Adding Unit Test

src/Microsoft.Bcl.HashCode/tests/Configurations.props

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+<Project DefaultTargets="Build">
+  <PropertyGroup>
+    <BuildConfigurations>
+      netfx;
+    </BuildConfigurations>
+  </PropertyGroup>
+</Project>

src/Microsoft.Bcl.HashCode/tests/HashCodeSeedInitializerTests.cs

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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using Microsoft.DotNet.RemoteExecutor;
+using System;
+using System.Reflection;
+using Xunit;
+
+namespace Microsoft.Bcl.HashCode.Tests
+{
+    public class HashCodeSeedInitializerTests
+    {
+        [Fact]
+        public void EnsureSeedReturnsDifferentValuesTest()
+        {
+            var executor1 = RemoteExecutor.Invoke(GetHashCodeSeed, new RemoteInvokeOptions() { CheckExitCode = false });
+
+            int FirstSeed = executor1.ExitCode;
+            executor1.Dispose();
+
+            var executor2 = RemoteExecutor.Invoke(GetHashCodeSeed, new RemoteInvokeOptions() { CheckExitCode = false });
+
+            int SecondSeed = executor2.ExitCode;
+            executor2.Dispose();
+
+            Assert.NotEqual(FirstSeed, SecondSeed);
+
+            int GetHashCodeSeed()
+            {
+                var seed1Field = typeof(System.HashCode).GetField("s_seed", BindingFlags.NonPublic | BindingFlags.Static);
+                int returnCode = (int)((uint)seed1Field.GetValue(null));
+                return returnCode;
+            };
+        }
+
+    }
+
+}

src/Microsoft.Bcl.HashCode/tests/Microsoft.Bcl.HashCode.Tests.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <Configurations>netfx-Debug;netfx-Release</Configurations>
+    <IncludeRemoteExecutor>true</IncludeRemoteExecutor>
+  </PropertyGroup>
+  <ItemGroup>
+    <Compile Include="HashCodeSeedInitializerTests.cs" />
+  </ItemGroup>
+</Project>