Assert Visit method for each type of aggregation

Author: russcam

src/Tests/Aggregations/AggregationVisitorTests.cs

@@ -0,0 +1,31 @@
+using System.Linq;
+using System.Reflection;
+using FluentAssertions;
+using Nest;
+using Nest.Aggregations.Visitor;
+using Tests.Framework;
+
+namespace Tests.Aggregations
+{
+    public class AggregationVisitorTests
+    {
+		[U]
+		public void VisitMethodForEachTypeOfAggregation()
+		{
+			var aggregationTypes =
+				from t in typeof(IAggregation).Assembly().Types()
+				where typeof(IAggregation).IsAssignableFrom(t)
+				where t.IsInterface()
+				select t;
+
+			var visitorMethodParameters =
+				from m in typeof(IAggregationVisitor).GetTypeInfo().DeclaredMethods
+				where m.Name == "Visit"
+				let aggregationInterface = m.GetParameters().First().ParameterType
+				where aggregationInterface != typeof(IAggregationContainer)
+				select aggregationInterface;
+
+			visitorMethodParameters.Except(aggregationTypes).Should().BeEmpty();
+		}
+	}
+}