Add json tests for scroll and clear scroll

Author: gmarz

src/Tests/Search/Scroll/ClearScroll/ClearScrollApiTests.cs

@@ -22,10 +22,20 @@ protected override LazyResponses ClientUsage() => Calls(
 			requestAsync: (c, r) => c.ClearScrollAsync(r)
 		);
 
+		protected override object ExpectJson => new
+		{
+			scroll_id = new []
+			{
+				_scrollId
+			}
+		};
+
 		protected override int ExpectStatusCode => 200;
 		protected override bool ExpectIsValid => true;
 		protected override HttpMethod HttpMethod => HttpMethod.DELETE;
 		protected override string UrlPath => $"/_search/scroll";
+		protected override bool SupportsDeserialization => false;
+		
 
 		protected override ClearScrollDescriptor NewDescriptor() => new ClearScrollDescriptor();
 

src/Tests/Search/Scroll/Scroll/ScrollApiTests.cs

@@ -22,14 +22,19 @@ protected override LazyResponses ClientUsage() => Calls(
 			requestAsync: (c, r) => c.ScrollAsync<Project>(r)
 		);
 
+		protected override object ExpectJson => new
+		{
+			scroll = "1m",
+			scroll_id = _scrollId
+		};
+		
 		protected override int ExpectStatusCode => 200;
 		protected override bool ExpectIsValid => true;
 		protected override HttpMethod HttpMethod => HttpMethod.POST;
 		protected override string UrlPath => $"/_search/scroll";
+		protected override bool SupportsDeserialization => false;
 
-		protected override ScrollDescriptor<Project> NewDescriptor() => new ScrollDescriptor<Project>();
-
-		protected override Func<ScrollDescriptor<Project>, IScrollRequest> Fluent => null;
+		protected override Func<ScrollDescriptor<Project>, IScrollRequest> Fluent => s => s.Scroll("1m").ScrollId(_scrollId);
 
 		protected override ScrollRequest Initializer => new ScrollRequest(_scrollId, "1m");