diff --git a/.gitignore b/.gitignore
index 678407e..b4a8012 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,6 +7,9 @@ node_modules/
 coverage/
 __build__/
 
+# coverage
+/.nyc_output
+
 # local env files
 .env.local
 .env.*.local
diff --git a/jest-puppeteer.config.js b/jest-puppeteer.config.js
index b866272..896d807 100644
--- a/jest-puppeteer.config.js
+++ b/jest-puppeteer.config.js
@@ -1,4 +1,14 @@
+const { TEST_SERVER_PORT } = process.env;
+const port = TEST_SERVER_PORT ? Number(TEST_SERVER_PORT) : 8080;
+
+process.env.TEST_SERVER_PORT = port;
+
 module.exports = {
   browser: 'chromium',
   browserContext: 'incognito',
+  server: {
+    command: `cross-env TEST_SERVER_PORT=${port} node jest-test-server`,
+    port,
+    launchTimeout: 4000,
+  },
 };
diff --git a/jest-puppeteer.env.js b/jest-puppeteer.env.js
index fde3e9e..c0a105d 100644
--- a/jest-puppeteer.env.js
+++ b/jest-puppeteer.env.js
@@ -1,13 +1,35 @@
-const PuppeteerRollupEnvironment = require('./jest-puppeteer.env.rollup.js');
+const PuppeteerEnvironment = require('jest-environment-puppeteer');
+const pti = require('puppeteer-to-istanbul');
+const { setupRollupTest, cleanupRollupTest } = require('./jest-puppeteer.rollup.js');
+
+class PuppeteerRollupEnvironment extends PuppeteerEnvironment {
+  constructor(envConfig, envContext) {
+    super(envConfig, envContext);
+
+    this.ctx = envContext;
+    this.cfg = envConfig;
+  }
 
-class CustomEnvironment extends PuppeteerRollupEnvironment {
   async setup() {
+    // setup
+    await setupRollupTest(this.ctx.testPath, this.cfg.cache, this.cfg.cacheDirectory);
     await super.setup();
+
+    // coverage
+    const { page } = this.global;
+    await Promise.all([page.coverage.startCSSCoverage(), page.coverage.startJSCoverage()]);
   }
 
   async teardown() {
+    // coverage
+    const { page } = this.global;
+    const [jsCoverage, cssCoverage] = await Promise.all([page.coverage.stopJSCoverage(), page.coverage.stopCSSCoverage()]);
+    pti.write([...jsCoverage, ...cssCoverage], { includeHostname: true, storagePath: './.nyc_output' });
+
+    // cleanup
+    cleanupRollupTest(this.ctx.testPath, this.cfg.cache);
     await super.teardown();
   }
 }
 
-module.exports = CustomEnvironment;
+module.exports = PuppeteerRollupEnvironment;
diff --git a/jest-puppeteer.rollup.config.js b/jest-puppeteer.rollup.config.js
new file mode 100644
index 0000000..e914fc3
--- /dev/null
+++ b/jest-puppeteer.rollup.config.js
@@ -0,0 +1,11 @@
+module.exports = {
+  build: '__build__',
+  html: {
+    input: 'index.html',
+    output: 'build.html',
+  },
+  js: {
+    input: 'index',
+    output: 'build',
+  },
+};
diff --git a/jest-puppeteer.env.rollup.js b/jest-puppeteer.rollup.js
similarity index 72%
rename from jest-puppeteer.env.rollup.js
rename to jest-puppeteer.rollup.js
index 87062c5..c09cb88 100644
--- a/jest-puppeteer.env.rollup.js
+++ b/jest-puppeteer.rollup.js
@@ -1,4 +1,3 @@
-const PuppeteerEnvironment = require('jest-environment-puppeteer');
 const fs = require('fs');
 const crypto = require('crypto');
 const path = require('path');
@@ -8,15 +7,12 @@ const rollupPluginHtml = require('@rollup/plugin-html');
 const rollupPluginStyles = require('rollup-plugin-styles');
 const rollupConfig = require('./rollup.config.js');
 const resolve = require('./resolve.config.json');
+const config = require('./jest-puppeteer.rollup.config.js');
 
-const rollupInputHtmlFile = 'index.html';
-const rollupInputFile = 'index';
-const rollupOutputHtmlFile = 'build.html';
-const rollupOutputFile = 'build';
-const rollupOutputDir = '__build__';
 const rollupNodeEnv = 'build';
 const cacheFilePrefix = 'jest-puppeteer-overlayscrollbars-cache-';
-const encoding = 'utf8';
+const cacheEncoding = 'utf8';
+const cacheHash = 'md5';
 
 const makeHtmlAttributes = (attributes) => {
   if (!attributes) {
@@ -57,7 +53,7 @@ const genHtmlTemplateFunc = (content) => ({ attributes, files, meta, publicPath,
 const getAllFilesFrom = (dir, except) => {
   const result = [];
   fs.readdirSync(dir).forEach((dirOrFile) => {
-    if (dirOrFile !== except) {
+    if (!except.includes(dirOrFile)) {
       const dirOrFileResolved = path.resolve(dir, dirOrFile);
       if (fs.statSync(dirOrFileResolved).isDirectory()) {
         result.push(...getAllFilesFrom(dirOrFileResolved));
@@ -68,23 +64,24 @@ const getAllFilesFrom = (dir, except) => {
   return result;
 };
 
