/// <summary>
        /// Checks whether an IPackage exists within a PackageManager.  By default, will use the UseSideBySide settings of the DefaultPackagePathProvider the PackageManager is instantiated with.
        /// If passed in TRUE for exhaustive, will check both with and without UseSideBySide set.
        /// </summary>
        /// <param name="packageManager"></param>
        /// <param name="package"></param>
        /// <param name="exhaustive"></param>
        /// <returns></returns>
        public static bool IsPackageInstalled(this PackageManager packageManager,  IPackage package, bool exhaustive = false)
        {

            var pathsDictionary = new Dictionary<string, bool>();
            //Oh god oh god. The <center> cannot hold it is too late.
            var useSideBySide = packageManager.PathResolver.GetPrivateField<bool>("_useSideBySidePaths");
            pathsDictionary.Add(Path.Combine(packageManager.PathResolver.GetInstallPath(package), 
                packageManager.PathResolver.GetPackageFileName(package.Id, package.Version)), useSideBySide);

            //We need to also check the inverse, to see if it was installed with the other setting....
            if (exhaustive)
            {
                var inversePathResolver = new DefaultPackagePathResolver(packageManager.PathResolver.GetPrivateField<IFileSystem>("_fileSystem"), !useSideBySide);
                pathsDictionary.Add(Path.Combine(inversePathResolver.GetInstallPath(package), inversePathResolver.GetPackageFileName(package.Id, package.Version)), !useSideBySide);
            }

            foreach (var path in pathsDictionary.Where(path => packageManager.FileSystem.FileExists(path.Key)))
            {
                if (path.Value)
                {
                    return true;
                }
                
                //If not useSideBySide, we need to crack open the zip file.
                //Need to crack the package open at this point and check the version, otherwise we just need to download it regardless
                var zipPackage = new ZipPackage(packageManager.FileSystem.OpenFile(path.Key));
                if (zipPackage.Version == package.Version)
                {
                    return true;
                }
            }

            //Its not here.  Really.  We tried.
            return false;
        }

        private IEnumerable<ITaskItem> ResolvePackage(ITaskItem package)
        {
            string id = package.ItemSpec;
            string version = package.GetMetadata("Version");

            Log.LogMessage(MessageImportance.Normal, "Resolving Package Reference {0} {1}...", id, version);

            // Initial version just searches a machine-level repository

            var localFs = new PhysicalFileSystem(Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "NuGet", "Lib"));
            var defaultResolver = new DefaultPackagePathResolver(localFs);
            var machineRepo = new LocalPackageRepository(defaultResolver, localFs);
            var buildRepo = new BuildPackageRepository();
            var remoteRepo = new DataServicePackageRepository(new Uri("https://nuget.org/api/v2"));
            var project = new BuildProjectSystem(ProjectDirectory, new FrameworkName(TargetFramework), CurrentReferences);
            var manager = new PackageManager(remoteRepo, defaultResolver, localFs, machineRepo);
            var projectManager = new ProjectManager(remoteRepo, defaultResolver, project, buildRepo);

            // Install the package
            var ver = new SemanticVersion(version);
            manager.PackageInstalling += manager_PackageInstalling;
            manager.InstallPackage(id, ver);
            projectManager.AddPackageReference(id, ver);

            return project.OutputReferences.Select(item =>
            {
                var name = AssemblyName.GetAssemblyName(item);
                return new TaskItem(name.FullName, new Dictionary<string, string>() {
                    {"HintPath", item },
                    {"Private", "true"}
                });
            });
        }

        public void FindPackageFindTheRightPackage()
        {
            // Arrange
            var fileSystem = new MockFileSystem("c:\\");
            AddPackage(fileSystem, "A", "1.0");
            AddPackage(fileSystem, "B", "1.0-alpha");
            AddPackage(fileSystem, "C", "2.0.1-RC");
            AddPackage(fileSystem, "D", "3.0");

            // these are invalid packages (missing corresponding directory)
            fileSystem.AddFile("AA.2.0.nupkg");
            fileSystem.AddFile("BB.4.0.nupkg");
            fileSystem.CreateDirectory("BB.3.0");

            var pathResolver = new DefaultPackagePathResolver("c:\\");
            var repository = new UnzippedPackageRepository(pathResolver, fileSystem);

