diff --git a/tests/legacy-cli/e2e/tests/misc/dedupe-duplicate-modules.ts b/tests/legacy-cli/e2e/tests/misc/dedupe-duplicate-modules.ts
index 142fd28425ac..94dc569a3a8a 100644
--- a/tests/legacy-cli/e2e/tests/misc/dedupe-duplicate-modules.ts
+++ b/tests/legacy-cli/e2e/tests/misc/dedupe-duplicate-modules.ts
@@ -4,20 +4,20 @@ import { updateJsonFile } from '../../utils/project';
 import { expectToFail } from '../../utils/utils';
 
 export default async function () {
-    // Force duplicate modules
-    await updateJsonFile('package.json', json => {
-        json.dependencies = {
-            ...json.dependencies,
-            'tslib': '2.0.0',
-            'tslib-1': 'npm:tslib@1.13.0',
-            'tslib-1-copy': 'npm:tslib@1.13.0',
-        };
-    });
+  // Force duplicate modules
+  await updateJsonFile('package.json', json => {
+    json.dependencies = {
+      ...json.dependencies,
+      'tslib': '2.0.0',
+      'tslib-1': 'npm:tslib@1.13.0',
+      'tslib-1-copy': 'npm:tslib@1.13.0',
+    };
+  });
 
-    await silentNpm('install');
+  await silentNpm('install');
 
-    await writeFile('./src/main.ts',
-        `
+  await writeFile('./src/main.ts',
+    `
         import { __assign as __assign_0 } from 'tslib';
         import { __assign as __assign_1 } from 'tslib-1';
         import { __assign as __assign_2 } from 'tslib-1-copy';
@@ -29,13 +29,19 @@ export default async function () {
         })
     `);
 
-    const { stderr } = await ng('build', '--verbose', '--no-vendor-chunk', '--no-progress');
-    if (!/\[DedupeModuleResolvePlugin\]:.+tslib-1-copy -> .+tslib-1/.test(stderr)) {
-        throw new Error('Expected stderr to contain [DedupeModuleResolvePlugin] log for tslib.');
-    }
+  const { stderr } = await ng('build', '--verbose', '--no-vendor-chunk', '--no-progress');
+  const outFile = 'dist/test-project/main.js';
 
-    const outFile = 'dist/test-project/main.js';
-    await expectFileToMatch(outFile, './node_modules/tslib/tslib.es6.js');
+  if (/\[DedupeModuleResolvePlugin\]:.+tslib-1-copy -> .+tslib-1/.test(stderr)) {
     await expectFileToMatch(outFile, './node_modules/tslib-1/tslib.es6.js');
     await expectToFail(() => expectFileToMatch(outFile, './node_modules/tslib-1-copy/tslib.es6.js'));
+  } else if (/\[DedupeModuleResolvePlugin\]:.+tslib-1 -> .+tslib-1-copy/.test(stderr)) {
+    await expectFileToMatch(outFile, './node_modules/tslib-1-copy/tslib.es6.js');
+    await expectToFail(() => expectFileToMatch(outFile, './node_modules/tslib-1/tslib.es6.js'));
+  } else {
+    console.error(`\n\n\n${stderr}\n\n\n`);
+    throw new Error('Expected stderr to contain [DedupeModuleResolvePlugin] log for tslib.');
+  }
+
+  await expectFileToMatch(outFile, './node_modules/tslib/tslib.es6.js');
 }