-const createCacheObj = (testDir) => {
-  const testFiles = getAllFilesFrom(testDir, rollupOutputDir);
+const createCacheObj = (testPath) => {
+  const testFileName = path.basename(testPath);
+  const testFiles = getAllFilesFrom(path.dirname(testPath), [config.build, testFileName]);
   const obj = {};
 
   testFiles.forEach((dir) => {
-    obj[dir] = crypto.createHash('md5').update(fs.readFileSync(dir, encoding), encoding).digest('hex');
+    obj[dir] = crypto.createHash(cacheHash).update(fs.readFileSync(dir, cacheEncoding), cacheEncoding).digest('hex');
   });
 
   return obj;
 };
 
-const filesChanged = (testDir, cacheDir) => {
+const filesChanged = (testPath, cacheDir) => {
   let result = true;
-  const cacheObjString = JSON.stringify(createCacheObj(testDir));
-  const getCacheFile = path.resolve(cacheDir, cacheFilePrefix + crypto.createHash('md5').update(testDir, encoding).digest('hex'));
+  const cacheObjString = JSON.stringify(createCacheObj(testPath));
+  const getCacheFile = path.resolve(cacheDir, cacheFilePrefix + crypto.createHash(cacheHash).update(testPath, cacheEncoding).digest('hex'));
   if (fs.existsSync(getCacheFile)) {
-    result = cacheObjString !== fs.readFileSync(getCacheFile, encoding);
+    result = cacheObjString !== fs.readFileSync(getCacheFile, cacheEncoding);
   }
 
   if (result) {
@@ -97,9 +94,8 @@ const filesChanged = (testDir, cacheDir) => {
 const getRollupInfos = (testPath) => {
   const projectRootPath = path.resolve(__dirname, resolve.projectRoot);
   const testDir = path.dirname(testPath);
-  const input = path.resolve(testDir, rollupInputFile);
-  const dist = path.resolve(testDir, rollupOutputDir);
-  const file = rollupOutputFile;
+  const input = path.resolve(testDir, config.js.input);
+  const dist = path.resolve(testDir, config.build);
   const testName = path.basename(testDir);
 
   return {
@@ -108,15 +104,14 @@ const getRollupInfos = (testPath) => {
     testName,
     input,
     dist,
-    file,
   };
 };
 
 const setupRollupTest = async (testPath, cache, cacheDir) => {
-  const { projectRootPath, input, dist, file, testName, testDir } = getRollupInfos(testPath);
-  const changed = !cache || filesChanged(testDir, cacheDir);
+  const { projectRootPath, input, dist, testName, testDir } = getRollupInfos(testPath);
+  const changed = !cache || filesChanged(testPath, cacheDir);
 
-  if (changed || !fs.existsSync(path.resolve(testDir, rollupOutputDir))) {
+  if (changed || !fs.existsSync(path.resolve(testDir, config.build))) {
     const testPathSplit = path.relative(projectRootPath, testPath).split(path.sep);
     if (testPathSplit.length > 0) {
       const [project] = testPathSplit;
@@ -124,7 +119,7 @@ const setupRollupTest = async (testPath, cache, cacheDir) => {
 
       try {
         process.env.NODE_ENV = rollupNodeEnv;
-        const htmlFilePath = path.resolve(testDir, rollupInputHtmlFile);
+        const htmlFilePath = path.resolve(testDir, config.html.input);
         const htmlFileContent = fs.existsSync(htmlFilePath) ? fs.readFileSync(htmlFilePath, 'utf8') : null;
         let rollupConfigObj = rollupConfig(
           { 'config-project': project },
@@ -132,18 +127,18 @@ const setupRollupTest = async (testPath, cache, cacheDir) => {
             overwrite: {
               input,
               dist,
-              file,
+              file: config.js.output,
               types: null,
               minVersions: false,
               esmBuild: false,
-              sourcemap: false,
+              sourcemap: true,
               name: testName,
               pipeline: [
                 rollupPluginStyles(),
                 ...rollupConfig.defaults.pipeline,
                 rollupPluginHtml({
                   title: `Jest-Puppeteer: ${testName}`,
-                  fileName: rollupOutputHtmlFile,
+                  fileName: config.html.output,
                   template: genHtmlTemplateFunc(htmlFileContent),
                   meta: [{ charset: 'utf-8' }, { 'http-equiv': 'X-UA-Compatible', content: 'IE=edge' }],
                 }),
@@ -190,23 +185,4 @@ const cleanupRollupTest = (testPath, cache) => {
   }
 };
 
