diff --git a/packages/integration-tests/fixtures/debug-ids-already-injected/debug-ids-already-injected.test.ts b/packages/integration-tests/fixtures/debug-ids-already-injected/debug-ids-already-injected.test.ts
index 8d6feca8..c88b05be 100644
--- a/packages/integration-tests/fixtures/debug-ids-already-injected/debug-ids-already-injected.test.ts
+++ b/packages/integration-tests/fixtures/debug-ids-already-injected/debug-ids-already-injected.test.ts
@@ -1,3 +1,4 @@
+/* eslint-disable jest/expect-expect */
 import * as path from "path";
 import * as fs from "fs";
 import * as os from "os";
@@ -11,23 +12,35 @@ function createTempDir() {
 const SPEC_DEBUG_ID_REGEX = /\/\/# debugId=([a-fA-F0-9-]+)/g;
 
 function countDebugIdComments(source: string): number {
-  const matches = source.match(SPEC_DEBUG_ID_REGEX);
-  if (matches) {
-    return matches.length;
+  return source.match(SPEC_DEBUG_ID_REGEX)?.length || 0;
+}
+
+function getDebugIdFromComment(source: string): string | undefined {
+  const match = SPEC_DEBUG_ID_REGEX.exec(source);
+  if (match && match[1]) {
+    return match[1];
   }
-  return 0;
+  return undefined;
 }
 
-function getSingleJavaScriptSourceFileFromDirectory(
-  dir: string,
-  fileExtension = ".js"
-): string | undefined {
+function getSingleJavaScriptSourceFileFromDirectory(dir: string, fileExtension = ".js"): string {
   const files = fs.readdirSync(dir);
   const jsFiles = files.filter((file) => file.endsWith(fileExtension));
   if (jsFiles.length === 1) {
     return fs.readFileSync(path.join(dir, jsFiles[0] as string), "utf-8");
   }
-  return undefined;
+  return "";
+}
+
+function expected(tempDir: string) {
+  const source = getSingleJavaScriptSourceFileFromDirectory(tempDir);
+  expect(source).toBeDefined();
+  const debugIds = countDebugIdComments(source);
+  expect(debugIds).toBe(1);
+  const debugId = getDebugIdFromComment(source);
+  expect(debugId).toBeDefined();
+  // Check the JavaScript contains a matching id
+  expect(source).toContain(`="${debugId || "fail"}"`);
 }
 
 describeNode18Plus("vite 6 bundle", () => {
@@ -44,10 +57,7 @@ describeNode18Plus("vite 6 bundle", () => {
   });
 
   test("check vite 6 bundle", () => {
-    const source = getSingleJavaScriptSourceFileFromDirectory(tempDir);
-    expect(source).toBeDefined();
-    const debugIds = countDebugIdComments(source as string);
-    expect(debugIds).toBe(1);
+    expected(tempDir);
   });
 
   afterEach(() => {
@@ -69,10 +79,7 @@ describeNode18Plus("webpack 5 bundle", () => {
   });
 
   test("check webpack 5 bundle", () => {
-    const source = getSingleJavaScriptSourceFileFromDirectory(tempDir);
-    expect(source).toBeDefined();
-    const debugIds = countDebugIdComments(source as string);
-    expect(debugIds).toBe(1);
+    expected(tempDir);
   });
 
   afterEach(() => {
@@ -94,10 +101,7 @@ describeNode18Plus("rollup bundle", () => {
   });
 
   test("check rollup bundle", () => {
-    const source = getSingleJavaScriptSourceFileFromDirectory(tempDir);
-    expect(source).toBeDefined();
-    const debugIds = countDebugIdComments(source as string);
-    expect(debugIds).toBe(1);
+    expected(tempDir);
   });
 
   afterEach(() => {