diff --git a/.circleci/config.yml b/.circleci/config.yml
index 7d93705..c4d2cb9 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -55,6 +55,9 @@ jobs:
       - run: &test 
           name: Test
           command: npm run shim:test
+      - run: &test_integration
+          name: Test-Integration
+          command: npm run shim:test-integration 
 
   lint_and_test_node_10:
     <<: *lint_and_test
diff --git a/src/utilities.js b/src/utilities.js
index 9084bc0..bef056d 100644
--- a/src/utilities.js
+++ b/src/utilities.js
@@ -31,7 +31,7 @@ export function assert(condition, message) {
 export function cleanupSource(src) {
   // Restore eval which is modified by esm module.
   // (0, eval) => (0, _<something>.e)
-  src = src.replace(/\(0, _[^.]+\.e\)/g, '(0, eval)');
+  src = src.replace(/\(0,\s*_[^.]+\.e\)/g, '(0, eval)');
 
   // Restore Reflect which is modified by esm module.
   // Reflect => _<something>.e.Reflect