From 9f2ecb5046b12a9b804d11211fefbf478217f483 Mon Sep 17 00:00:00 2001
From: "Julio C. Rocha" <julio.rocha@microsoft.com>
Date: Thu, 4 Jun 2026 19:58:13 -0700
Subject: [PATCH 1/3] Upgrade to GoogleTest adapter 1.8.1.8

---
 .../Microsoft.ReactNative.Cxx.UnitTests.vcxproj             | 2 +-
 .../Microsoft.ReactNative.Cxx.UnitTests/packages.lock.json  | 6 +++---
 .../Microsoft.ReactNative.IntegrationTests.vcxproj          | 2 +-
 .../packages.lock.json                                      | 6 +++---
 vnext/Mso.UnitTests/Mso.UnitTests.vcxproj                   | 2 +-
 vnext/Mso.UnitTests/packages.lock.json                      | 6 +++---
 vnext/PropertySheets/React.Cpp.props                        | 4 ++--
 vnext/ReactCommon.UnitTests/ReactCommon.UnitTests.vcxproj   | 2 +-
 8 files changed, 15 insertions(+), 15 deletions(-)

diff --git a/vnext/Microsoft.ReactNative.Cxx.UnitTests/Microsoft.ReactNative.Cxx.UnitTests.vcxproj b/vnext/Microsoft.ReactNative.Cxx.UnitTests/Microsoft.ReactNative.Cxx.UnitTests.vcxproj
index 63f176b1173..455cb5aca32 100644
--- a/vnext/Microsoft.ReactNative.Cxx.UnitTests/Microsoft.ReactNative.Cxx.UnitTests.vcxproj
+++ b/vnext/Microsoft.ReactNative.Cxx.UnitTests/Microsoft.ReactNative.Cxx.UnitTests.vcxproj
@@ -162,7 +162,7 @@
   <ItemGroup>
     <PackageReference Include="$(WinUIPackageName)" Version="$(WinUIPackageVersion)"
       Condition="'$(OverrideWinUIPackage)'!='true'" />
-    <PackageReference Include="Microsoft.googletest.v140.windesktop.msvcstl.static.rt-dyn" Version="1.8.1.7" />
+    <PackageReference Include="Microsoft.googletest.v140.windesktop.msvcstl.static.rt-dyn" Version="1.8.1.8" />
     <PackageReference Include="Microsoft.Windows.CppWinRT" Version="$(CppWinRTVersion)" PrivateAssets="all" />
     <PackageReference Include="$(V8PackageName)" Version="$(V8Version)" Condition="'$(UseV8)' == 'true'" />
   </ItemGroup>
diff --git a/vnext/Microsoft.ReactNative.Cxx.UnitTests/packages.lock.json b/vnext/Microsoft.ReactNative.Cxx.UnitTests/packages.lock.json
index 3077a54470f..236c8f35428 100644
--- a/vnext/Microsoft.ReactNative.Cxx.UnitTests/packages.lock.json
+++ b/vnext/Microsoft.ReactNative.Cxx.UnitTests/packages.lock.json
@@ -4,9 +4,9 @@
     "native,Version=v0.0": {
       "Microsoft.googletest.v140.windesktop.msvcstl.static.rt-dyn": {
         "type": "Direct",
-        "requested": "[1.8.1.7, )",
-        "resolved": "1.8.1.7",
-        "contentHash": "FxNwT4YpsGdqforqFSTGc5f/e+qfRJ+1wf5G1w0nEEkT5pr5M95E5+fOuswpPUGXPZIXM+M7BSVGnCRcQZjomA=="
+        "requested": "[1.8.1.8, )",
+        "resolved": "1.8.1.8",
+        "contentHash": "RHZUuFTnYzkHPRM5muZfw4SRL/EIHFz7nIkKl1mJKPISvzi1wWtK7k/oJIpw3pWVkdFyEfnBQP8vX1fFpe7Mpw=="
       },
       "Microsoft.Windows.CppWinRT": {
         "type": "Direct",
diff --git a/vnext/Microsoft.ReactNative.IntegrationTests/Microsoft.ReactNative.IntegrationTests.vcxproj b/vnext/Microsoft.ReactNative.IntegrationTests/Microsoft.ReactNative.IntegrationTests.vcxproj
index 81b39fcd7e9..405d35af50f 100644
--- a/vnext/Microsoft.ReactNative.IntegrationTests/Microsoft.ReactNative.IntegrationTests.vcxproj