            // Act
            var packageA = repository.FindPackage("A", new SemanticVersion("1.0"));
            var packageB = repository.FindPackage("B", new SemanticVersion("1.0-alpha"));

            // Assert
            AssertPackage(packageA, "A", new SemanticVersion("1.0"));
            AssertPackage(packageB, "B", new SemanticVersion("1.0.0-alpha"));
        }

        public void InstallMetadataPackageWithReadMeInstallsIntoProjectAndPackageManager()
        {
            // Arrange
            var localRepository = new Mock<MockPackageRepository>() { CallBase = true }.As<ISharedPackageRepository>().Object;
            var sourceRepository = new MockPackageRepository();
            var projectSystem = new MockProjectSystem();
            var pathResolver = new DefaultPackagePathResolver(projectSystem);
            var projectManager = new ProjectManager(localRepository, pathResolver, new MockProjectSystem(), new MockPackageRepository());
            var packageManager = new VsPackageManager(TestUtils.GetSolutionManager(), sourceRepository, new Mock<IFileSystemProvider>().Object, projectSystem, localRepository, new Mock<IDeleteOnRestartManager>().Object, new Mock<VsPackageInstallerEvents>().Object);

            var packageA = PackageUtility.CreatePackage("A", "1.0", dependencies: new[] { new PackageDependency("B") });
            var mockPackageA = Mock.Get(packageA);
            mockPackageA.Setup(m => m.GetFiles()).Returns(PackageUtility.CreateFiles(new[] { "readme.txt" }));

            var packageB = PackageUtility.CreatePackage("B", "1.0", content: new[] { "hello.txt" });
            sourceRepository.AddPackage(packageA);
            sourceRepository.AddPackage(packageB);

            // Act
            packageManager.InstallPackage(projectManager, "A", new SemanticVersion("1.0"), ignoreDependencies: false, allowPrereleaseVersions: false, logger: NullLogger.Instance);

            // Assert
            Assert.True(packageManager.LocalRepository.Exists(packageA));
            Assert.True(projectManager.LocalRepository.Exists(packageA));

            Assert.True(packageManager.LocalRepository.Exists(packageB));
            Assert.True(projectManager.LocalRepository.Exists(packageB));
        }

        public void InstallPackageAddsAllFilesToFileSystem()
        {
            // Arrange
            var projectSystem = new MockProjectSystem();
            var sourceRepository = new MockPackageRepository();
            var pathResolver = new DefaultPackagePathResolver(projectSystem);
            var packageManager = new PackageManager(sourceRepository, pathResolver, projectSystem, 
                new SharedPackageRepository(pathResolver, projectSystem, projectSystem));

            IPackage packageA = PackageUtility.CreatePackage("A", "1.0",
                                                             new[] { "contentFile", @"sub\contentFile" },
                                                             new[] { @"lib\reference.dll" },
                                                             new[] { @"readme.txt" });

            sourceRepository.AddPackage(packageA);

            // Act
            Install("A", new NullProjectManager(packageManager));

            // Assert
            Assert.Equal(0, projectSystem.References.Count);
            Assert.Equal(5, projectSystem.Paths.Count);
            Assert.True(projectSystem.FileExists(@"A.1.0\content\contentFile"));
            Assert.True(projectSystem.FileExists(@"A.1.0\content\sub\contentFile"));
            Assert.True(projectSystem.FileExists(@"A.1.0\lib\reference.dll"));
            Assert.True(projectSystem.FileExists(@"A.1.0\tools\readme.txt"));
            Assert.True(projectSystem.FileExists(@"A.1.0\A.1.0.nupkg"));
        }

        public void GetPackagesReturnsAllValidPackages()
        {
            // Arrange
            var fileSystem = new MockFileSystem("c:\\");
            AddPackage(fileSystem, "A", "1.0");
            AddPackage(fileSystem, "B", "1.0-alpha");
            AddPackage(fileSystem, "C", "2.0.1-RC");
            AddPackage(fileSystem, "D", "3.0");

