test case

Author: Nigusu-Allehu

test/NuGet.Core.FuncTests/NuGet.XPlat.FuncTest/Package/Download/PackageDownloadRunnerTests.cs

@@ -813,6 +813,67 @@ public async Task RunAsync_WhenSourceMappingMapsToInsecureSource_AndAllowInsecur
         File.Exists(Path.Combine(installDir, $"{id.ToLowerInvariant()}.{version}.nupkg")).Should().BeTrue();
     }
 
+    [Theory]
+    [InlineData("A", "a")]
+    [InlineData("a", "A")]
+    [InlineData("SourceA", "sourcea")]
+    [InlineData("SOURCEA", "sourcea")]
+    public async Task RunAsync_WithVariousSourceMappingCasing_FindsSourceAndSucceeds(string sourceNameConfig, string sourceNameMapping)
+    {
+        // Arrange
+        using var context = new SimpleTestPathContext();
+        string srcDir = context.PackageSource;
+
+        var id = "Contoso.Casing";
+        var version = "1.0.0";
+
+        await SimpleTestPackageUtility.CreateFullPackageAsync(srcDir, id, version);
+
+        // Add source using one casing
+        context.Settings.AddSource(sourceNameConfig, srcDir);
+
+        // Add mapping using different casing
+        context.Settings.AddPackageSourceMapping(sourceNameMapping, "Contoso.*");
+
+        var settings = Settings.LoadSettingsGivenConfigPaths([context.Settings.ConfigPath]);
+
+        var args = new PackageDownloadArgs
+        {
+            Packages =
+            [
+                new PackageWithNuGetVersion
+                {
+                    Id = id,
+                    NuGetVersion = NuGetVersion.Parse(version)
+                }
+            ],
+            OutputDirectory = context.WorkingDirectory,
+            AllowInsecureConnections = true
+        };
+
+        var logger = new Mock<ILoggerWithColor>(MockBehavior.Loose);
+
+        var packageSources = new List<PackageSource>
+        {
+            new(srcDir, sourceNameConfig),
+        };
+
+        // Act
+        var exit = await PackageDownloadRunner.RunAsync(
+            args,
+            logger.Object,
+            packageSources,
+            settings,
+            CancellationToken.None);
+
+        // Assert
+        exit.Should().Be(PackageDownloadRunner.ExitCodeSuccess);
+
+        var installDir = Path.Combine(context.WorkingDirectory, id.ToLowerInvariant(), version);
+        Directory.Exists(installDir).Should().BeTrue();
+        File.Exists(Path.Combine(installDir, $"{id.ToLowerInvariant()}.{version}.nupkg")).Should().BeTrue();
+    }
+
     [Fact]
     public async Task RunAsync_WhenMappedSourceMissing_LogsVerbose()
     {