[PM-13322] [BEEEP] Add PolicyValidators and refactor policy save logic (#4877)

test/Common/AutoFixture/SutProviderExtensions.cs

@@ -1,6 +1,7 @@
 using AutoFixture;
 using Bit.Core.Services;
 using Bit.Core.Settings;
+using Microsoft.Extensions.Time.Testing;
 using NSubstitute;
 using RichardSzalay.MockHttp;
 
@@ -47,4 +48,19 @@ public static class SutProviderExtensions
             .SetDependency(mockHttpClientFactory)
             .Create();
     }
+
+    /// <summary>
+    /// Configures SutProvider to use FakeTimeProvider.
+    /// It is registered under both the TimeProvider type and the FakeTimeProvider type
+    /// so that it can be retrieved in a type-safe manner with GetDependency.
+    /// This can be chained with other builder methods; make sure to call
+    /// <see cref="ISutProvider.Create"/> before use.
+    /// </summary>
+    public static SutProvider<T> WithFakeTimeProvider<T>(this SutProvider<T> sutProvider)
+    {
+        var fakeTimeProvider = new FakeTimeProvider();
+        return sutProvider
+            .SetDependency((TimeProvider)fakeTimeProvider)
+            .SetDependency(fakeTimeProvider);
+    }
 }