-class PuppeteerRollupEnvironment extends PuppeteerEnvironment {
-  constructor(config, context) {
-    super(config, context);
-
-    this.ctx = context;
-    this.cfg = config;
-  }
-
-  async setup() {
-    await setupRollupTest(this.ctx.testPath, this.cfg.cache, this.cfg.cacheDirectory);
-    await super.setup();
-  }
-
-  async teardown() {
-    cleanupRollupTest(this.ctx.testPath, this.cfg.cache);
-    await super.teardown();
-  }
-}
-
-module.exports = PuppeteerRollupEnvironment;
+module.exports = { setupRollupTest, cleanupRollupTest };
diff --git a/jest-test-server.js b/jest-test-server.js
new file mode 100644
index 0000000..5a6e937
--- /dev/null
+++ b/jest-test-server.js
@@ -0,0 +1,8 @@
+const path = require('path');
+const express = require('express');
+
+const app = express();
+
+app.use(express.static(path.join(__dirname, '.')));
+
+app.listen(process.env.TEST_SERVER_PORT);
diff --git a/jest-test-server.loader.js b/jest-test-server.loader.js
new file mode 100644
index 0000000..c06f06d
--- /dev/null
+++ b/jest-test-server.loader.js
@@ -0,0 +1,11 @@
+const path = require('path');
+
+module.exports = {
+  process: (src, filePath) => {
+    const deploymentPath = path.relative(__dirname, filePath);
+    const split = deploymentPath.split(path.sep);
+    const { TEST_SERVER_PORT } = process.env;
+
+    return `module.exports = ${JSON.stringify(`http://localhost:${TEST_SERVER_PORT}/${path.posix.join(...split)}`)}`;
+  },
+};
diff --git a/jest.config.js b/jest.config.js
index 2d451b2..f3bc335 100644
--- a/jest.config.js
+++ b/jest.config.js
@@ -1,4 +1,5 @@
 const resolve = require('./resolve.config');
+const puppeteerRollupConfig = require('./jest-puppeteer.rollup.config.js');
 