+++ b/vnext/Microsoft.ReactNative.IntegrationTests/Microsoft.ReactNative.IntegrationTests.vcxproj
@@ -190,7 +190,7 @@
   <ItemGroup>
     <PackageReference Include="boost" Version="1.84.0.0" />
     <PackageReference Include="Microsoft.googletest.v140.windesktop.msvcstl.static.rt-dyn"
-      Version="1.8.1.7" />
+      Version="1.8.1.8" />
     <PackageReference Include="Microsoft.VCRTForwarders.140" Version="1.0.6" />
     <PackageReference Include="Microsoft.Windows.CppWinRT" Version="$(CppWinRTVersion)"
       PrivateAssets="all" />
diff --git a/vnext/Microsoft.ReactNative.IntegrationTests/packages.lock.json b/vnext/Microsoft.ReactNative.IntegrationTests/packages.lock.json
index 2fdfaa342b9..9db8908014c 100644
--- a/vnext/Microsoft.ReactNative.IntegrationTests/packages.lock.json
+++ b/vnext/Microsoft.ReactNative.IntegrationTests/packages.lock.json
@@ -10,9 +10,9 @@
       },
       "Microsoft.googletest.v140.windesktop.msvcstl.static.rt-dyn": {
         "type": "Direct",
-        "requested": "[1.8.1.7, )",
-        "resolved": "1.8.1.7",
-        "contentHash": "FxNwT4YpsGdqforqFSTGc5f/e+qfRJ+1wf5G1w0nEEkT5pr5M95E5+fOuswpPUGXPZIXM+M7BSVGnCRcQZjomA=="
+        "requested": "[1.8.1.8, )",
+        "resolved": "1.8.1.8",
+        "contentHash": "RHZUuFTnYzkHPRM5muZfw4SRL/EIHFz7nIkKl1mJKPISvzi1wWtK7k/oJIpw3pWVkdFyEfnBQP8vX1fFpe7Mpw=="
       },
       "Microsoft.VCRTForwarders.140": {
         "type": "Direct",
diff --git a/vnext/Mso.UnitTests/Mso.UnitTests.vcxproj b/vnext/Mso.UnitTests/Mso.UnitTests.vcxproj
index 1609c75d257..6d90cf64452 100644
--- a/vnext/Mso.UnitTests/Mso.UnitTests.vcxproj
+++ b/vnext/Mso.UnitTests/Mso.UnitTests.vcxproj
@@ -183,7 +183,7 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="Microsoft.googletest.v140.windesktop.msvcstl.static.rt-dyn"
-      Version="1.8.1.7" />
+      Version="1.8.1.8" />
     <PackageReference Include="Microsoft.Windows.CppWinRT" Version="$(CppWinRTVersion)"
       PrivateAssets="all" />
   </ItemGroup>
diff --git a/vnext/Mso.UnitTests/packages.lock.json b/vnext/Mso.UnitTests/packages.lock.json
index 3077a54470f..236c8f35428 100644
--- a/vnext/Mso.UnitTests/packages.lock.json
+++ b/vnext/Mso.UnitTests/packages.lock.json
@@ -4,9 +4,9 @@
     "native,Version=v0.0": {
       "Microsoft.googletest.v140.windesktop.msvcstl.static.rt-dyn": {
         "type": "Direct",
-        "requested": "[1.8.1.7, )",
-        "resolved": "1.8.1.7",
-        "contentHash": "FxNwT4YpsGdqforqFSTGc5f/e+qfRJ+1wf5G1w0nEEkT5pr5M95E5+fOuswpPUGXPZIXM+M7BSVGnCRcQZjomA=="
+        "requested": "[1.8.1.8, )",
+        "resolved": "1.8.1.8",
+        "contentHash": "RHZUuFTnYzkHPRM5muZfw4SRL/EIHFz7nIkKl1mJKPISvzi1wWtK7k/oJIpw3pWVkdFyEfnBQP8vX1fFpe7Mpw=="
       },
       "Microsoft.Windows.CppWinRT": {
         "type": "Direct",
diff --git a/vnext/PropertySheets/React.Cpp.props b/vnext/PropertySheets/React.Cpp.props
index edabc4a699e..72678551e22 100644
--- a/vnext/PropertySheets/React.Cpp.props
+++ b/vnext/PropertySheets/React.Cpp.props
@@ -43,8 +43,8 @@
 
