Support pre-release packages in Get-Package cmdlet.

src/AddIns/Misc/PackageManagement/Cmdlets/Project/Src/GetPackageCmdlet.cs

@@ -44,6 +44,11 @@ namespace ICSharpCode.PackageManagement.Cmdlets
 		[Parameter(ParameterSetName = "Updated")]
 		public SwitchParameter Updates { get; set; }
 		
+		[Parameter(ParameterSetName = "Available")]
+		[Parameter(ParameterSetName = "Updates")]
+		[Alias("Prerelease")]
+		public SwitchParameter IncludePrerelease { get; set; }
+		
 		[Parameter(Position = 0)]
 		public string Filter { get; set; }
 		
@@ -140,7 +145,11 @@ namespace ICSharpCode.PackageManagement.Cmdlets
 		
 		IQueryable<IPackage> FilterPackages(IQueryable<IPackage> packages)
 		{
-			return packages.Find(Filter);
+			IQueryable<IPackage> filteredPackages = packages.Find(Filter);
+			if (IncludePrerelease.IsPresent) {
+				return filteredPackages;
+			}
+			return filteredPackages.Where(package => package.IsLatestVersion);
 		}
 		
 		IQueryable<IPackage> GetUpdatedPackages()

src/AddIns/Misc/PackageManagement/Cmdlets/Test/Src/GetPackageCmdletTests.cs

@@ -50,6 +50,11 @@ namespace PackageManagement.Cmdlets.Tests
 			cmdlet.Updates = new SwitchParameter(true);
 		}
 		
+		void EnablePrereleaseParameter()
+		{
+			cmdlet.IncludePrerelease = new SwitchParameter(true);
+		}
+		
 		FakePackage AddPackageToSpecifiedProjectManagerLocalRepository(string id, string version)
 		{
 			FakePackage package = FakePackage.CreatePackageWithVersion(id, version);
@@ -523,5 +528,45 @@ namespace PackageManagement.Cmdlets.Tests
 			
 			Assert.AreEqual("Test", projectName);
 		}
+		
+		[Test]
+		public void ProcessRecord_ListAvailableAndPrereleasePackagesWithFilter_ReturnsFilteredPrereleasePackages()
+		{
+			CreateCmdlet();
+			FakePackageRepository repository = fakeRegisteredPackageRepositories.FakePackageRepository;
+			FakePackage expectedPackage = repository.AddFakePackageWithVersion("B", "2.1.0-beta");
+			EnableListAvailableParameter();
+			EnablePrereleaseParameter();
+			SetFilterParameter("B");
+			
+			RunCmdlet();
+			
+			List<object> actualPackages = fakeCommandRuntime.ObjectsPassedToWriteObject;
+			var expectedPackages = new FakePackage[] {
+				expectedPackage
+			};
+			
+			CollectionAssert.AreEqual(expectedPackages, actualPackages);
+		}
+		
+		[Test]
+		public void ProcessRecord_ListAvailableWithFilterAndOnlineRepositoryHasPrereleasePackages_ReturnsNoPrereleasePackages()
+		{
+			CreateCmdlet();
+			FakePackageRepository repository = fakeRegisteredPackageRepositories.FakePackageRepository;
+			FakePackage expectedPackage = repository.AddFakePackageWithVersion("B", "2.1.0");
+			FakePackage package = repository.AddFakePackageWithVersion("B", "2.1.0-beta");
+			EnableListAvailableParameter();
+			SetFilterParameter("B");
+			
+			RunCmdlet();
+			
+			List<object> actualPackages = fakeCommandRuntime.ObjectsPassedToWriteObject;
+			var expectedPackages = new FakePackage[] {
+				expectedPackage
+			};
+			
+			CollectionAssert.AreEqual(expectedPackages, actualPackages);
+		}
 	}
 }

src/AddIns/Misc/PackageManagement/Project/Src/Design/FakePackageRepository.cs

@@ -46,6 +46,7 @@ namespace ICSharpCode.PackageManagement.Design
 		public FakePackage AddFakePackageWithVersion(string packageId, string version)
 		{
 			var package = FakePackage.CreatePackageWithVersion(packageId, version);
+			package.IsLatestVersion = package.IsReleaseVersion();
 			FakePackages.Add(package);
 			return package;
 		}