 // For a detailed explanation regarding each configuration property, visit:
 // https://jestjs.io/docs/en/configuration.html
@@ -27,9 +28,10 @@ module.exports = {
       setupFilesAfterEnv: ['expect-puppeteer'],
       testMatch: ['**/__tests__/puppeteer/**/*.test.[jt]s?(x)'],
       testEnvironment: './jest-puppeteer.env.js',
+      coveragePathIgnorePatterns: ['/node_modules/', `/${puppeteerRollupConfig.build}/`],
       transform: {
         '^.+\\.[jt]sx?$': 'babel-jest',
-        '^.+\\.html?$': 'html-loader-jest',
+        [`^.+${puppeteerRollupConfig.build}.+${puppeteerRollupConfig.html.output}?$`]: './jest-test-server.loader.js',
       },
     },
   ],
diff --git a/package-lock.json b/package-lock.json
index bc2c2a5..8a007c3 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -2993,6 +2993,16 @@
       "integrity": "sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q==",
       "dev": true
     },
+    "accepts": {
+      "version": "1.3.7",
+      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.7.tgz",
+      "integrity": "sha512-Il80Qs2WjYlJIBNzNkK6KYqlVMTbZLXgHx2oT0pU/fjRHyEp+PEfEPY0R3WCwAGVOtauxh1hOxNgIf5bv7dQpA==",
+      "dev": true,
+      "requires": {
+        "mime-types": "~2.1.24",
+        "negotiator": "0.6.2"
+      }
+    },
     "acorn": {
       "version": "7.3.1",
       "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.3.1.tgz",
@@ -3194,6 +3204,12 @@
       "integrity": "sha1-3wEKoSh+Fku9pvlyOwqWoexBh6E=",
       "dev": true
     },
+    "array-flatten": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz",
+      "integrity": "sha1-ml9pkFGx5wczKPKgCJaLZOopVdI=",
+      "dev": true
+    },
     "array-includes": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/array-includes/-/array-includes-3.1.1.tgz",
@@ -3259,12 +3275,6 @@
       "integrity": "sha1-WWZ/QfrdTyDMvCu5a41Pf3jsA2c=",
       "dev": true
     },
-    "ast-types": {
-      "version": "0.9.6",
-      "resolved": "https://registry.npmjs.org/ast-types/-/ast-types-0.9.6.tgz",
-      "integrity": "sha1-ECyenpAF0+fjgpvwxPok7oYu6bk=",
-      "dev": true
-    },
     "ast-types-flow": {
       "version": "0.0.7",
       "resolved": "https://registry.npmjs.org/ast-types-flow/-/ast-types-flow-0.0.7.tgz",
@@ -3544,12 +3554,6 @@
         "tweetnacl": "^0.14.3"
       }
     },
-    "big.js": {
-      "version": "5.2.2",
-      "resolved": "https://registry.npmjs.org/big.js/-/big.js-5.2.2.tgz",
-      "integrity": "sha512-vyL2OymJxmarO8gxMr0mhChsO9QGwhynfuu4+MHTAW6czfq9humCB7rKpUjDd9YUiDPU4mzpyupFSvOClAwbmQ==",
-      "dev": true
-    },
     "bl": {
       "version": "4.0.2",
       "resolved": "https://registry.npmjs.org/bl/-/bl-4.0.2.tgz",
@@ -3570,6 +3574,47 @@
         "inherits": "~2.0.0"
       }
     },
+    "body-parser": {
+      "version": "1.19.0",
+      "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.19.0.tgz",
+      "integrity": "sha512-dhEPs72UPbDnAQJ9ZKMNTP6ptJaionhP5cBb541nXPlW60Jepo9RV/a4fX4XWW9CuFNK22krhrj1+rgzifNCsw==",
+      "dev": true,
+      "requires": {
+        "bytes": "3.1.0",
+        "content-type": "~1.0.4",
+        "debug": "2.6.9",
+        "depd": "~1.1.2",
+        "http-errors": "1.7.2",
+        "iconv-lite": "0.4.24",
+        "on-finished": "~2.3.0",
+        "qs": "6.7.0",
+        "raw-body": "2.4.0",
+        "type-is": "~1.6.17"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "2.6.9",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
+          "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+          "dev": true,
+          "requires": {
+            "ms": "2.0.0"
+          }
+        },
+        "ms": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
+          "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g=",
+          "dev": true
+        },
+        "qs": {
+          "version": "6.7.0",
+          "resolved": "https://registry.npmjs.org/qs/-/qs-6.7.0.tgz",
+          "integrity": "sha512-VCdBRNFTX1fyE7Nb6FYoURo/SPe62QCaAyzJvUjwRaIsc+NePBEniHlvxFmmX56+HZphIGtV0XeCirBtpDrTyQ==",
+          "dev": true
+        }
+      }
+    },
     "boolbase": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/boolbase/-/boolbase-1.0.0.tgz",
@@ -3659,6 +3704,12 @@
       "integrity": "sha512-k0KL0aWZuBt2lrxrcASWDfwOLMnodeQjodT/1SxEQAXsHANgo6ZC/VEaSEHCXt7aSTZ4/4H5LKa+tBXmW7Vtvw==",
       "dev": true
     },
