2 files changed, 9 insertions, 2 deletions

diff --git a/src/burn/test/BurnUnitTest/CacheTest.cpp b/src/burn/test/BurnUnitTest/CacheTest.cpp
index 2bec05fe..8e3660b2 100644
--- a/src/burn/test/BurnUnitTest/CacheTest.cpp
+++ b/src/burn/test/BurnUnitTest/CacheTest.cpp
@@ -83,7 +83,7 @@ namespace Bootstrapper
                 CacheUninitialize(&cache);
 
                 // Second fallback is system-level %TMP%.
-                hr = RegWriteExpandString(hkSystemEnvironment, L"TMP", L"B:\\TEST\\TMP\\");
+                hr = RegWriteString(hkSystemEnvironment, L"TMP", L"B:\\TEST\\TMP\\");
                 NativeAssert::Succeeded(hr, "Failed to write TEMP system environment value.");
 
                 hr = CacheInitialize(&cache, &internalCommand);
diff --git a/src/test/burn/WixToolsetTest.BurnE2E/RegistrationTests.cs b/src/test/burn/WixToolsetTest.BurnE2E/RegistrationTests.cs
index d9eb36ba..65d0c9cd 100644
--- a/src/test/burn/WixToolsetTest.BurnE2E/RegistrationTests.cs
+++ b/src/test/burn/WixToolsetTest.BurnE2E/RegistrationTests.cs
@@ -15,6 +15,7 @@ namespace WixToolsetTest.BurnE2E
         [RuntimeFact]
         public void AllowsBAToKeepRegistration()
         {
+            const string fakeInstallDay = "20230101";
             this.CreatePackageInstaller("PackageA");
             var bundleA = this.CreateBundleInstaller("BundleA");
             var testBAController = this.CreateTestBAController();
@@ -35,6 +36,12 @@ namespace WixToolsetTest.BurnE2E
             testBAController.SetForceKeepRegistration(null);
             testBAController.ResetPackageStates("PackageA");
 
+            // Pretend the bundle was installed on this day to be able to verify that it is only written on the initial install.
+            using (var registrationKey = initialRegistration.BaseKey.OpenSubKey(initialRegistration.KeyPath, writable: true))
+            {
+                registrationKey.SetValue(GenericArpRegistration.REGISTRY_ARP_INSTALL_DATE, fakeInstallDay);
+            }
+
             bundleA.Install();
             var finalRegistration = bundleA.VerifyRegisteredAndInPackageCache();
 
@@ -42,7 +49,7 @@ namespace WixToolsetTest.BurnE2E
             Assert.NotNull(finalRegistration.EstimatedSize);
             Assert.InRange(finalRegistration.EstimatedSize.Value, initialRegistration.EstimatedSize.Value + 1, Int32.MaxValue);
 
-            Assert.Equal(initialRegistration.InstallDate, finalRegistration.InstallDate);
+            Assert.Equal(fakeInstallDay, finalRegistration.InstallDate);
         }
 
         [RuntimeFact]