diff --git a/package.json b/package.json
index f565729..bf887af 100644
--- a/package.json
+++ b/package.json
@@ -25,8 +25,8 @@
     "dev": "yarn dev-server --open",
     "dev-server": "webpack-dev-server --config src/__tests__/helpers/webpack.config.js",
     "build": "tsc",
-    "test": "jest",
-    "coverage": "mkdir coverage && nyc report --reporter=json > coverage/coverage.json",
+    "test": "webpack --config src/__tests__/helpers/webpack.config.js && jest",
+    "coverage": "mkdir -p coverage && nyc report --reporter=json > coverage/coverage.json",
     "release:beta": "npm run test && npm run build && standard-version --prerelease beta && npm publish --tag beta && git push --follow-tags",
     "release": "npm run test && npm run build && standard-version && npm publish && git push --follow-tags"
   },
diff --git a/src/__tests__/index.test.js b/src/__tests__/index.test.js
index 9fc2bd4..8389afb 100644
--- a/src/__tests__/index.test.js
+++ b/src/__tests__/index.test.js
@@ -29,7 +29,7 @@ afterAll(async function() {
   const jsCoverage = await page.coverage.stopJSCoverage();
   const v8toIstanbul = require('v8-to-istanbul');
   const fse = require('fs-extra');
-  const converter = v8toIstanbul('./src/index.ts');
+  const converter = v8toIstanbul('./src/__tests__/helpers/index.bundle.js');
   await converter.load();
   converter.applyCoverage(jsCoverage);
   await fse.outputFile(