diff --git a/src/libraries/System.Diagnostics.DiagnosticSource/tests/TestWithConfigSwitches/System.Diagnostics.DiagnosticSource.Switches.Tests.csproj b/src/libraries/System.Diagnostics.DiagnosticSource/tests/TestWithConfigSwitches/System.Diagnostics.DiagnosticSource.Switches.Tests.csproj
index e9dd8a7adec52..90a660f236118 100644
--- a/src/libraries/System.Diagnostics.DiagnosticSource/tests/TestWithConfigSwitches/System.Diagnostics.DiagnosticSource.Switches.Tests.csproj
+++ b/src/libraries/System.Diagnostics.DiagnosticSource/tests/TestWithConfigSwitches/System.Diagnostics.DiagnosticSource.Switches.Tests.csproj
@@ -3,6 +3,9 @@
     <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
     <TestRuntime>true</TestRuntime>
   </PropertyGroup>
+  <ItemGroup>
+    <RuntimeHostConfigurationOption Include="System.Diagnostics.DefaultActivityIdFormatIsHierarchial" Value="true" />
+  </ItemGroup>
   <ItemGroup>
     <Compile Include="ActivityTests.cs" />
   </ItemGroup>
diff --git a/src/libraries/System.Diagnostics.DiagnosticSource/tests/TestWithConfigSwitches/runtimeconfig.template.json b/src/libraries/System.Diagnostics.DiagnosticSource/tests/TestWithConfigSwitches/runtimeconfig.template.json
deleted file mode 100644
index 1b600a96bff58..0000000000000
--- a/src/libraries/System.Diagnostics.DiagnosticSource/tests/TestWithConfigSwitches/runtimeconfig.template.json
+++ /dev/null
@@ -1,5 +0,0 @@
-{
-  "configProperties": {
-    "System.Diagnostics.DefaultActivityIdFormatIsHierarchial": true
-  }
-}
\ No newline at end of file
diff --git a/src/libraries/System.Globalization.Extensions/tests/NlsTests/System.Globalization.Extensions.Nls.Tests.csproj b/src/libraries/System.Globalization.Extensions/tests/NlsTests/System.Globalization.Extensions.Nls.Tests.csproj
index 573565c9decac..61a409ffedc32 100644
--- a/src/libraries/System.Globalization.Extensions/tests/NlsTests/System.Globalization.Extensions.Nls.Tests.csproj
+++ b/src/libraries/System.Globalization.Extensions/tests/NlsTests/System.Globalization.Extensions.Nls.Tests.csproj
@@ -3,6 +3,9 @@
     <TargetFramework>$(NetCoreAppCurrent)-windows</TargetFramework>
     <TestRuntime>true</TestRuntime>
   </PropertyGroup>
+  <ItemGroup>
+    <RuntimeHostConfigurationOption Include="System.Globalization.UseNls" Value="true" />
+  </ItemGroup>
   <ItemGroup>
     <Compile Include="..\GetStringComparerTests.cs"
              Link="GetStringComparerTests.cs" />
diff --git a/src/libraries/System.Globalization.Extensions/tests/NlsTests/runtimeconfig.template.json b/src/libraries/System.Globalization.Extensions/tests/NlsTests/runtimeconfig.template.json
deleted file mode 100644
index ec1e96166f3b3..0000000000000
--- a/src/libraries/System.Globalization.Extensions/tests/NlsTests/runtimeconfig.template.json
+++ /dev/null
@@ -1,5 +0,0 @@
-{
-  "configProperties": {
-    "System.Globalization.UseNls": true
-  }
-}
diff --git a/src/libraries/System.Resources.ResourceManager/tests/runtimeconfig.template.json b/src/libraries/System.Resources.ResourceManager/tests/runtimeconfig.template.json
deleted file mode 100644
index e3ad204dd9e51..0000000000000
--- a/src/libraries/System.Resources.ResourceManager/tests/runtimeconfig.template.json
+++ /dev/null
@@ -1,5 +0,0 @@
-{
-    "configProperties": {
-        "System.Drawing.EnableUnixSupport": true
-    }
-}
\ No newline at end of file
diff --git a/src/libraries/System.Runtime/tests/NlsTests/System.Runtime.Nls.Tests.csproj b/src/libraries/System.Runtime/tests/NlsTests/System.Runtime.Nls.Tests.csproj
index b93223c66887c..849edc8cd5c2c 100644
--- a/src/libraries/System.Runtime/tests/NlsTests/System.Runtime.Nls.Tests.csproj
+++ b/src/libraries/System.Runtime/tests/NlsTests/System.Runtime.Nls.Tests.csproj
@@ -6,6 +6,9 @@
     <TargetFramework>$(NetCoreAppCurrent)-windows</TargetFramework>
     <NoWarn>$(NoWarn),SYSLIB0013</NoWarn>
   </PropertyGroup>
+  <ItemGroup>
+    <RuntimeHostConfigurationOption Include="System.Globalization.UseNls" Value="true" />
+  </ItemGroup>
   <ItemGroup>
     <Compile Include="..\Helpers.cs"
              Link="Helpers.cs" />
diff --git a/src/libraries/System.Runtime/tests/NlsTests/runtimeconfig.template.json b/src/libraries/System.Runtime/tests/NlsTests/runtimeconfig.template.json
deleted file mode 100644
index f93c6039127bd..0000000000000
--- a/src/libraries/System.Runtime/tests/NlsTests/runtimeconfig.template.json
+++ /dev/null
@@ -1,5 +0,0 @@
-{
-    "configProperties": {
-        "System.Globalization.UseNls": true
-    }
-}