Test: build failure should abort the job and report Red

Author: bart-vmware

src/Discovery/test/Eureka.Test/PostConfigureEurekaInstanceOptionsTest.cs

@@ -329,7 +329,7 @@ public async Task Adds_random_number_to_instance_ID_when_ports_are_zero()
         EurekaInstanceOptions instanceOptions = optionsMonitor.CurrentValue;
 
         instanceOptions.InstanceId.Should().NotBeNull();
-        string[] parts = instanceOptions.InstanceId.Split(':');
+        string[] parts = instanceOptions.InstanceId!.Split(':');
         parts.Should().HaveCount(3);
 
         int.TryParse(parts[2], CultureInfo.InvariantCulture, out int number).Should().BeTrue();