   <PropertyGroup Label="ExternalDependencies">
     <!-- Google Test Adapter -->
-    <!-- Property sheets in the adapter's NuGet doesn't consider PlatformToolset=v143 -->
-    <Force-Enable-Microsoft-googletest-v140-windesktop-msvcstl-static-rt-dyn>false</Force-Enable-Microsoft-googletest-v140-windesktop-msvcstl-static-rt-dyn>
+    <!-- If ApplicationType is set, adapter include paths won't be set for MSVC 14.0 (v140) or later -->
+    <Force-Enable-Microsoft-googletest-v140-windesktop-msvcstl-static-rt-dyn>true</Force-Enable-Microsoft-googletest-v140-windesktop-msvcstl-static-rt-dyn>
   </PropertyGroup>
 
   <!--
diff --git a/vnext/ReactCommon.UnitTests/ReactCommon.UnitTests.vcxproj b/vnext/ReactCommon.UnitTests/ReactCommon.UnitTests.vcxproj
index 353a7e1bc20..34e077a5675 100644
--- a/vnext/ReactCommon.UnitTests/ReactCommon.UnitTests.vcxproj
+++ b/vnext/ReactCommon.UnitTests/ReactCommon.UnitTests.vcxproj
@@ -181,7 +181,7 @@
   </ItemDefinitionGroup>
   <ItemGroup>
     <PackageReference Include="boost" Version="1.84.0.0" />
-    <PackageReference Include="Microsoft.googletest.v140.windesktop.msvcstl.static.rt-dyn" Version="1.8.1.7" />
+    <PackageReference Include="Microsoft.googletest.v140.windesktop.msvcstl.static.rt-dyn" Version="1.8.1.8" />
     <PackageReference Include="$(V8PackageName)" Version="$(V8Version)" Condition="'$(UseV8)' == 'true'" />
   </ItemGroup>
 </Project>
\ No newline at end of file

From d4e84013915da0a61570f5ff612a587e7ca3728d Mon Sep 17 00:00:00 2001
From: "Julio C. Rocha" <julio.rocha@microsoft.com>
Date: Thu, 4 Jun 2026 20:04:34 -0700
Subject: [PATCH 2/3] Change files

---
 ...ative-windows-f8f860c1-f597-4280-aaf2-f3250f196760.json | 7 +++++++
 1 file changed, 7 insertions(+)
 create mode 100644 change/react-native-windows-f8f860c1-f597-4280-aaf2-f3250f196760.json

diff --git a/change/react-native-windows-f8f860c1-f597-4280-aaf2-f3250f196760.json b/change/react-native-windows-f8f860c1-f597-4280-aaf2-f3250f196760.json
new file mode 100644
index 00000000000..ee31db063aa
--- /dev/null
+++ b/change/react-native-windows-f8f860c1-f597-4280-aaf2-f3250f196760.json
@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "Upgrade to GoogleTest adapter 1.8.1.8",
+  "packageName": "react-native-windows",
+  "email": "julio.rocha@microsoft.com",
+  "dependentChangeType": "patch"
+}

