diff --git a/package.json b/package.json
index 9a99437..22f47fa 100644
--- a/package.json
+++ b/package.json
@@ -23,7 +23,7 @@
         "lib": "src"
     },
     "scripts": {
-        "test": "node ./tests/test.js",
+        "test": "npm run build-full && node ./tests/test.cjs",
         "build": "rollup -c",
         "build-full": "rollup -c --environment FULL",
         "build-dev": "rollup -c rollup.config.dev.js",
diff --git a/tests/async/extends-async-iterator.js b/tests/async/extends-async-iterator.cjs
similarity index 100%
rename from tests/async/extends-async-iterator.js
rename to tests/async/extends-async-iterator.cjs
diff --git a/tests/sync/extends-iterator.js b/tests/sync/extends-iterator.cjs
similarity index 100%
rename from tests/sync/extends-iterator.js
rename to tests/sync/extends-iterator.cjs
diff --git a/tests/sync/from-iterable.js b/tests/sync/from-iterable.cjs
similarity index 100%
rename from tests/sync/from-iterable.js
rename to tests/sync/from-iterable.cjs
diff --git a/tests/sync/from-iterator.js b/tests/sync/from-iterator.cjs
similarity index 100%
rename from tests/sync/from-iterator.js
rename to tests/sync/from-iterator.cjs
diff --git a/tests/sync/instance-of-iterator.js b/tests/sync/instance-of-iterator.cjs
similarity index 100%
rename from tests/sync/instance-of-iterator.js
rename to tests/sync/instance-of-iterator.cjs
diff --git a/tests/sync/iterator-prototype-@@toStringTag.js b/tests/sync/iterator-prototype-@@toStringTag.cjs
similarity index 100%
rename from tests/sync/iterator-prototype-@@toStringTag.js
rename to tests/sync/iterator-prototype-@@toStringTag.cjs
diff --git a/tests/sync/iterator-prototype-asIndexedPairs.js b/tests/sync/iterator-prototype-asIndexedPairs.cjs
similarity index 100%
rename from tests/sync/iterator-prototype-asIndexedPairs.js
rename to tests/sync/iterator-prototype-asIndexedPairs.cjs
diff --git a/tests/sync/iterator-prototype-drop.js b/tests/sync/iterator-prototype-drop.cjs
similarity index 100%
rename from tests/sync/iterator-prototype-drop.js
rename to tests/sync/iterator-prototype-drop.cjs
diff --git a/tests/sync/iterator-prototype-every.js b/tests/sync/iterator-prototype-every.cjs
similarity index 100%
rename from tests/sync/iterator-prototype-every.js
rename to tests/sync/iterator-prototype-every.cjs
diff --git a/tests/sync/iterator-prototype-filter.js b/tests/sync/iterator-prototype-filter.cjs
similarity index 100%
rename from tests/sync/iterator-prototype-filter.js
rename to tests/sync/iterator-prototype-filter.cjs
diff --git a/tests/sync/iterator-prototype-find.js b/tests/sync/iterator-prototype-find.cjs
similarity index 100%
rename from tests/sync/iterator-prototype-find.js
rename to tests/sync/iterator-prototype-find.cjs
diff --git a/tests/sync/iterator-prototype-flatMap.js b/tests/sync/iterator-prototype-flatMap.cjs
similarity index 100%
rename from tests/sync/iterator-prototype-flatMap.js
rename to tests/sync/iterator-prototype-flatMap.cjs
diff --git a/tests/sync/iterator-prototype-forEach.js b/tests/sync/iterator-prototype-forEach.cjs
similarity index 100%
rename from tests/sync/iterator-prototype-forEach.js
rename to tests/sync/iterator-prototype-forEach.cjs
diff --git a/tests/sync/iterator-prototype-map.js b/tests/sync/iterator-prototype-map.cjs
similarity index 100%
rename from tests/sync/iterator-prototype-map.js
rename to tests/sync/iterator-prototype-map.cjs
diff --git a/tests/sync/iterator-prototype-reduce.js b/tests/sync/iterator-prototype-reduce.cjs
similarity index 100%
rename from tests/sync/iterator-prototype-reduce.js
rename to tests/sync/iterator-prototype-reduce.cjs
diff --git a/tests/sync/iterator-prototype-some.js b/tests/sync/iterator-prototype-some.cjs
similarity index 100%
rename from tests/sync/iterator-prototype-some.js
rename to tests/sync/iterator-prototype-some.cjs
diff --git a/tests/sync/iterator-prototype-take.js b/tests/sync/iterator-prototype-take.cjs
similarity index 100%
rename from tests/sync/iterator-prototype-take.js
rename to tests/sync/iterator-prototype-take.cjs
diff --git a/tests/sync/iterator-prototype-toArray.js b/tests/sync/iterator-prototype-toArray.cjs
similarity index 100%
rename from tests/sync/iterator-prototype-toArray.js
rename to tests/sync/iterator-prototype-toArray.cjs
diff --git a/tests/test.js b/tests/test.cjs
similarity index 93%
rename from tests/test.js
rename to tests/test.cjs
index c9bee4e..7dd35b9 100644
--- a/tests/test.js
+++ b/tests/test.cjs
@@ -1,4 +1,4 @@
-require('..');
+require('../build/bundle.min.cjs').installIntoGlobal();
 const { readdirSync } = require("fs");
 const { join } = require("path");
 
@@ -25,4 +25,3 @@ const { join } = require("path");
         }
     }
 })();
-module.exports = null;