function () {
-    var myVar;
+  it('should return true if a letiable is initialized but not defined', function () {
+    let myVar;
     isUndefined(myVar).should.be.true;
   });
 
@@ -168,15 +165,15 @@ describe('isUndefined()', function () {
 
 describe('stdExtName()', function () {
   'use strict';
-  var stdExtName = showdown.helper.stdExtName;
+  let stdExtName = showdown.helper.stdExtName;
 
   it('should remove certain chars', function () {
-    var str = 'bla_-  \nbla';
+    let str = 'bla_-  \nbla';
     //[_?*+\/\\.^-]
     stdExtName(str).should.not.match(/[_?*+\/\\.^-]/g);
   });
   it('should make everything lowercase', function () {
-    var str = 'BLABLA';
+    let str = 'BLABLA';
     //[_?*+\/\\.^-]
     stdExtName(str).should.equal('blabla');
   });
@@ -184,7 +181,7 @@ describe('stdExtName()', function () {
 
 describe('forEach()', function () {
   'use strict';
-  var forEach = showdown.helper.forEach;
+  let forEach = showdown.helper.forEach;
 
   it('should throw an error if first parameter is undefined', function () {
     (function () {forEach();}).should.throw('obj param is required');
@@ -207,7 +204,7 @@ describe('forEach()', function () {
   });
 
   it('should iterate array items', function () {
-    var myArray = ['banana', 'orange', 'grape'];
+    let myArray = ['banana', 'orange', 'grape'];
     forEach(myArray, function (val, key, obj) {
       key.should.be.a('number');
       (key % 1).should.equal(0);
@@ -217,7 +214,7 @@ describe('forEach()', function () {
   });
 
   it('should iterate over object properties', function () {
-    var myObj = {foo: 'banana', bar: 'orange', baz: 'grape'};
+    let myObj = {foo: 'banana', bar: 'orange', baz: 'grape'};
     forEach(myObj, function (val, key, obj) {
       myObj.should.have.ownProperty(key);
       val.should.equal(myObj[key]);
@@ -226,7 +223,7 @@ describe('forEach()', function () {
   });
 
   it('should iterate only over object own properties', function () {
-    var Obj1 = {foo: 'banana'},
+    let Obj1 = {foo: 'banana'},
         myObj = Object.create(Obj1);
     myObj.bar = 'orange';
     myObj.baz = 'grape';
@@ -244,10 +241,10 @@ describe('forEach()', function () {
 describe('matchRecursiveRegExp()', function () {
   'use strict';
 
-  var rRegExp = showdown.helper.matchRecursiveRegExp;
+  let rRegExp = showdown.helper.matchRecursiveRegExp;
 
   it('should match nested elements', function () {
-    var result = rRegExp('<div><div>a</div></div>', '<div\\b[^>]*>', '</div>', 'gim');
+    let result = rRegExp('<div><div>a</div></div>', '<div\\b[^>]*>', '</div>', 'gim');
     result.should.deep.equal([['<div><div>a</div></div>', '<div>a</div>', '<div>', '</div>']]);
   });
 
@@ -256,9 +253,11 @@ describe('matchRecursiveRegExp()', function () {
 describe('repeat()', function () {
   'use strict';
   it('work produce the same output as String.prototype.repeat()', function () {
-    var str = 'foo',
-        expected = str.repeat(100),
-        actual = showdown.helper.repeat(str, 100);
-    expected.should.equal(actual);
+    if (typeof String.prototype.repeat !== 'undefined') {
+      let str = 'foo',
+          expected = str.repeat(100),
+          actual = showdown.helper.repeat(str, 100);
+      expected.should.equal(actual);
+    }
   });
 });
diff --git a/test/unit/showdown.js b/test/unit/showdown.js
index 0d9cbf4..d96e9fc 100644
--- a/test/unit/showdown.js
+++ b/test/unit/showdown.js
@@ -1,9 +1,7 @@
-require('source-map-support').install();
-require('chai').should();
-require('sinon');
-var expect = require('chai').expect,
-    showdown = require('../../.build/showdown.js');
-
+/**
+ * Created by Tivie on 27/01/2017.
+ */
+//let showdown = require('../../.build/showdown.js') || require('showdown');
 
