fix: Allow empty (default) consumer group names

Author: HofmeisterAn

src/Testcontainers.EventHubs/EventHubsServiceConfiguration.cs

@@ -66,7 +66,7 @@ public EventHubsServiceConfiguration WithEntity(string name, int partitionCount,
     {
         // Filter out the consumer group name `$default` because the `$default` group
         // is created automatically by the container image.
-        var validConsumerGroupNames = consumerGroupNames.Where(consumerGroupName => !"$default".Equals(consumerGroupName, StringComparison.OrdinalIgnoreCase)).ToList();
+        var validConsumerGroupNames = consumerGroupNames.Where(consumerGroupName => !"$Default".Equals(consumerGroupName, StringComparison.OrdinalIgnoreCase)).ToList();
         return WithEntity(name, partitionCount, new ReadOnlyCollection<string>(validConsumerGroupNames));
     }
 
@@ -82,7 +82,7 @@ public bool Validate()
     {
         // The emulator provides the usage quotas as described at:
         // https://learn.microsoft.com/en-us/azure/event-hubs/overview-emulator#usage-quotas.
-        Predicate<Entity> isValidEntity = entity => entity.PartitionCount > 0 && entity.PartitionCount <= 32 && entity.ConsumerGroups.Count > 0 && entity.ConsumerGroups.Count <= 20;
+        Predicate<Entity> isValidEntity = entity => entity.PartitionCount > 0 && entity.PartitionCount <= 32 && entity.ConsumerGroups.Count <= 20;
         return _namespaceConfig.Entities.Count > 0 && _namespaceConfig.Entities.Count <= 10 && _namespaceConfig.Entities.All(entity => isValidEntity(entity));
     }
 

tests/Testcontainers.EventHubs.Tests/EventHubsContainerTest.cs

@@ -26,7 +26,7 @@ public Task DisposeAsync()
 
     private static EventHubsServiceConfiguration GetServiceConfiguration()
     {
-        return EventHubsServiceConfiguration.Create().WithEntity(EventHubsName, 2, [EventHubConsumerClient.DefaultConsumerGroupName, EventHubsConsumerGroupName]);
+        return EventHubsServiceConfiguration.Create().WithEntity(EventHubsName, 2, EventHubConsumerClient.DefaultConsumerGroupName, EventHubsConsumerGroupName);
     }
 
     [Fact]