diff --git a/test/index.test.js b/test/index.test.js
index c5b41c26c..d6fbfefb4 100644
--- a/test/index.test.js
+++ b/test/index.test.js
@@ -6,10 +6,9 @@ const { dirname } = require("path");
 
 const sourceMapSources = {};
 if (!global.coverage) {
-  require('source-map-support').install({
-    retrieveSourceMap (source) {
-      if (!sourceMapSources[source])
-        return null;
+  require("source-map-support").install({
+    retrieveSourceMap(source) {
+      if (!sourceMapSources[source]) return null;
 
       return {
         url: source,
@@ -21,49 +20,54 @@ if (!global.coverage) {
 
 for (const unitTest of fs.readdirSync(`${__dirname}/unit`)) {
   it(`should generate correct output for ${unitTest}`, async () => {
-    const expected = fs.readFileSync(`${__dirname}/unit/${unitTest}/output.js`)
-        .toString().trim()
-        // Windows support
-        .replace(/\r/g, '');
-    await ncc(`${__dirname}/unit/${unitTest}/input.js`, { minify: false }).then(async ({ code, assets }) => {
-      // very simple asset validation in unit tests
-      if (unitTest.startsWith('asset-')) {
-        expect(Object.keys(assets).length).toBeGreaterThan(0);
-        expect(assets[Object.keys(assets)[0]] instanceof Buffer);
-      }
-      const actual = code.trim()
+    const expected = fs
+      .readFileSync(`${__dirname}/unit/${unitTest}/output.js`)
+      .toString()
+      .trim()
       // Windows support
-      .replace(/\r/g, '');
-      try {
-        expect(actual).toBe(expected);
-      }
-      catch (e) {
-        // useful for updating fixtures
-        fs.writeFileSync(`${__dirname}/unit/${unitTest}/actual.js`, actual);
-        throw e;
+      .replace(/\r/g, "");
+    await ncc(`${__dirname}/unit/${unitTest}/input.js`, { minify: false }).then(
+      async ({ code, assets }) => {
+        // very simple asset validation in unit tests
+        if (unitTest.startsWith("asset-")) {
+          expect(Object.keys(assets).length).toBeGreaterThan(0);
+          expect(assets[Object.keys(assets)[0]] instanceof Buffer);
+        }
+        const actual = code
+          .trim()
+          // Windows support
+          .replace(/\r/g, "");
+        try {
+          expect(actual).toBe(expected);
+        } catch (e) {
+          // useful for updating fixtures
+          fs.writeFileSync(`${__dirname}/unit/${unitTest}/actual.js`, actual);
+          throw e;
+        }
       }
-    });
+    );
   });
 }
 
 // the twilio test can take a while (large codebase)
 jest.setTimeout(30000);
 
-function clearTmp () {
+function clearTmp() {
   try {
     rimraf.sync(__dirname + "/tmp");
-  }
-  catch (e) {
-    if (e.code !== "ENOENT")
-      throw e;
+  } catch (e) {
+    if (e.code !== "ENOENT") throw e;
   }
 }
 
 for (const integrationTest of fs.readdirSync(__dirname + "/integration")) {
   // ignore e.g.: `.json` files
-  if (!integrationTest.endsWith(".js")) continue;
+  if (!/\.(mjs|tsx?|js)$/.test(integrationTest)) continue;
   it(`should evaluate ${integrationTest} without errors`, async () => {
-    const { code, map, assets } = await ncc(__dirname + "/integration/" + integrationTest, { sourceMap: true });
+    const { code, map, assets } = await ncc(
+      __dirname + "/integration/" + integrationTest,
+      { sourceMap: true }
+    );
     module.exports = null;
     sourceMapSources[integrationTest] = map;
     // integration tests will load assets relative to __dirname
@@ -76,20 +80,23 @@ for (const integrationTest of fs.readdirSync(__dirname + "/integration")) {
     (__dirname => {
       try {
         eval(`${code}\n//# sourceURL=${integrationTest}`);
-      }
-      catch (e) {
+      } catch (e) {
         // useful for debugging
         mkdirp.sync(__dirname);
         fs.writeFileSync(__dirname + "/index.js", code);
         throw e;
       }
     })(__dirname + "/tmp");
-    if ("function" !== typeof module.exports) {
+    const exp =
+      module.exports && module.exports.default
+        ? module.exports.default
+        : module.exports;
+    if ("function" !== typeof exp) {
       throw new Error(
         `Integration test "${integrationTest}" evaluation failed. It does not export a function`
       );
     }
-    await module.exports();
+    await exp();
   });
 }