Fix NETStandard.Library license detection

Src/PackageGuard.Core/FetchingStrategies/CorrectLicenseUrlsForMisbehavingPackagesFetcher.cs → Src/PackageGuard.Core/FetchingStrategies/CorrectMisbehavingPackagesFetcher.cs

@@ -1,9 +1,9 @@
 namespace PackageGuard.Core.FetchingStrategies;
 
 /// <summary>
-/// A specialized license fetcher that corrects the repository URL for packages that have historically used the wrong URL.
+/// A specialized license fetcher that corrects the metadata for packages that have historically used the wrong repository URL or missed license information.
 /// </summary>
-internal class CorrectLicenseUrlsForMisbehavingPackagesFetcher : IFetchLicense
+internal class CorrectMisbehavingPackagesFetcher : IFetchLicense
 {
     public Task FetchLicenseAsync(PackageInfo package)
     {
@@ -13,6 +13,12 @@ public Task FetchLicenseAsync(PackageInfo package)
             package.RepositoryUrl = "https://github.com/nunit/nunit";
         }
 
+        if (package.Name.Equals("NETStandard.Library", StringComparison.InvariantCultureIgnoreCase))
+        {
+            package.License = "MIT";
+            package.RepositoryUrl = "https://github.com/dotnet/standard";
+        }
+
         return Task.CompletedTask;
     }
 }

Src/PackageGuard.Core/LicenseFetcher.cs

@@ -10,7 +10,7 @@ public sealed class LicenseFetcher(ILogger logger, string? gitHubApiKey = null)
 {
     private readonly IEnumerable<IFetchLicense> fetchers =
     [
-        new CorrectLicenseUrlsForMisbehavingPackagesFetcher(),
+        new CorrectMisbehavingPackagesFetcher(),
         new GitHubLicenseFetcher(gitHubApiKey),
         new UrlLicenseFetcher(logger)
     ];

Src/PackageGuard.Specs/LicenseFetcherSpecs.cs

@@ -69,4 +69,26 @@ public async Task A_no_assertion_license_is_treated_as_unknown()
         // Assert
         package.License.Should().Be("Unknown");
     }
+
+    [TestMethod]
+    public async Task Reports_the_correct_license_for_net_standard_libraries()
+    {
+        // Arrange
+        var fetcher = new LicenseFetcher(NullLogger.Instance, gitHubApiKey);
+
+        var package = new PackageInfo
+        {
+            Name = "NETStandard.Library",
+            Version = "2.0.3",
+            License = null,
+            LicenseUrl = null,
+            RepositoryUrl = null
+        };
+
+        // Act
+        await fetcher.AmendWithMissingLicenseInformation(package);
+
+        // Assert
+        package.License.Should().Be("MIT");
+    }
  }