From c829746b1fa6999d1eef840a313d67f83fff68d8 Mon Sep 17 00:00:00 2001
From: Charles Lyding <19598772+clydin@users.noreply.github.com>
Date: Thu, 6 Nov 2025 10:31:23 -0500
Subject: [PATCH] fix(@angular/build): show full aggregate errors from vitest

Vitest may throw an `AggregateError` which can contain one or more specific
errors. The output console logging will now show each of these specific
errors in addition to the main thrown error.
---
 packages/angular/build/src/builders/unit-test/builder.ts | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/packages/angular/build/src/builders/unit-test/builder.ts b/packages/angular/build/src/builders/unit-test/builder.ts
index 105e34b8a72c..122039595bd9 100644
--- a/packages/angular/build/src/builders/unit-test/builder.ts
+++ b/packages/angular/build/src/builders/unit-test/builder.ts
@@ -146,6 +146,13 @@ async function* runBuildAndTest(
     } catch (e) {
       assertIsError(e);
       context.logger.error(`An exception occurred during test execution:\n${e.stack ?? e.message}`);
+      if (e instanceof AggregateError) {
+        e.errors.forEach((inner) => {
+          assertIsError(inner);
+          context.logger.error(inner.stack ?? inner.message);
+        });
+      }
+
       yield { success: false };
       consecutiveErrorCount++;
     }