 describe('showdown.options', function () {
   'use strict';
@@ -19,7 +17,7 @@ describe('showdown.options', function () {
 
   describe('getDefaultOptions()', function () {
     it('should get default options', function () {
-      var opts = require('./optionswp.js').getDefaultOpts(true);
+      let opts = getDefaultOpts(true);
       expect(showdown.getDefaultOptions()).to.be.eql(opts);
     });
   });
@@ -28,7 +26,7 @@ describe('showdown.options', function () {
 describe('showdown.extension()', function () {
   'use strict';
 
-  var extObjMock = {
+  let extObjMock = {
         type: 'lang',
         filter: function () {}
       },
@@ -36,6 +34,8 @@ describe('showdown.extension()', function () {
         return extObjMock;
       };
 
+  /*
+  // very flimsy test
   describe('file loading', function () {
 
     beforeEach(function () {
@@ -52,7 +52,7 @@ describe('showdown.extension()', function () {
     });
 
   });
-
+  */
 
   describe('objects', function () {
     it('should register an extension object', function () {
@@ -77,14 +77,14 @@ describe('showdown.extension()', function () {
     });
 
     it('should refuse to register a generic object', function () {
-      var fn = function () {
+      let fn = function () {
         showdown.extension('foo', {});
       };
       expect(fn).to.throw();
     });
 
     it('should refuse to register an extension with invalid type', function () {
-      var fn = function () {
+      let fn = function () {
         showdown.extension('foo', {
           type: 'foo'
         });
@@ -93,7 +93,7 @@ describe('showdown.extension()', function () {
     });
 
     it('should refuse to register an extension without regex or filter', function () {
-      var fn = function () {
+      let fn = function () {
         showdown.extension('foo', {
           type: 'lang'
         });
@@ -102,7 +102,7 @@ describe('showdown.extension()', function () {
     });
 
     it('should refuse to register a listener extension without a listeners property', function () {
-      var fn = function () {
+      let fn = function () {
         showdown.extension('foo', {
           type: 'listener'
         });
@@ -120,7 +120,7 @@ describe('showdown.extension()', function () {
 
 describe('showdown.getAllExtensions()', function () {
   'use strict';
-  var extObjMock = {
+  let extObjMock = {
     type: 'lang',
     filter: function () {}
   };
@@ -141,9 +141,9 @@ describe('showdown.setFlavor()', function () {
 
   it('should set options correctly', function () {
     showdown.setFlavor('github');
-    var ghOpts = showdown.getFlavorOptions('github'),
+    let ghOpts = showdown.getFlavorOptions('github'),
         shOpts = showdown.getOptions();
-    for (var opt in ghOpts) {
+    for (let opt in ghOpts) {
       if (ghOpts.hasOwnProperty(opt)) {
         shOpts.should.have.property(opt);
         shOpts[opt].should.equal(ghOpts[opt]);
@@ -154,10 +154,10 @@ describe('showdown.setFlavor()', function () {
 
   it('should switch between flavors correctly', function () {
     showdown.setFlavor('github');
-    var ghOpts = showdown.getFlavorOptions('github'),
+    let ghOpts = showdown.getFlavorOptions('github'),
         shOpts = showdown.getOptions(),
         dfOpts = showdown.getDefaultOptions();
-    for (var opt in dfOpts) {
+    for (let opt in dfOpts) {
       if (ghOpts.hasOwnProperty(opt)) {
         shOpts[opt].should.equal(ghOpts[opt]);
       } else {
@@ -165,9 +165,9 @@ describe('showdown.setFlavor()', function () {
       }
     }
     showdown.setFlavor('original');
-    var orOpts = showdown.getFlavorOptions('original');
+    let orOpts = showdown.getFlavorOptions('original');
     shOpts = showdown.getOptions();
-    for (opt in dfOpts) {
+    for (let opt in dfOpts) {
       if (orOpts.hasOwnProperty(opt)) {
         shOpts[opt].should.equal(orOpts[opt]);
       } else {