From 115ef11b3bda5ca8008670c933cee309ec696025 Mon Sep 17 00:00:00 2001
From: Jose Perez Rodriguez <joperezr@microsoft.com>
Date: Tue, 10 Nov 2020 20:58:01 -0800
Subject: [PATCH] Adding Unit Test

---
 .../tests/Configurations.props                |  7 ++++
 .../tests/HashCodeSeedInitializerTests.cs     | 39 +++++++++++++++++++
 .../tests/Microsoft.Bcl.HashCode.Tests.csproj |  9 +++++
 3 files changed, 55 insertions(+)
 create mode 100644 src/Microsoft.Bcl.HashCode/tests/Configurations.props
 create mode 100644 src/Microsoft.Bcl.HashCode/tests/HashCodeSeedInitializerTests.cs
 create mode 100644 src/Microsoft.Bcl.HashCode/tests/Microsoft.Bcl.HashCode.Tests.csproj

diff --git a/src/Microsoft.Bcl.HashCode/tests/Configurations.props b/src/Microsoft.Bcl.HashCode/tests/Configurations.props
new file mode 100644
index 000000000000..c4ab5ac7ca7b
--- /dev/null
+++ b/src/Microsoft.Bcl.HashCode/tests/Configurations.props
@@ -0,0 +1,7 @@
+<Project DefaultTargets="Build">
+  <PropertyGroup>
+    <BuildConfigurations>
+      netfx;
+    </BuildConfigurations>
+  </PropertyGroup>
+</Project>
diff --git a/src/Microsoft.Bcl.HashCode/tests/HashCodeSeedInitializerTests.cs b/src/Microsoft.Bcl.HashCode/tests/HashCodeSeedInitializerTests.cs
new file mode 100644
index 000000000000..d9e5f32cab72
--- /dev/null
+++ b/src/Microsoft.Bcl.HashCode/tests/HashCodeSeedInitializerTests.cs
@@ -0,0 +1,39 @@
+// 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;
+            };
+        }
+
+    }
+
+}
diff --git a/src/Microsoft.Bcl.HashCode/tests/Microsoft.Bcl.HashCode.Tests.csproj b/src/Microsoft.Bcl.HashCode/tests/Microsoft.Bcl.HashCode.Tests.csproj
new file mode 100644
index 000000000000..3149bc7bc997
--- /dev/null
+++ b/src/Microsoft.Bcl.HashCode/tests/Microsoft.Bcl.HashCode.Tests.csproj
@@ -0,0 +1,9 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <Configurations>netfx-Debug;netfx-Release</Configurations>
+    <IncludeRemoteExecutor>true</IncludeRemoteExecutor>
+  </PropertyGroup>
+  <ItemGroup>
+    <Compile Include="HashCodeSeedInitializerTests.cs" />
+  </ItemGroup>
+</Project>