            // these are invalid packages (missing corresponding directory)
            fileSystem.AddFile("AA.2.0.nupkg");
            fileSystem.AddFile("BB.4.0.nupkg");
            fileSystem.CreateDirectory("BB.3.0");

            var pathResolver = new DefaultPackagePathResolver("c:\\");
            var repository = new UnzippedPackageRepository(pathResolver, fileSystem);

            // Act
            var packages = repository.GetPackages().ToList();

            // Assert
            Assert.Equal(4, packages.Count);
            AssertPackage(packages[0], "A", new SemanticVersion("1.0"));
            AssertPackage(packages[1], "B", new SemanticVersion("1.0.0-alpha"));
            AssertPackage(packages[2], "C", new SemanticVersion("2.0.1-RC"));
            AssertPackage(packages[3], "D", new SemanticVersion("3.0"));
        }

        public void InstallPackageRunsInitAndInstallScripts()
        {
            // Arrange
            var localRepository = new Mock<MockPackageRepository>() { CallBase = true }.As<ISharedPackageRepository>().Object;
            var sourceRepository = new MockPackageRepository();
            var projectRepository = new MockProjectPackageRepository(localRepository);
            var fileSystem = new MockFileSystem();
            var projectSystem = new MockProjectSystem();
            var pathResolver = new DefaultPackagePathResolver(new MockProjectSystem());
            var project = TestUtils.GetProject("Foo");
            var projectManager = new ProjectManager(localRepository, pathResolver, projectSystem, projectRepository);
            var scriptExecutor = new Mock<IScriptExecutor>();
            var packageManager = new Mock<VsPackageManager>(TestUtils.GetSolutionManager(), sourceRepository, new Mock<IFileSystemProvider>().Object, fileSystem, localRepository, new Mock<IRecentPackageRepository>().Object, 
                new Mock<VsPackageInstallerEvents>().Object) { CallBase = true };
            var packageManagerFactory = new Mock<IVsPackageManagerFactory>();
            packageManagerFactory.Setup(m => m.CreatePackageManager(It.IsAny<IPackageRepository>(), false, false)).Returns(packageManager.Object);
            packageManager.Setup(m => m.GetProjectManager(project)).Returns(projectManager);

            var package = NuGet.Test.PackageUtility.CreatePackage("foo", "1.0", new[] { "hello" }, tools: new[] { "init.ps1", "install.ps1" });
            sourceRepository.AddPackage(package);
            var installer = new VsPackageInstaller(packageManagerFactory.Object, scriptExecutor.Object, new Mock<IPackageRepositoryFactory>().Object, new Mock<IVsCommonOperations>().Object, new Mock<ISolutionManager>().Object);

            // Act
            installer.InstallPackage(sourceRepository, project, "foo", new SemanticVersion("1.0"), ignoreDependencies: false, skipAssemblyReferences: false);

            // Assert
            scriptExecutor.Verify(e => e.Execute(It.IsAny<string>(), PowerShellScripts.Init, It.IsAny<IPackage>(), It.IsAny<Project>(), It.IsAny<ILogger>()), Times.Once());
            scriptExecutor.Verify(e => e.Execute(It.IsAny<string>(), PowerShellScripts.Install, It.IsAny<IPackage>(), It.IsAny<Project>(), It.IsAny<ILogger>()), Times.Once());
        }

        public void ReinstallPackagesRestoresPackageWithTheSameVersion()
        {
            // Arrange
            var localRepository = new Mock<MockPackageRepository>() { CallBase = true }.As<ISharedPackageRepository>().Object;
            var sourceRepository = new MockPackageRepository();
            var projectSystem = new MockProjectSystem();
            var pathResolver = new DefaultPackagePathResolver(projectSystem);
            var projectManager = new ProjectManager(localRepository, pathResolver, projectSystem, new MockPackageRepository());

            var packageManager = new VsPackageManager(
                TestUtils.GetSolutionManager(),
                sourceRepository,
                new Mock<IFileSystemProvider>().Object,
                projectSystem,
                localRepository,
                new Mock<IDeleteOnRestartManager>().Object,
                new Mock<VsPackageInstallerEvents>().Object);

            var packageA = PackageUtility.CreatePackage("A", "1.2", new[] { "content.txt" });
            sourceRepository.Add(packageA);
            localRepository.AddPackage(packageA);
            projectManager.LocalRepository.AddPackage(packageA);