From 996fd52727396f03dbeaf117a9a50b8309b3121a Mon Sep 17 00:00:00 2001
From: Julio Cesar Rocha <julio.rocha@microsoft.com>
Date: Thu, 4 Jun 2026 22:54:33 -0700
Subject: [PATCH 3/3] Update package lock files

---
 .../packages.experimentalwinui3.lock.json                   | 6 +++---
 .../packages.experimentalwinui3.lock.json                   | 6 +++---
 vnext/Mso.UnitTests/packages.experimentalwinui3.lock.json   | 6 +++---
 .../packages.experimentalwinui3.lock.json                   | 6 +++---
 vnext/ReactCommon.UnitTests/packages.lock.json              | 6 +++---
 5 files changed, 15 insertions(+), 15 deletions(-)

diff --git a/vnext/Microsoft.ReactNative.Cxx.UnitTests/packages.experimentalwinui3.lock.json b/vnext/Microsoft.ReactNative.Cxx.UnitTests/packages.experimentalwinui3.lock.json
index 37e573dcf94..abb0152cdb0 100644
--- a/vnext/Microsoft.ReactNative.Cxx.UnitTests/packages.experimentalwinui3.lock.json
+++ b/vnext/Microsoft.ReactNative.Cxx.UnitTests/packages.experimentalwinui3.lock.json
@@ -4,9 +4,9 @@
     "native,Version=v0.0": {
       "Microsoft.googletest.v140.windesktop.msvcstl.static.rt-dyn": {
         "type": "Direct",
-        "requested": "[1.8.1.7, )",
-        "resolved": "1.8.1.7",
-        "contentHash": "FxNwT4YpsGdqforqFSTGc5f/e+qfRJ+1wf5G1w0nEEkT5pr5M95E5+fOuswpPUGXPZIXM+M7BSVGnCRcQZjomA=="
+        "requested": "[1.8.1.8, )",
+        "resolved": "1.8.1.8",
+        "contentHash": "RHZUuFTnYzkHPRM5muZfw4SRL/EIHFz7nIkKl1mJKPISvzi1wWtK7k/oJIpw3pWVkdFyEfnBQP8vX1fFpe7Mpw=="
       },
       "Microsoft.Windows.CppWinRT": {
         "type": "Direct",
diff --git a/vnext/Microsoft.ReactNative.IntegrationTests/packages.experimentalwinui3.lock.json b/vnext/Microsoft.ReactNative.IntegrationTests/packages.experimentalwinui3.lock.json
index 56bd245b545..37a59d5dff2 100644
--- a/vnext/Microsoft.ReactNative.IntegrationTests/packages.experimentalwinui3.lock.json
+++ b/vnext/Microsoft.ReactNative.IntegrationTests/packages.experimentalwinui3.lock.json
@@ -10,9 +10,9 @@
       },
       "Microsoft.googletest.v140.windesktop.msvcstl.static.rt-dyn": {
         "type": "Direct",
-        "requested": "[1.8.1.7, )",
-        "resolved": "1.8.1.7",
-        "contentHash": "FxNwT4YpsGdqforqFSTGc5f/e+qfRJ+1wf5G1w0nEEkT5pr5M95E5+fOuswpPUGXPZIXM+M7BSVGnCRcQZjomA=="
+        "requested": "[1.8.1.8, )",
+        "resolved": "1.8.1.8",
+        "contentHash": "RHZUuFTnYzkHPRM5muZfw4SRL/EIHFz7nIkKl1mJKPISvzi1wWtK7k/oJIpw3pWVkdFyEfnBQP8vX1fFpe7Mpw=="
       },
       "Microsoft.VCRTForwarders.140": {
         "type": "Direct",
