Add the missing tests for type UnrealFlags<PackageFlags>.

Test/UnrealFlagsTests.cs

@@ -0,0 +1,37 @@
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using UELib.Branch;
+using UELib.Flags;
+
+namespace Eliot.UELib.Test
+{
+    /// <summary>
+    /// Test if the mechanics of <see cref="UnrealFlags{TEnum}"/> are working properly.
+    ///
+    /// We do not test if the mappings are correct for UE1-3 here, mere a verification of the mapping approach.
+    /// </summary>
+    [TestClass]
+    public class UnrealFlagsTests
+    {
+        [TestMethod]
+        public void TestUnrealPackageFlags()
+        {
+            const ulong serializedFlags =
+                (ulong)(DefaultEngineBranch.PackageFlagsDefault.AllowDownload |
+                        DefaultEngineBranch.PackageFlagsDefault.ServerSideOnly);
+
+            var flagsMap = new ulong[(int)PackageFlags.Max];
+            flagsMap[(int)PackageFlags.AllowDownload] = (ulong)DefaultEngineBranch.PackageFlagsDefault.AllowDownload;
+            flagsMap[(int)PackageFlags.ServerSideOnly] = (ulong)DefaultEngineBranch.PackageFlagsDefault.ServerSideOnly;
+            var flags = new UnrealFlags<PackageFlags>(serializedFlags, ref flagsMap);
+
+            // Verify mapped flags
+            Assert.IsTrue(flags.HasFlag(PackageFlags.AllowDownload));
+            Assert.IsTrue(flags.HasFlag(PackageFlags.ServerSideOnly));
+            Assert.IsFalse(flags.HasFlag(PackageFlags.ClientOptional));
+
+            // Verify actual flags
+            Assert.IsTrue(flags.HasFlags((uint)DefaultEngineBranch.PackageFlagsDefault.AllowDownload));
+            Assert.IsFalse(flags.HasFlags((uint)DefaultEngineBranch.PackageFlagsDefault.ClientOptional));
+        }
+    }
+}