Make the tests pass

NuKeeper.Tests/Nuget/Api/ApiPackageLookupTests.cs

@@ -30,7 +30,6 @@ public async Task WellKnownPackageName_ShouldReturnResult()
             Assert.That(package.Identity.Id, Is.EqualTo("Newtonsoft.Json"));
         }
 
-
         [Test]
         public async Task AmbigousPackageName_ShouldReturnCorrectResult()
         {

NuKeeper/NuGet/Api/ApiPackageLookup.cs

@@ -3,6 +3,7 @@
 using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
+using NuGet.Common;
 using NuGet.Configuration;
 using NuGet.Protocol;
 using NuGet.Protocol.Core.Types;
@@ -11,18 +12,21 @@ namespace NuKeeper.NuGet.Api
 {
     public class ApiPackageLookup : IApiPackageLookup
     {
+        private readonly ILogger _logger = new ConsoleLogger();
+
         public async Task<IPackageSearchMetadata> LookupLatest(string packageName)
         {
             var versions = await Lookup(packageName);
-            return versions.FirstOrDefault();
+            return versions
+                .OrderByDescending(p => p?.Identity?.Version)
+                .FirstOrDefault();
         }
 
         private async Task<IEnumerable<IPackageSearchMetadata>> Lookup(string packageName)
         {
             var sourceRepository = BuildSourceRepository();
-            var searchResource = await sourceRepository.GetResourceAsync<PackageSearchResource>();
-
-            return await SearchForPackages(searchResource, packageName);
+            var metadataResource = await sourceRepository.GetResourceAsync<PackageMetadataResource>();
+            return await FindPackage(metadataResource, packageName);
         }
 
         private static SourceRepository BuildSourceRepository()
@@ -35,15 +39,11 @@ private static SourceRepository BuildSourceRepository()
             return new SourceRepository(packageSource, providers);
         }
 
-        private static async Task<IEnumerable<IPackageSearchMetadata>> SearchForPackages(PackageSearchResource searchResource, string packageName)
-        {
-            var logger = new ConsoleLogger();
-            var filter = new SearchFilter(false);
-
-            var packages = await searchResource
-                .SearchAsync(packageName, filter, 0, 10, logger, CancellationToken.None);
-
-            return packages;
+        private async Task<IEnumerable<IPackageSearchMetadata>> FindPackage(
+            PackageMetadataResource metadataResource, string packageName)
+        { 
+            return await metadataResource
+                .GetMetadataAsync(packageName, false, false, _logger, CancellationToken.None);
         }
     }
 }