            // Act
            packageManager.ReinstallPackage(projectManager, "A", updateDependencies: true, allowPrereleaseVersions: true, logger: null);

            // Assert
            Assert.True(packageManager.LocalRepository.Exists("A", new SemanticVersion("1.2")));
            Assert.True(projectManager.LocalRepository.Exists("A", new SemanticVersion("1.2")));
        }

        public void InstallPackageSetOperationToInstall3()
        {
            // Arrange
            var localRepository = new MockSharedPackageRepository();
            var sourceRepository = new MockPackageRepository();
            var projectSystem = new MockProjectSystem();
            var pathResolver = new DefaultPackagePathResolver(projectSystem);
            var projectManager = new ProjectManager(localRepository, pathResolver, new MockProjectSystem(), new MockPackageRepository());
            var packageManager = new VsPackageManager(TestUtils.GetSolutionManager(), sourceRepository, new Mock<IFileSystemProvider>().Object, projectSystem, localRepository, new Mock<IDeleteOnRestartManager>().Object, new Mock<VsPackageInstallerEvents>().Object);

            var package = PackageUtility.CreatePackage("foo", "1.0", new[] { "hello" });
            sourceRepository.AddPackage(package);

            var package2 = PackageUtility.CreatePackage("bar", "2.0", new[] { "world" });
            sourceRepository.AddPackage(package2);

            // Act
            packageManager.InstallPackage(
                projectManager,
                package2,
                new PackageOperation[] { 
                    new PackageOperation(package, PackageAction.Install),
                    new PackageOperation(package2, PackageAction.Install),
                },
                ignoreDependencies: false, 
                allowPrereleaseVersions: false, 
                logger: NullLogger.Instance);

            // Assert
            Assert.Equal("Install", sourceRepository.LastOperation);
            Assert.Equal("bar", sourceRepository.LastMainPackageId);
            Assert.Equal("2.0", sourceRepository.LastMainPackageVersion);
        }

        public void InstallPackageDoesNotUseFallbackRepository()
        {
            // Arrange
            var localRepository = new Mock<MockPackageRepository>() { CallBase = true }.As<ISharedPackageRepository>().Object;
            var sourceRepository = new MockPackageRepository();
            var projectRepository = new MockProjectPackageRepository(localRepository);
            var fileSystem = new MockFileSystem();
            var projectSystem = new MockProjectSystem();
            var pathResolver = new DefaultPackagePathResolver(new MockProjectSystem());
            var project = TestUtils.GetProject("Foo");
            var projectManager = new ProjectManager(localRepository, pathResolver, projectSystem, projectRepository);
            var scriptExecutor = new Mock<IScriptExecutor>();
            var packageManager = new Mock<VsPackageManager>(TestUtils.GetSolutionManager(), sourceRepository, fileSystem, localRepository, new Mock<IRecentPackageRepository>().Object, 
                new Mock<VsPackageInstallerEvents>().Object) { CallBase = true };
            var packageManagerFactory = new Mock<IVsPackageManagerFactory>();
            packageManagerFactory.Setup(m => m.CreatePackageManager(It.IsAny<IPackageRepository>(), false, false)).Returns(packageManager.Object);
            packageManagerFactory.Setup(m => m.CreatePackageManager()).Throws(new Exception("A"));
            packageManagerFactory.Setup(m => m.CreatePackageManager(It.IsAny<IPackageRepository>(), true, It.IsAny<bool>())).Throws(new Exception("B"));
            packageManager.Setup(m => m.GetProjectManager(project)).Returns(projectManager);

            var package = NuGet.Test.PackageUtility.CreatePackage("foo", "1.0", new[] { "hello" }, tools: new[] { "init.ps1", "install.ps1" });
            sourceRepository.AddPackage(package);
            var installer = new VsPackageInstaller(packageManagerFactory.Object, scriptExecutor.Object, new Mock<IPackageRepositoryFactory>().Object);

