Ensure test checks for latest package version

Author: Jason Zhai

test/dotnet-new.Tests/Approvals/DotnetNewDetailsTest.CanDisplayDetails_InstalledPackage_OtherFeed.verified.txt

@@ -1,7 +1,9 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
+using System.Text.RegularExpressions;
 using Microsoft.DotNet.Cli.Utils;
+using Newtonsoft.Json.Linq;
 
 namespace Microsoft.DotNet.Cli.New.IntegrationTests
 {
@@ -59,9 +61,12 @@ public Task CanDisplayDetails_RemotePackage_OtherFeedWithVersion()
         }
 
         [Fact]
-        public Task CanDisplayDetails_RemotePackage_OtherFeedNoVersion()
+        public async Task CanDisplayDetails_RemotePackage_OtherFeedNoVersion()
         {
-            CommandResult commandResult = new DotnetNewCommand(_log, "details", "NUnit3.DotNetNew.Template")
+            string packageName = "Microsoft.Azure.WebJobs.ItemTemplates";
+            string latestVersion = await GetLatestVersion(packageName);
+
+            CommandResult commandResult = new DotnetNewCommand(_log, "details", packageName)
             .WithCustomHive(CreateTemporaryFolder(folderName: "Home"))
                 .WithWorkingDirectory(CreateTemporaryFolder())
                 .Execute();
@@ -70,7 +75,9 @@ public Task CanDisplayDetails_RemotePackage_OtherFeedNoVersion()
                 .Should()
                 .Pass();
 
-            return Verify(commandResult.StdOut);
+            ExtractVersion(commandResult.StdOut)
+                .Should()
+                .Be(latestVersion);
         }
 
         [Fact]
@@ -126,18 +133,21 @@ public Task CanDisplayDetails_InstalledPackage_NuGetFeed()
         }
 
         [Fact]
-        public Task CanDisplayDetails_InstalledPackage_OtherFeed()
+        public async Task CanDisplayDetails_InstalledPackage_OtherFeed()
         {
+            string packageName = "Microsoft.Azure.WebJobs.ItemTemplates";
+            string latestVersion = await GetLatestVersion(packageName);
+
             string home = CreateTemporaryFolder(folderName: "Home");
-            new DotnetNewCommand(_log, "install", "NUnit3.DotNetNew.Template")
+            new DotnetNewCommand(_log, "install", packageName)
                 .WithoutBuiltInTemplates().WithCustomHive(home)
                 .WithWorkingDirectory(CreateTemporaryFolder())
                 .Execute()
                 .Should()
                 .ExitWith(0)
                 .And.NotHaveStdErr();
 
-            CommandResult commandResult = new DotnetNewCommand(_log, "details", "NUnit3.DotNetNew.Template")
+            CommandResult commandResult = new DotnetNewCommand(_log, "details", packageName)
                 .WithCustomHive(home).WithoutBuiltInTemplates()
                 .WithWorkingDirectory(CreateTemporaryFolder())
                 .Execute();
@@ -146,7 +156,9 @@ public Task CanDisplayDetails_InstalledPackage_OtherFeed()
                 .Should()
                 .Pass();
 
-            return Verify(commandResult.StdOut);
+            ExtractVersion(commandResult.StdOut)
+                .Should()
+                .Be(latestVersion);
         }
 
         [Fact]
@@ -173,5 +185,32 @@ public Task CanDisplayDetails_InstalledPackage_FolderInstallation()
             return Verify(commandResult.StdOut)
                 .AddScrubber(output => output.ScrubAndReplace(basicFSharp, "%TEMPLATE FOLDER%"));
         }
+
+        private async Task<string> GetLatestVersion(string packageName)
+        {
+            using (HttpClient client = new HttpClient())
+            {
+                string json = await client.GetStringAsync($"https://api.nuget.org/v3-flatcontainer/{packageName}/index.json");
+                JObject obj = JObject.Parse(json);
+
+                var versions = obj["versions"]?.ToObject<List<string>>();
+                if (versions == null || versions.Count == 0)
+                {
+                    throw new Exception("No versions found.");
+                }
+
+                return versions.Last();
+            }
+        }
+
+        private string ExtractVersion(string stdOut)
+        {
+            var match = Regex.Match(stdOut, @"Package version:\s*(\S+)");
+            if (match.Success)
+            {
+                return match.Groups[1].Value;
+            }
+            throw new Exception("Version not found in the output.");
+        }
     }
 }