Add a test condition for skipping tests when the default keychain is missing for macOS

test/Microsoft.AspNetCore.DataProtection.Extensions.Test/DataProtectionProviderTests.cs

@@ -115,7 +115,8 @@ namespace Microsoft.AspNetCore.DataProtection
             });
         }
 
-        [Fact]
+        [ConditionalFact]
+        [X509StoreIsAvailable(StoreName.My, StoreLocation.CurrentUser)]
         public void System_UsesProvidedDirectoryAndCertificate()
         {
             var filePath = Path.Combine(GetTestFilesPath(), "TestCert.pfx");
@@ -162,12 +163,7 @@ namespace Microsoft.AspNetCore.DataProtection
             var filePath = Path.Combine(GetTestFilesPath(), "TestCert2.pfx");
             var certificate = new X509Certificate2(filePath, "password");
 
-            using (var store = new X509Store(StoreName.My, StoreLocation.CurrentUser))
-            {
-                store.Open(OpenFlags.ReadOnly);
-                // ensure this cert is not in the x509 store
-                Assert.Empty(store.Certificates.Find(X509FindType.FindByThumbprint, certificate.Thumbprint, false));
-            }
+            AssetStoreDoesNotContain(certificate);
 
             WithUniqueTempDirectory(directory =>
             {
@@ -189,6 +185,24 @@ namespace Microsoft.AspNetCore.DataProtection
             });
         }
 
+        private static void AssetStoreDoesNotContain(X509Certificate2 certificate)
+        {
+            using (var store = new X509Store(StoreName.My, StoreLocation.CurrentUser))
+            {
+                try
+                {
+                    store.Open(OpenFlags.ReadOnly);
+                }
+                catch
+                {
+                    return;
+                }
+
+                // ensure this cert is not in the x509 store
+                Assert.Empty(store.Certificates.Find(X509FindType.FindByThumbprint, certificate.Thumbprint, false));
+            }
+        }
+
         [Fact]
         public void System_CanUnprotectWithCert()
         {

test/Microsoft.AspNetCore.DataProtection.Extensions.Test/X509StoreIsAvailableAttribute.cs

@@ -0,0 +1,43 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
+using System.Security.Cryptography.X509Certificates;
+using Microsoft.AspNetCore.Testing.xunit;
+
+namespace Microsoft.AspNetCore.DataProtection
+{
+    [AttributeUsage(AttributeTargets.Method)]
+    public class X509StoreIsAvailableAttribute : Attribute, ITestCondition
+    {
+        public X509StoreIsAvailableAttribute(StoreName name, StoreLocation location)
+        {
+            Name = name;
+            Location = location;
+        }
+
+        public bool IsMet
+        {
+            get
+            {
+                try
+                {
+                    using (var store = new X509Store(Name, Location))
+                    {
+                        store.Open(OpenFlags.ReadWrite);
+                        return true;
+                    }
+                }
+                catch
+                {
+                    return false;
+                }
+            }
+        }
+
+        public string SkipReason => $"Skipping because the X509Store({Name}/{Location}) is not available on this machine.";
+
+        public StoreName Name { get; }
+        public StoreLocation Location { get; }
+    }
+}