diff --git a/vnext/Mso.UnitTests/packages.experimentalwinui3.lock.json b/vnext/Mso.UnitTests/packages.experimentalwinui3.lock.json
index 37e573dcf94..abb0152cdb0 100644
--- a/vnext/Mso.UnitTests/packages.experimentalwinui3.lock.json
+++ b/vnext/Mso.UnitTests/packages.experimentalwinui3.lock.json
@@ -4,9 +4,9 @@
     "native,Version=v0.0": {
       "Microsoft.googletest.v140.windesktop.msvcstl.static.rt-dyn": {
         "type": "Direct",
-        "requested": "[1.8.1.7, )",
-        "resolved": "1.8.1.7",
-        "contentHash": "FxNwT4YpsGdqforqFSTGc5f/e+qfRJ+1wf5G1w0nEEkT5pr5M95E5+fOuswpPUGXPZIXM+M7BSVGnCRcQZjomA=="
+        "requested": "[1.8.1.8, )",
+        "resolved": "1.8.1.8",
+        "contentHash": "RHZUuFTnYzkHPRM5muZfw4SRL/EIHFz7nIkKl1mJKPISvzi1wWtK7k/oJIpw3pWVkdFyEfnBQP8vX1fFpe7Mpw=="
       },
       "Microsoft.Windows.CppWinRT": {
         "type": "Direct",
diff --git a/vnext/ReactCommon.UnitTests/packages.experimentalwinui3.lock.json b/vnext/ReactCommon.UnitTests/packages.experimentalwinui3.lock.json
index 61bdcb54625..d4687ff9f47 100644
--- a/vnext/ReactCommon.UnitTests/packages.experimentalwinui3.lock.json
+++ b/vnext/ReactCommon.UnitTests/packages.experimentalwinui3.lock.json
@@ -10,9 +10,9 @@
       },
       "Microsoft.googletest.v140.windesktop.msvcstl.static.rt-dyn": {
         "type": "Direct",
-        "requested": "[1.8.1.7, )",
-        "resolved": "1.8.1.7",
-        "contentHash": "FxNwT4YpsGdqforqFSTGc5f/e+qfRJ+1wf5G1w0nEEkT5pr5M95E5+fOuswpPUGXPZIXM+M7BSVGnCRcQZjomA=="
+        "requested": "[1.8.1.8, )",
+        "resolved": "1.8.1.8",
+        "contentHash": "RHZUuFTnYzkHPRM5muZfw4SRL/EIHFz7nIkKl1mJKPISvzi1wWtK7k/oJIpw3pWVkdFyEfnBQP8vX1fFpe7Mpw=="
       },
       "ReactNative.V8Jsi.Windows": {
         "type": "Direct",
diff --git a/vnext/ReactCommon.UnitTests/packages.lock.json b/vnext/ReactCommon.UnitTests/packages.lock.json
index fa7355e4e2c..2c1f200cb87 100644
--- a/vnext/ReactCommon.UnitTests/packages.lock.json
+++ b/vnext/ReactCommon.UnitTests/packages.lock.json
@@ -10,9 +10,9 @@
       },
       "Microsoft.googletest.v140.windesktop.msvcstl.static.rt-dyn": {
         "type": "Direct",
-        "requested": "[1.8.1.7, )",
-        "resolved": "1.8.1.7",
-        "contentHash": "FxNwT4YpsGdqforqFSTGc5f/e+qfRJ+1wf5G1w0nEEkT5pr5M95E5+fOuswpPUGXPZIXM+M7BSVGnCRcQZjomA=="
+        "requested": "[1.8.1.8, )",
+        "resolved": "1.8.1.8",
+        "contentHash": "RHZUuFTnYzkHPRM5muZfw4SRL/EIHFz7nIkKl1mJKPISvzi1wWtK7k/oJIpw3pWVkdFyEfnBQP8vX1fFpe7Mpw=="
       },
       "ReactNative.V8Jsi.Windows": {
         "type": "Direct",