fix(cluster-infrastructure): resolve ClusterInfrastructure-002..006 — options validation, DI registration, down-if-alone

tests/ScadaLink.ClusterInfrastructure.Tests/ClusterOptionsTests.cs

@@ -15,6 +15,15 @@ public class ClusterOptionsTests
         Assert.Equal(TimeSpan.FromSeconds(2), options.HeartbeatInterval);
         Assert.Equal(TimeSpan.FromSeconds(10), options.FailureDetectionThreshold);
         Assert.Equal(1, options.MinNrOfMembers);
+        Assert.True(options.DownIfAlone);
+    }
+
+    [Fact]
+    public void DownIfAlone_CanBeSet()
+    {
+        var options = new ClusterOptions { DownIfAlone = false };
+
+        Assert.False(options.DownIfAlone);
     }
 
     [Fact]