Update test deps

Rx.NET/Source/src/Microsoft.Reactive.Testing/Microsoft.Reactive.Testing.csproj

@@ -11,7 +11,7 @@
 
   <ItemGroup>
     <EmbeddedResource Include="Properties\*.xml" />
-    <PackageReference Include="xunit.assert.source" Version="2.3.1" PrivateAssets="All" /> 
+    <PackageReference Include="xunit.assert.source" Version="2.4.1" PrivateAssets="All" /> 
     <ProjectReference Include="..\System.Reactive\System.Reactive.csproj" />
   </ItemGroup>
 </Project>

Rx.NET/Source/tests/Tests.System.Reactive.ApiApprovals/Tests.System.Reactive.ApiApprovals.csproj

@@ -21,9 +21,9 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.8.0-preview-20180610-02" />
-    <PackageReference Include="xunit" Version="2.4.0-beta.2.build4010" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.0-beta.2.build4010" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.0.0-preview-20190203-03" />
+    <PackageReference Include="xunit" Version="2.4.1" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.1" />
     <PackageReference Include="ApprovalTests" Version="3.0.14" />
     <PackageReference Include="DiffPlex" Version="1.4.1" />
     <PackageReference Include="PublicApiGenerator" Version="7.0.1" />

Rx.NET/Source/tests/Tests.System.Reactive.Uwp.DeviceRunner/Tests.System.Reactive.Uwp.DeviceRunner.csproj

@@ -90,9 +90,9 @@
     <UseDotNetNativeToolchain>true</UseDotNetNativeToolchain>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="Microsoft.NETCore.UniversalWindowsPlatform" Version="6.1.5" />
-    <PackageReference Include="xunit" Version="2.4.0-beta.2.build4010" />
-    <PackageReference Include="xunit.runner.devices" Version="2.4.0-build.27" />
+    <PackageReference Include="Microsoft.NETCore.UniversalWindowsPlatform" Version="6.1.9" />
+    <PackageReference Include="xunit" Version="2.4.1" />
+    <PackageReference Include="xunit.runner.devices" Version="2.5.25" />
   </ItemGroup>
   <ItemGroup>
     <!-- A reference to the entire .Net Framework and Windows SDK are automatically included -->

Rx.NET/Source/tests/Tests.System.Reactive/Tests.System.Reactive.csproj

@@ -15,9 +15,9 @@
     <Reference Include="WindowsBase" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.8.0-preview-20180610-02" />    
-    <PackageReference Include="xunit" Version="2.4.0-beta.2.build4010" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.0-beta.2.build4010" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.0.0-preview-20190203-03" />    
+    <PackageReference Include="xunit" Version="2.4.1" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.1" />
     <ProjectReference Include="..\..\src\System.Reactive\System.Reactive.csproj" />
     <ProjectReference Include="..\..\src\System.Reactive.Observable.Aliases\System.Reactive.Observable.Aliases.csproj" />
     <ProjectReference Include="..\..\src\Microsoft.Reactive.Testing\Microsoft.Reactive.Testing.csproj" />