            // Act
            installer.InstallPackage(sourceRepository, project, "foo", new SemanticVersion("1.0"), ignoreDependencies: false);

            // Assert
            packageManagerFactory.Verify(m => m.CreatePackageManager(It.IsAny<IPackageRepository>(), false, false), Times.Once());
            packageManagerFactory.Verify(m => m.CreatePackageManager(), Times.Never());
            packageManagerFactory.Verify(m => m.CreatePackageManager(It.IsAny<IPackageRepository>(), true, It.IsAny<bool>()), Times.Never());
        }

        public void InstallPackageWithOperationsExecuteAllOperations()
        {
            // Arrange
            var localRepository = new Mock<MockPackageRepository>() { CallBase = true }.As<ISharedPackageRepository>().Object;
            var sourceRepository = new MockPackageRepository();
            var projectSystem = new MockProjectSystem();
            var pathResolver = new DefaultPackagePathResolver(projectSystem);
            var projectManager = new ProjectManager(localRepository, pathResolver, new MockProjectSystem(), new MockPackageRepository());
            var packageManager = new VsPackageManager(TestUtils.GetSolutionManager(), sourceRepository, projectSystem, localRepository, new Mock<IRecentPackageRepository>().Object);

            var package = PackageUtility.CreatePackage("foo", "1.0", new[] { "hello" }, dependencies: new PackageDependency[] { new PackageDependency("bar") });
            sourceRepository.AddPackage(package);

            var package2 = PackageUtility.CreatePackage("bar", "2.0", new[] { "world" });
            sourceRepository.AddPackage(package2);

            var package3 = PackageUtility.CreatePackage("awesome", "1.0", new[] { "candy" });
            localRepository.AddPackage(package3);

            var operations = new PackageOperation[] {
                 new PackageOperation(package, PackageAction.Install),
                 new PackageOperation(package2, PackageAction.Install),
                 new PackageOperation(package3, PackageAction.Uninstall)
             };

            // Act
            packageManager.InstallPackage(projectManager, package, operations, ignoreDependencies: false, logger: NullLogger.Instance);

            // Assert
            Assert.IsTrue(packageManager.LocalRepository.Exists(package));
            Assert.IsTrue(packageManager.LocalRepository.Exists(package2));
            Assert.IsTrue(!packageManager.LocalRepository.Exists(package3));
            Assert.IsTrue(projectManager.LocalRepository.Exists(package));
            Assert.IsTrue(projectManager.LocalRepository.Exists(package2));
        }

        public void SupportsPrereleasePackagesReturnsTrue()
        {
            // Arrange
            var fileSystem = new MockFileSystem("c:\\");
            var pathResolver = new DefaultPackagePathResolver("c:\\");

            // Act
            var repository = new UnzippedPackageRepository(pathResolver, fileSystem);

            // Assert
            Assert.True(repository.SupportsPrereleasePackages);
        }

        public void Setup()
        {
            var mfs = new Mock<MockFileSystem>() { CallBase = true };
            var pr = new DefaultPackagePathResolver(mfs.Object);
            var mc = MachineCache.Default;
            var l = new LocalPackageRepository(pr, mfs.Object);

            var r1 = new DataServicePackageRepository(new Uri(@"http://nuget.org"));
            var r2 = new DataServicePackageRepository(new Uri(@"http://beta.nuget.org"));

            ar = new AggregateRepository(new List<IPackageRepository>() { mc, l, r1, r2 });
        }

        public void GetPackageDirectoryWithSideBySideOnAppendsVersionToEndOfPackageDirectory()
        {
            // Arrange
            MockFileSystem fs = new MockFileSystem();
            DefaultPackagePathResolver resolver = new DefaultPackagePathResolver(fs);
            IPackage testPackage = PackageUtility.CreatePackage("Test");

            // Act
            string packageDir = resolver.GetPackageDirectory(testPackage);

            // Assert
            Assert.Equal("Test.1.0", packageDir);
        }

        public void GetPackageFileNameWithSideBySideOffDoesNotAppendVersionToEndOfPackageDirectory()
        {
            // Arrange
            MockFileSystem fs = new MockFileSystem();
            DefaultPackagePathResolver resolver = new DefaultPackagePathResolver(fs, useSideBySidePaths: false);
            IPackage testPackage = PackageUtility.CreatePackage("Test");