+    "bytes": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/bytes/-/bytes-3.1.0.tgz",
+      "integrity": "sha512-zauLjrfCG+xvoyaqLoV8bLVXXNGC4JqlxFCutSDWA6fJrTo2ZuvLYTqZ7aHBLZSMOopbzwv8f+wZcVzfVTI2Dg==",
+      "dev": true
+    },
     "cache-base": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/cache-base/-/cache-base-1.0.1.tgz",
@@ -3708,16 +3759,6 @@
       "integrity": "sha512-P8BjAsXvZS+VIDUI11hHCQEv74YT67YUi5JJFNWIqL235sBmjX4+qx9Muvls5ivyNENctx46xQLQ3aTuE7ssaQ==",
       "dev": true
     },
-    "camel-case": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/camel-case/-/camel-case-3.0.0.tgz",
-      "integrity": "sha1-yjw2iKTpzzpM2nd9xNy8cTJJz3M=",
-      "dev": true,
-      "requires": {
-        "no-case": "^2.2.0",
-        "upper-case": "^1.1.1"
-      }
-    },
     "camelcase": {
       "version": "5.3.1",
       "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-5.3.1.tgz",
@@ -3844,23 +3885,6 @@
         }
       }
     },
-    "clean-css": {
-      "version": "4.2.3",
-      "resolved": "https://registry.npmjs.org/clean-css/-/clean-css-4.2.3.tgz",
-      "integrity": "sha512-VcMWDN54ZN/DS+g58HYL5/n4Zrqe8vHJpGA8KdgUXFU4fuP/aHNw8eld9SyEIyabIMJX/0RaY/fplOo5hYLSFA==",
-      "dev": true,
-      "requires": {
-        "source-map": "~0.6.0"
-      },
-      "dependencies": {
-        "source-map": {
-          "version": "0.6.1",
-          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
-          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
-          "dev": true
-        }
-      }
-    },
     "clean-stack": {
       "version": "2.2.0",
       "resolved": "https://registry.npmjs.org/clean-stack/-/clean-stack-2.2.0.tgz",
@@ -3893,6 +3917,12 @@
         "wrap-ansi": "^6.2.0"
       }
     },
+    "clone": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/clone/-/clone-2.1.2.tgz",
+      "integrity": "sha1-G39Ln1kfHo+DZwQBYANFoCiHQ18=",
+      "dev": true
+    },
     "clone-deep": {
       "version": "0.2.4",
       "resolved": "https://registry.npmjs.org/clone-deep/-/clone-deep-0.2.4.tgz",
@@ -4048,6 +4078,21 @@
       "integrity": "sha1-/ozxhP9mcLa67wGp1IYaXL7EEgo=",
       "dev": true
     },
+    "content-disposition": {
+      "version": "0.5.3",
+      "resolved": "https://registry.npmjs.org/content-disposition/-/content-disposition-0.5.3.tgz",
+      "integrity": "sha512-ExO0774ikEObIAEV9kDo50o+79VCUdEB6n6lzKgGwupcVeRlhrj3qGAfwq8G6uBJjkqLrhT0qEYFcWng8z1z0g==",
+      "dev": true,
+      "requires": {
+        "safe-buffer": "5.1.2"
+      }
+    },
+    "content-type": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/content-type/-/content-type-1.0.4.tgz",
+      "integrity": "sha512-hIP3EEPs8tB9AT1L+NUqtwOAps4mk2Zob89MWXMHjHWg9milF/j4osnnQLXBCBFBk/tvIG/tUc9mOUJiPBhPXA==",
+      "dev": true
+    },
     "convert-source-map": {
       "version": "1.7.0",
       "resolved": "https://registry.npmjs.org/convert-source-map/-/convert-source-map-1.7.0.tgz",
@@ -4057,6 +4102,18 @@
         "safe-buffer": "~5.1.1"
       }
     },
+    "cookie": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/cookie/-/cookie-0.4.0.tgz",
+      "integrity": "sha512-+Hp8fLp57wnUSt0tY0tHEXh4voZRDnoIrZPqlo3DPiI4y9lwg/jqx+1Om94/W6ZaPDOUbnjOt/99w66zk+l1Xg==",
+      "dev": true
+    },
+    "cookie-signature": {
+      "version": "1.0.6",
+      "resolved": "https://registry.npmjs.org/cookie-signature/-/cookie-signature-1.0.6.tgz",
+      "integrity": "sha1-4wOogrNCzD7oylE6eZmXNNqzriw=",
+      "dev": true
+    },
     "copy-descriptor": {
       "version": "0.1.1",
       "resolved": "https://registry.npmjs.org/copy-descriptor/-/copy-descriptor-0.1.1.tgz",
@@ -4599,6 +4656,18 @@
       "integrity": "sha1-hMbhWbgZBP3KWaDvRM2HDTElD5o=",
       "dev": true
     },
+    "depd": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/depd/-/depd-1.1.2.tgz",
+      "integrity": "sha1-m81S4UwJd2PnSbJ0xDRu0uVgtak=",
+      "dev": true
+    },
+    "destroy": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/destroy/-/destroy-1.0.4.tgz",
+      "integrity": "sha1-l4hXRCxEdJ5CBmE+N5RiBYJqvYA=",
+      "dev": true
+    },
     "detect-libc": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/detect-libc/-/detect-libc-1.0.3.tgz",
@@ -4723,6 +4792,12 @@
         "safer-buffer": "^2.1.0"
       }
     },
+    "ee-first": {
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       "resolved": "https://registry.npmjs.org/pascalcase/-/pascalcase-0.1.1.tgz",
