From 04a0c4ce80ac8fc96c6a8044413e4c42f677b9e5 Mon Sep 17 00:00:00 2001
From: Ian Clanton-Thuon <iclanton@users.noreply.github.com>
Date: Wed, 15 Jul 2026 18:43:57 -0400
Subject: [PATCH] Fix an issue that occurs when you run rush-lib tests twice
 without cleaning.

---
 .../fix-repeated-test-issue_2026-07-15-22-43-06.json   | 10 ++++++++++
 .../rush-lib/src/api/test/RushConfiguration.test.ts    |  2 +-
 2 files changed, 11 insertions(+), 1 deletion(-)
 create mode 100644 common/changes/@microsoft/rush/fix-repeated-test-issue_2026-07-15-22-43-06.json

diff --git a/common/changes/@microsoft/rush/fix-repeated-test-issue_2026-07-15-22-43-06.json b/common/changes/@microsoft/rush/fix-repeated-test-issue_2026-07-15-22-43-06.json
new file mode 100644
index 00000000000..bd7ff97cb34
--- /dev/null
+++ b/common/changes/@microsoft/rush/fix-repeated-test-issue_2026-07-15-22-43-06.json
@@ -0,0 +1,10 @@
+{
+  "changes": [
+    {
+      "packageName": "@microsoft/rush",
+      "comment": "",
+      "type": "none"
+    }
+  ],
+  "packageName": "@microsoft/rush"
+}
\ No newline at end of file
diff --git a/libraries/rush-lib/src/api/test/RushConfiguration.test.ts b/libraries/rush-lib/src/api/test/RushConfiguration.test.ts
index 6b90c8c2a10..ddcefbeafed 100644
--- a/libraries/rush-lib/src/api/test/RushConfiguration.test.ts
+++ b/libraries/rush-lib/src/api/test/RushConfiguration.test.ts
@@ -312,7 +312,7 @@ describe(RushConfiguration.name, () => {
       const rushConfiguration: RushConfiguration = RushConfiguration.loadFromConfigurationFile(
         `${__dirname}/repo/rush-pnpm.json`
       );
-      jest.spyOn(JsonFile, 'save').mockImplementation(() => {
+      jest.spyOn(JsonFile, 'saveAsync').mockImplementation(async () => {
         /* no-op*/
         return true;
       });