From fc3458fde329d0ec8639041f26b3f6bc37564d1e Mon Sep 17 00:00:00 2001
From: Charles Lyding <19598772+clydin@users.noreply.github.com>
Date: Tue, 2 Sep 2025 12:44:24 -0400
Subject: [PATCH] fix(@angular/build): maintain media output hashing with
 vitest unit-testing

To ensure that output media files do not overwrite each other if source
media files use the same base file name but are contained in different
directories, the output hashing option from the build target will now keep
the `media` option enabled if configured.
---
 .../unit-test/runners/vitest/build-options.ts       | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/packages/angular/build/src/builders/unit-test/runners/vitest/build-options.ts b/packages/angular/build/src/builders/unit-test/runners/vitest/build-options.ts
index 1d08bb4c156f..d0bb6fb9078b 100644
--- a/packages/angular/build/src/builders/unit-test/runners/vitest/build-options.ts
+++ b/packages/angular/build/src/builders/unit-test/runners/vitest/build-options.ts
@@ -46,6 +46,17 @@ function createTestBedInitVirtualFile(
   `;
 }
 
+function adjustOutputHashing(hashing?: OutputHashing): OutputHashing {
+  switch (hashing) {
+    case OutputHashing.All:
+    case OutputHashing.Media:
+      // Ensure media is continued to be hashed to avoid overwriting of output media files
+      return OutputHashing.Media;
+    default:
+      return OutputHashing.None;
+  }
+}
+
 export async function getVitestBuildOptions(
   options: NormalizedUnitTestBuilderOptions,
   baseBuildOptions: Partial<ApplicationBuilderInternalOptions>,
@@ -82,7 +93,7 @@ export async function getVitestBuildOptions(
     ssr: false,
     prerender: false,
     sourceMap: { scripts: true, vendor: false, styles: false },
-    outputHashing: OutputHashing.None,
+    outputHashing: adjustOutputHashing(baseBuildOptions.outputHashing),
     optimization: false,
     tsConfig,
     entryPoints,