@@ -10899,6 +11044,12 @@
       "integrity": "sha512-GSmOT2EbHrINBf9SR7CDELwlJ8AENk3Qn7OikK4nFYAu3Ote2+JYNVvkpAEQm3/TLNEJFD/xZJjzyxg3KBWOzw==",
       "dev": true
     },
+    "path-to-regexp": {
+      "version": "0.1.7",
+      "resolved": "https://registry.npmjs.org/path-to-regexp/-/path-to-regexp-0.1.7.tgz",
+      "integrity": "sha1-32BBeABfUi8V60SQ5yR6G/qmf4w=",
+      "dev": true
+    },
     "path-type": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/path-type/-/path-type-4.0.0.tgz",
@@ -11735,12 +11886,6 @@
         }
       }
     },
-    "private": {
-      "version": "0.1.8",
-      "resolved": "https://registry.npmjs.org/private/-/private-0.1.8.tgz",
-      "integrity": "sha512-VvivMrbvd2nKkiG38qjULzlc+4Vx4wm/whI9pQD35YrARNnhxeiRktSOhSukRLFNlzg6Br/cJPet5J/u19r/mg==",
-      "dev": true
-    },
     "process-nextick-args": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/process-nextick-args/-/process-nextick-args-2.0.1.tgz",
@@ -11774,6 +11919,16 @@
         "react-is": "^16.8.1"
       }
     },
+    "proxy-addr": {
+      "version": "2.0.6",
+      "resolved": "https://registry.npmjs.org/proxy-addr/-/proxy-addr-2.0.6.tgz",
+      "integrity": "sha512-dh/frvCBVmSsDYzw6n926jv974gddhkFPfiN8hPOi30Wax25QZyZEGveluCgliBnqmuM+UJmBErbAUFIoDbjOw==",
+      "dev": true,
+      "requires": {
+        "forwarded": "~0.1.2",
+        "ipaddr.js": "1.9.1"
+      }
+    },
     "proxy-from-env": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/proxy-from-env/-/proxy-from-env-1.1.0.tgz",
@@ -11828,6 +11983,26 @@
         "ws": "^7.2.3"
       }
     },
+    "puppeteer-to-istanbul": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/puppeteer-to-istanbul/-/puppeteer-to-istanbul-1.4.0.tgz",
+      "integrity": "sha512-dzW8u/PMqMZppvoXCFod8IkCTI2JL0yP2YUBbaALnX+iJJ6gqjk77fIoK9MqnMqRZAcoa81GLFfZExakWg/Q4Q==",
+      "dev": true,
+      "requires": {
+        "clone": "^2.1.2",
+        "mkdirp": "^1.0.4",
+        "v8-to-istanbul": "^1.2.1",
+        "yargs": "^15.3.1"
+      },
+      "dependencies": {
+        "v8-to-istanbul": {
+          "version": "1.2.1",
+          "resolved": "https://registry.npmjs.org/v8-to-istanbul/-/v8-to-istanbul-1.2.1.tgz",
+          "integrity": "sha512-NglPycIwSQeSJj7VJ6L8vTsPKC9MG5Lcx4n3SvYqNHzklbMI4dGcLJnkLPEPJ3uB8UyTdWviMhM0Ptq+xD5UFQ==",
+          "dev": true
+        }
+      }
+    },
     "q": {
       "version": "1.5.1",
       "resolved": "https://registry.npmjs.org/q/-/q-1.5.1.tgz",
@@ -11849,6 +12024,24 @@
         "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": "2.4.0",
+      "resolved": "https://registry.npmjs.org/raw-body/-/raw-body-2.4.0.tgz",
+      "integrity": "sha512-4Oz8DUIwdvoa5qMJelxipzi/iJIi40O5cGV1wNYp5hvZP8ZN0T+jiNkL0QepXs+EsQ9XJ8ipEDoiH70ySUJP3Q==",
+      "dev": true,
+      "requires": {
+        "bytes": "3.1.0",
+        "http-errors": "1.7.2",
+        "iconv-lite": "0.4.24",
+        "unpipe": "1.0.0"
+      }
+    },
     "rc": {
       "version": "1.2.8",
       "resolved": "https://registry.npmjs.org/rc/-/rc-1.2.8.tgz",
@@ -11926,26 +12119,6 @@
         "util.promisify": "^1.0.0"
       }
     },
-    "recast": {
-      "version": "0.11.23",
-      "resolved": "https://registry.npmjs.org/recast/-/recast-0.11.23.tgz",
-      "integrity": "sha1-RR/TAEqx5N+bTktmN2sqIZEkYtM=",
-      "dev": true,
-      "requires": {
-        "ast-types": "0.9.6",
-        "esprima": "~3.1.0",
-        "private": "~0.1.5",
-        "source-map": "~0.5.0"
-      },
-      "dependencies": {
-        "esprima": {
-          "version": "3.1.3",
-          "resolved": "https://registry.npmjs.org/esprima/-/esprima-3.1.3.tgz",
-          "integrity": "sha1-/cpRzuYTOJXjyI1TXOSdv/YqRjM=",
-          "dev": true
-        }
-      }
-    },
     "redent": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/redent/-/redent-1.0.0.tgz",
@@ -12060,12 +12233,6 @@
         }
       }
     },
-    "relateurl": {
-      "version": "0.2.7",
-      "resolved": "https://registry.npmjs.org/relateurl/-/relateurl-0.2.7.tgz",
-      "integrity": "sha1-VNvzd+UUQKypCkzSdGANP/LYiKk=",
-      "dev": true
-    },
     "remove-trailing-separator": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/remove-trailing-separator/-/remove-trailing-separator-1.1.0.tgz",
@@ -12790,6 +12957,58 @@