            // Act
            string packageDir = resolver.GetPackageFileName(testPackage);

            // Assert
            Assert.Equal("Test" + Constants.PackageExtension, packageDir);
        }

        public void GetInstallPathPrependsFileSystemRootToPackageDirectory()
        {
            // Arrange
            MockFileSystem fs = new MockFileSystem();
            DefaultPackagePathResolver resolver = new DefaultPackagePathResolver(fs);
            IPackage testPackage = PackageUtility.CreatePackage("Test");

            // Act
            string installPath = resolver.GetInstallPath(testPackage);

            // Assert
            Assert.Equal(fs.Root + "Test.1.0", installPath);
        }

        public void FindPackageReturnsPackageWithUnVersionedFileNameWhenUsingVersionlessPathResolver(string id, string version, string packageName)
        {
            // Arrange
            var repositoryRoot = CreatePackage(id, version, packageName);
            var fileSystem = new PhysicalFileSystem(repositoryRoot);
            var pathResolver = new DefaultPackagePathResolver(fileSystem, useSideBySidePaths: false);
            var repository = new LocalPackageRepository(pathResolver, fileSystem);

            // Act
            var findPackage = repository.FindPackage(id, new SemanticVersion(version));
            
            // Assert
            AssertPackage(id, version, findPackage);
        }

        public void InstallPackageUsesProjectTargetFramework()
        {
            // Arrange
            var localRepository = new Mock<MockPackageRepository>() { CallBase = true }.As<ISharedPackageRepository>().Object;
            var sourceRepository = new MockPackageRepository();
            var projectSystem = new MockProjectSystem(new FrameworkName(".NETFramework, Version=4.5"));
            var pathResolver = new DefaultPackagePathResolver(projectSystem);
            var projectManager = new ProjectManager(localRepository, pathResolver, projectSystem, new MockPackageRepository());
            var packageManager = new VsPackageManager(
                TestUtils.GetSolutionManager(), 
                sourceRepository, 
                new Mock<IFileSystemProvider>().Object, 
                projectSystem, 
                localRepository, 
                new Mock<IRecentPackageRepository>().Object, 
                new Mock<VsPackageInstallerEvents>().Object);

            var dependencySets = new PackageDependencySet[] {
                new PackageDependencySet(
                    new FrameworkName(".NETFramework, Version=4.5"),
                    new [] { new PackageDependency("B") }),

                new PackageDependencySet(
                    new FrameworkName(".NETFramework, Version=4.0"),
                    new [] { new PackageDependency("C") })
            };

            var package = PackageUtility.CreatePackageWithDependencySets(
                "foo", 
                "1.0", 
                new[] { "hello" },
                dependencySets: dependencySets);

            var packageB = PackageUtility.CreatePackage("B", "2.0", new[] { "good morning" });
            var packageC = PackageUtility.CreatePackage("C", "2.0", new[] { "good morning" });
            sourceRepository.AddPackage(package);
            sourceRepository.AddPackage(packageB);
            sourceRepository.AddPackage(packageC);

            // Act
            packageManager.InstallPackage(projectManager, "foo", new SemanticVersion("1.0"), ignoreDependencies: false, allowPrereleaseVersions: false, logger: NullLogger.Instance);

            // Assert
            Assert.True(packageManager.LocalRepository.Exists(package));
            Assert.True(packageManager.LocalRepository.Exists(packageB));
            Assert.False(packageManager.LocalRepository.Exists(packageC));
            Assert.True(projectManager.LocalRepository.Exists(package));
            Assert.True(projectManager.LocalRepository.Exists(packageB));
        }

        public void ReinstallPackagesSkipsReinstallingIfPackageDoesNotExistAndLogWarning()
        {
            // Arrange
            var localRepository = new Mock<MockPackageRepository>() { CallBase = true }.As<ISharedPackageRepository>().Object;
            var sourceRepository = new MockPackageRepository();
            var projectSystem = new MockProjectSystem();
            var pathResolver = new DefaultPackagePathResolver(projectSystem);
            var projectManager = new ProjectManager(localRepository, pathResolver, projectSystem, new MockPackageRepository());

