Introduce unit-tests for issues fixed in v8

src/Polly.Core.Tests/Issues/IssuesTests.CircuitBreakerStateSharing_959.cs

@@ -0,0 +1,43 @@
+using Polly.CircuitBreaker;
+
+namespace Polly.Core.Tests.Issues;
+
+public partial class IssuesTests
+{
+    [Fact]
+    public void CircuitBreakerStateSharing_959()
+    {
+        var options = new AdvancedCircuitBreakerStrategyOptions
+        {
+            FailureThreshold = 1,
+            MinimumThroughput = 10
+        };
+
+        // handle int results
+        options.ShouldHandle.HandleResult(-1);
+
+        // handle string results
+        options.ShouldHandle.HandleResult("error");
+
+        // create the strategy
+        var strategy = new ResilienceStrategyBuilder { TimeProvider = TimeProvider.Object }.AddAdvancedCircuitBreaker(options).Build();
+
+        // now trigger the circuit breaker by evaluating multiple result types
+        for (int i = 0; i < 5; i++)
+        {
+            strategy.Execute(_ => -1);
+            strategy.Execute(_ => "error");
+        }
+
+        // now the circuit breaker should be open
+        strategy.Invoking(s => s.Execute(_ => 0)).Should().Throw<BrokenCircuitException>();
+        strategy.Invoking(s => s.Execute(_ => "valid-result")).Should().Throw<BrokenCircuitException>();
+
+        // now wait
+        TimeProvider.AdvanceTime(options.BreakDuration);
+
+        // OK, circuit is open now
+        strategy.Execute(_ => 0);
+        strategy.Execute(_ => "valid-result");
+    }
+}

src/Polly.Core.Tests/Issues/IssuesTests.cs

@@ -0,0 +1,6 @@
+namespace Polly.Core.Tests.Issues;
+
+public partial class IssuesTests
+{
+    private FakeTimeProvider TimeProvider { get; } = new FakeTimeProvider().SetupUtcNow();
+}