       "integrity": "sha512-sauaDf/PZdVgrLTNYHRtpXa1iRiKcaebiKQ1BJdpQlWH2lCvexQdX55snPFyK7QzpudqbCI0qXFfOasHdyNDGQ==",
       "dev": true
     },
+    "send": {
+      "version": "0.17.1",
+      "resolved": "https://registry.npmjs.org/send/-/send-0.17.1.tgz",
+      "integrity": "sha512-BsVKsiGcQMFwT8UxypobUKyv7irCNRHk1T0G680vk88yf6LBByGcZJOTJCrTP2xVN6yI+XjPJcNuE3V4fT9sAg==",
+      "dev": true,
+      "requires": {
+        "debug": "2.6.9",
+        "depd": "~1.1.2",
+        "destroy": "~1.0.4",
+        "encodeurl": "~1.0.2",
+        "escape-html": "~1.0.3",
+        "etag": "~1.8.1",
+        "fresh": "0.5.2",
+        "http-errors": "~1.7.2",
+        "mime": "1.6.0",
+        "ms": "2.1.1",
+        "on-finished": "~2.3.0",
+        "range-parser": "~1.2.1",
+        "statuses": "~1.5.0"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "2.6.9",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
+          "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+          "dev": true,
+          "requires": {
+            "ms": "2.0.0"
+          },
+          "dependencies": {
+            "ms": {
+              "version": "2.0.0",
+              "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
+              "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g=",
+              "dev": true
+            }
+          }
+        },
+        "mime": {
+          "version": "1.6.0",
+          "resolved": "https://registry.npmjs.org/mime/-/mime-1.6.0.tgz",
+          "integrity": "sha512-x0Vn8spI+wuJ1O6S7gnbaQg8Pxh4NNHb7KSINmEWKiPE4RKOplvijn+NkmYmmRgP68mc70j2EbeTFRsrswaQeg==",
+          "dev": true
+        },
+        "ms": {
+          "version": "2.1.1",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.1.tgz",
+          "integrity": "sha512-tgp+dl5cGk28utYktBsrFqA7HKgrhgPsg6Z/EfhWI4gl1Hwq8B/GmY/0oXZ6nF8hDVesS/FpnYaD/kOWhYQvyg==",
+          "dev": true
+        }
+      }
+    },
     "serialize-javascript": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/serialize-javascript/-/serialize-javascript-3.1.0.tgz",
@@ -12799,6 +13018,18 @@
         "randombytes": "^2.1.0"
       }
     },
+    "serve-static": {
+      "version": "1.14.1",
+      "resolved": "https://registry.npmjs.org/serve-static/-/serve-static-1.14.1.tgz",
+      "integrity": "sha512-JMrvUwE54emCYWlTI+hGrGv5I8dEwmco/00EvkzIIsR7MqrHonbD9pO2MOfFnpFntl7ecpZs+3mW+XbQZu9QCg==",
+      "dev": true,
+      "requires": {
+        "encodeurl": "~1.0.2",
+        "escape-html": "~1.0.3",
+        "parseurl": "~1.3.3",
+        "send": "0.17.1"
+      }
+    },
     "set-blocking": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/set-blocking/-/set-blocking-2.0.0.tgz",
@@ -12828,6 +13059,12 @@
         }
       }
     },
+    "setprototypeof": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/setprototypeof/-/setprototypeof-1.1.1.tgz",
+      "integrity": "sha512-JvdAWfbXeIGaZ9cILp38HntZSFSo3mWg6xGcJJsd+d4aRMOqauag1C63dJfDw7OaMYwEbHMOxEZ1lqVRYP2OAw==",
+      "dev": true
+    },
     "shallow-clone": {
       "version": "0.1.2",
       "resolved": "https://registry.npmjs.org/shallow-clone/-/shallow-clone-0.1.2.tgz",
@@ -13251,6 +13488,12 @@
         }
       }
     },
+    "statuses": {
+      "version": "1.5.0",
+      "resolved": "https://registry.npmjs.org/statuses/-/statuses-1.5.0.tgz",
+      "integrity": "sha1-Fhx9rBd2Wf2YEfQ3cfqZOBR4Yow=",
+      "dev": true
+    },
     "stdout-stream": {
       "version": "1.4.1",
       "resolved": "https://registry.npmjs.org/stdout-stream/-/stdout-stream-1.4.1.tgz",
@@ -13741,6 +13984,12 @@
         "is-number": "^7.0.0"
       }
     },
+    "toidentifier": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/toidentifier/-/toidentifier-1.0.0.tgz",
+      "integrity": "sha512-yaOH/Pk/VEhBWWTlhI+qXxDFXlejDGcQipMlyxda9nthulaxLZUNcUqFxokp0vcYnvteJln5FNQDRrxj3YcbVw==",
+      "dev": true
+    },
     "tough-cookie": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-3.0.1.tgz",
@@ -13870,6 +14119,16 @@
       "integrity": "sha512-4dbzIzqvjtgiM5rw1k5rEHtBANKmdudhGyBEajN01fEyhaAIhsoKNy6y7+IN93IfpFtwY9iqi7kD+xwKhQsNJA==",
       "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-to-buffer": {
       "version": "3.1.5",
       "resolved": "https://registry.npmjs.org/typedarray-to-buffer/-/typedarray-to-buffer-3.1.5.tgz",
@@ -13885,30 +14144,6 @@
       "integrity": "sha512-BLbiRkiBzAwsjut4x/dsibSTB6yWpwT5qWmC2OfuCg3GgVQCSgMs4vEctYPhsaGtd0AeuuHMkjZ2h2WG8MSzRw==",
