Updated scanner to infer when it has reached the end of results.

JSMR.Tests/Integrations/DLSite/DLSiteClientTests.cs

@@ -5,6 +5,7 @@ using JSMR.Infrastructure.Http;
 using JSMR.Infrastructure.Integrations.DLSite;
 using JSMR.Infrastructure.Integrations.DLSite.Mapping;
 using JSMR.Infrastructure.Integrations.DLSite.Models;
+using JSMR.Tests.Extensions;
 using JSMR.Tests.Utilities;
 using Microsoft.Extensions.Logging;
 using NSubstitute;
@@ -25,9 +26,7 @@ public class DLSiteClientTests
         string productInfoJson = await ReadJsonResourceAsync("Product-Info.json");
 
         IHttpService httpService = Substitute.For<IHttpService>();
-
-        httpService.GetStringAsync(Arg.Any<string>(), CancellationToken.None)
-            .Returns(Task.FromResult(productInfoJson));
+        httpService.ReturnsContent(productInfoJson);
 
         var logger = Substitute.For<ILogger<DLSiteClient>>();
         var client = new DLSiteClient(httpService, logger);