Add unit tests for PR URL conversion

Co-authored-by: premun <[email protected]>

Author: Copilot

test/ProductConstructionService.Api.Tests/PullRequestUrlConversionTests.cs

@@ -0,0 +1,50 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Reflection;
+using AwesomeAssertions;
+using ProductConstructionService.Api.Api.v2020_02_20.Controllers;
+
+namespace ProductConstructionService.Api.Tests;
+
+[TestFixture]
+public class PullRequestUrlConversionTests
+{
+    [TestCase("https://api.github.com/repos/dotnet/dotnet/pulls/3205", "https://github.com/dotnet/dotnet/pull/3205")]
+    [TestCase("https://api.github.com/repos/dotnet/runtime/pulls/12345", "https://github.com/dotnet/runtime/pull/12345")]
+    [TestCase("https://api.github.com/repos/microsoft/CsWinRT/pulls/999", "https://github.com/microsoft/CsWinRT/pull/999")]
+    public void TurnApiUrlToWebsite_ConvertsGitHubApiUrlsToWebUrls(string apiUrl, string expectedWebUrl)
+    {
+        // Use reflection to call the private static method TurnApiUrlToWebsite
+        var method = typeof(PullRequestController).GetMethod("TurnApiUrlToWebsite", BindingFlags.NonPublic | BindingFlags.Static);
+        method.Should().NotBeNull("TurnApiUrlToWebsite method should exist");
+
+        var result = method!.Invoke(null, [apiUrl, null, null]) as string;
+        result.Should().Be(expectedWebUrl);
+    }
+
+    [TestCase("https://dev.azure.com/dnceng/7ea9116e-9fac-403d-b258-b31fcf1bb293/_apis/git/repositories/test-repo-guid/pullRequests/123", 
+              "https://dev.azure.com/dnceng/internal/_git/test-repo-guid/pullrequest/123")]
+    public void TurnApiUrlToWebsite_ConvertsAzureDevOpsApiUrlsToWebUrls(string apiUrl, string expectedWebUrl)
+    {
+        // Use reflection to call the private static method TurnApiUrlToWebsite
+        var method = typeof(PullRequestController).GetMethod("TurnApiUrlToWebsite", BindingFlags.NonPublic | BindingFlags.Static);
+        method.Should().NotBeNull("TurnApiUrlToWebsite method should exist");
+
+        var result = method!.Invoke(null, [apiUrl, null, null]) as string;
+        result.Should().Be(expectedWebUrl);
+    }
+
+    [TestCase("https://github.com/dotnet/dotnet/pull/3205")]
+    [TestCase("https://dev.azure.com/dnceng/internal/_git/dotnet-wpf/pullrequest/123")]
+    [TestCase("not-a-url")]
+    public void TurnApiUrlToWebsite_ReturnsOriginalUrlWhenNotApiUrl(string url)
+    {
+        // Use reflection to call the private static method TurnApiUrlToWebsite
+        var method = typeof(PullRequestController).GetMethod("TurnApiUrlToWebsite", BindingFlags.NonPublic | BindingFlags.Static);
+        method.Should().NotBeNull("TurnApiUrlToWebsite method should exist");
+
+        var result = method!.Invoke(null, [url, null, null]) as string;
+        result.Should().Be(url);
+    }
+}