       "dev": true
     },
-    "uglify-js": {
-      "version": "3.4.10",
-      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.4.10.tgz",
-      "integrity": "sha512-Y2VsbPVs0FIshJztycsO2SfPk7/KAF/T72qzv9u5EpQ4kB2hQoHlhNQTsNyy6ul7lQtqJN/AoWeS23OzEiEFxw==",
-      "dev": true,
-      "requires": {
-        "commander": "~2.19.0",
-        "source-map": "~0.6.1"
-      },
-      "dependencies": {
-        "commander": {
-          "version": "2.19.0",
-          "resolved": "https://registry.npmjs.org/commander/-/commander-2.19.0.tgz",
-          "integrity": "sha512-6tvAOO+D6OENvRAh524Dh9jcfKTYDQAqvqezbCW82xj5X0pSrcpxtvRKHLG0yBY6SD7PSDrJaj+0AiOcKVd1Xg==",
-          "dev": true
-        },
-        "source-map": {
-          "version": "0.6.1",
-          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
-          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
-          "dev": true
-        }
-      }
-    },
     "unbzip2-stream": {
       "version": "1.4.3",
       "resolved": "https://registry.npmjs.org/unbzip2-stream/-/unbzip2-stream-1.4.3.tgz",
@@ -13977,6 +14212,12 @@
       "integrity": "sha512-rBJeI5CXAlmy1pV+617WB9J63U6XcazHHF2f2dbJix4XzpUF0RS3Zbj0FGIOCAva5P/d/GBOYaACQ1w+0azUkg==",
       "dev": true
     },
+    "unpipe": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
+      "integrity": "sha1-sr9O6FFKrmFltIF4KdIbLvSZBOw=",
+      "dev": true
+    },
     "unquote": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/unquote/-/unquote-1.1.1.tgz",
@@ -14023,12 +14264,6 @@
         }
       }
     },
-    "upper-case": {
-      "version": "1.1.3",
-      "resolved": "https://registry.npmjs.org/upper-case/-/upper-case-1.1.3.tgz",
-      "integrity": "sha1-9rRQHC7EzdJrp4vnIilh3ndiFZg=",
-      "dev": true
-    },
     "uri-js": {
       "version": "4.2.2",
       "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.2.2.tgz",
@@ -14077,6 +14312,12 @@
         "object.getownpropertydescriptors": "^2.1.0"
       }
     },
+    "utils-merge": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
+      "integrity": "sha1-n5VxD1CiZ5R7LMwSR0HBAoQn5xM=",
+      "dev": true
+    },
     "uuid": {
       "version": "7.0.3",
       "resolved": "https://registry.npmjs.org/uuid/-/uuid-7.0.3.tgz",
@@ -14119,6 +14360,12 @@
         "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
+    },
     "vendors": {
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/vendors/-/vendors-1.0.4.tgz",
diff --git a/package.json b/package.json
index 4295acb..d446649 100644
--- a/package.json
+++ b/package.json
@@ -35,14 +35,16 @@
     "eslint-plugin-react": "^7.20.3",
     "eslint-plugin-react-hooks": "^4.0.8",
     "expect-puppeteer": "^4.4.0",
-    "html-loader-jest": "^0.2.1",
+    "express": "^4.17.1",
     "jest": "^26.0.1",
+    "jest-dev-server": "^4.4.0",
     "jest-puppeteer": "^4.4.0",
     "mkdirp": "^1.0.4",
     "node-sass": "^4.14.1",
     "prettier": "^2.0.5",
     "prettier-eslint": "^11.0.0",
     "puppeteer": "^5.2.1",
+    "puppeteer-to-istanbul": "^1.4.0",
     "rollup": "^2.22.1",
     "rollup-plugin-prettier": "^2.1.0",
     "rollup-plugin-styles": "^3.10.0",
diff --git a/packages/overlayscrollbars/__tests__/puppeteer/Environment/index.test.ts b/packages/overlayscrollbars/__tests__/puppeteer/Environment/index.test.ts
index 2fb10eb..bc12236 100644
--- a/packages/overlayscrollbars/__tests__/puppeteer/Environment/index.test.ts
+++ b/packages/overlayscrollbars/__tests__/puppeteer/Environment/index.test.ts
@@ -1,8 +1,8 @@
-import html from './__build__/build.html';
+import url from './__build__/build.html';
 
 describe('Environment', () => {
   beforeAll(async () => {
-    await page.setContent(html, { waitUntil: 'domcontentloaded' });
+    await page.goto(url);
   });
 
   it('should be titled "Environment"', async () => {
diff --git a/packages/overlayscrollbars/__tests__/puppeteer/Environment/index.ts b/packages/overlayscrollbars/__tests__/puppeteer/Environment/index.ts
index 290b131..bf3c451 100644
--- a/packages/overlayscrollbars/__tests__/puppeteer/Environment/index.ts
+++ b/packages/overlayscrollbars/__tests__/puppeteer/Environment/index.ts
@@ -2,4 +2,6 @@ import { Environment } from 'environment';
 import 'some.scss';
 import 'some.css';
 
+document.body.append(JSON.stringify(new Environment()));
+
 export { Environment };