public void ItHandlesNullITaskItemArray()
        {
            var resolver = new PackageOverrideResolver <MockConflictItem>(null);

            Assert.Null(resolver.PackageOverrides);
            Assert.Null(resolver.Resolve(new MockConflictItem(), new MockConflictItem()));
        }
        public void ItHandlesNullPackageIds()
        {
            ITaskItem[] packageOverrides = new[]
            {
                new MockTaskItem("FakePlatform", new Dictionary <string, string>
                {
                    { MetadataKeys.OverriddenPackages, "System.Ben|4.2.0;System.Jobst-Immo|4.2.0;System.Livar|4.3.0;System.Dave|4.2.0" }
                })
            };

            var resolver = new PackageOverrideResolver <MockConflictItem>(packageOverrides);

            Assert.NotNull(resolver.PackageOverrides);

            var packageItem = new MockConflictItem("System.Eric")
            {
                PackageId       = "System.Eric",
                PackageVersion  = new Version(4, 0, 0),
                AssemblyVersion = new Version(4, 0, 0, 0),
                ItemType        = ConflictItemType.Reference
            };

            var platformItem = new MockConflictItem("System.Eric")
            {
                PackageId       = null,
                AssemblyVersion = new Version(4, 1, 0, 0),
                ItemType        = ConflictItemType.Platform
            };

            Assert.Null(resolver.Resolve(packageItem, platformItem));
            Assert.Null(resolver.Resolve(platformItem, packageItem));

            var packageItem2 = new MockConflictItem("System.Eric")
            {
                PackageId       = "FakePlatform",
                PackageVersion  = new Version(4, 0, 0),
                AssemblyVersion = new Version(4, 0, 0, 0),
                ItemType        = ConflictItemType.Reference
            };

            Assert.Null(resolver.Resolve(packageItem2, platformItem));
            Assert.Null(resolver.Resolve(platformItem, packageItem2));
        }