            var installerEvents = new Mock<VsPackageInstallerEvents>(MockBehavior.Strict);
            int eventCount = 0;
            RegisterInstallerEvents(installerEvents, _ => eventCount++);

            var packageManager = new VsPackageManager(
                TestUtils.GetSolutionManager(),
                sourceRepository,
                new Mock<IFileSystemProvider>().Object,
                projectSystem,
                localRepository,
                new Mock<IDeleteOnRestartManager>().Object,
                installerEvents.Object);

            var packageA = PackageUtility.CreatePackage("A", "1.2", new[] { "content.txt" });
            sourceRepository.Add(packageA);
            localRepository.AddPackage(packageA);
            projectManager.LocalRepository.AddPackage(packageA);

            // remove package from source repository to simulate missing package condition
            sourceRepository.Remove(packageA);

            var logger = new Mock<ILogger>();
            logger.Setup(s => s.Log(
                MessageLevel.Warning, 
                "Skipped reinstalling package '{0}' in project '{1}' because the package does not exist in the package source.", 
                "A 1.2",
                "x:\\MockFileSystem")
            ).Verifiable();

            // Act
            packageManager.ReinstallPackage(projectManager, "A", updateDependencies: true, allowPrereleaseVersions: true, logger: logger.Object);

            // Assert
            logger.Verify();
            Assert.Equal(0, eventCount);

            Assert.True(packageManager.LocalRepository.Exists("A", new SemanticVersion("1.2")));
            Assert.True(projectManager.LocalRepository.Exists("A", new SemanticVersion("1.2")));
        }

        public void UpdatePackageOverwriteAllFilesWhenFileConflictActionSetToOverwrite()
        {
            // Arrange
            var localRepository = new MockPackageRepository();
            var sourceRepository = new MockPackageRepository();
            var constraintProvider = NullConstraintProvider.Instance;
            var fileSystem = new MockFileSystem();
            var pathResolver = new DefaultPackagePathResolver(fileSystem);
            var projectSystem = new MockProjectSystem();
            projectSystem.AddFile("one.txt", "this is one");
            projectSystem.AddFile("two.txt", "this is two");

            var packages = new List<IPackage>();
            var package_A10 = PackageUtility.CreatePackage("A", "1.0", content: new[] { "1.txt" });
            var package_A12 = PackageUtility.CreatePackage("A", "1.2", content: new[] { "one.txt", "two.txt" });
            localRepository.Add(package_A10);
            sourceRepository.Add(package_A12);

            var sharedRepository = new Mock<ISharedPackageRepository>(MockBehavior.Strict);
            sharedRepository.Setup(s => s.AddPackage(package_A12)).Callback<IPackage>(p => packages.Add(p));
            sharedRepository.Setup(s => s.GetPackages()).Returns(packages.AsQueryable());

            var repositoryFactory = new Mock<IPackageRepositoryFactory>();
            repositoryFactory.Setup(s => s.CreateRepository(It.IsAny<string>())).Returns(sourceRepository);

            var packageSourceProvider = new Mock<IPackageSourceProvider>();
            packageSourceProvider.Setup(s => s.LoadPackageSources()).Returns(new[] { new PackageSource("foo-source") });

            var console = new Mock<IConsole>();
            console.Setup(c => c.ResolveFileConflict(It.IsAny<string>())).Returns(FileConflictResolution.Ignore);

            var updateCommand = new UpdateCommand()
            {
                RepositoryFactory = repositoryFactory.Object,
                SourceProvider = packageSourceProvider.Object,
                Console = console.Object,
                FileConflictAction = FileConflictAction.Overwrite
            };

            // Act
            updateCommand.UpdatePackages(localRepository, fileSystem, sharedRepository.Object, sourceRepository, constraintProvider, pathResolver, projectSystem);

            // Assert
            Assert.True(localRepository.Exists("A", new SemanticVersion("1.2")));
            Assert.Equal("content\\one.txt", projectSystem.ReadAllText("one.txt"));
            Assert.Equal("content\\two.txt", projectSystem.ReadAllText("two.txt"));
        }