[Xamarin.Android.Build.Tests] Add tests for <ResolveSdks/> (#1321)

This commit adds a basic unit test for the `<ResolveSdks/>` task.

src/Xamarin.Android.Build.Tasks/Tests/Xamarin.Android.Build.Tests/ResolveSdksTaskTests.cs

@@ -0,0 +1,80 @@
+using System;
+using NUnit.Framework;
+using Xamarin.ProjectTools;
+using System.IO;
+using System.Linq;
+using Microsoft.Build.Framework;
+using System.Text;
+using Xamarin.Android.Tasks;
+using Microsoft.Build.Utilities;
+
+namespace Xamarin.Android.Build.Tests {
+
+	[TestFixture]
+	[Parallelizable (ParallelScope.Children)]
+	public class ResolveSdksTaskTests : BaseTest {
+		[Test]
+		public void ResolveSdkTiming ()
+		{
+			var path = Path.Combine ("temp", TestName);
+			var androidSdkPath = CreateFauxAndroidSdkDirectory (Path.Combine (path, "android-sdk"), "26.0.3");
+			string javaExe = string.Empty;
+			var javaPath = CreateFauxJavaSdkDirectory (Path.Combine (path, "jdk"), "1.8.0", out javaExe);
+			var referencePath = CreateFauxReferencesDirectory (Path.Combine (path, "references"), new ApiInfo [] {
+				new ApiInfo () { Id = 26, Level = 26, Name = "Oreo", FrameworkVersion = "v8.0", Stable = true },
+				new ApiInfo () { Id = 27, Level = 27, Name = "Oreo", FrameworkVersion = "v8.1", Stable = true },
+			});
+			IBuildEngine engine = new MockBuildEngine (TestContext.Out);
+			var task = new ResolveSdks {
+				BuildEngine = engine
+			};
+			task.AndroidSdkPath = androidSdkPath;
+			task.AndroidNdkPath = androidSdkPath;
+			task.JavaSdkPath = javaPath;
+			task.TargetFrameworkVersion = "v8.0";
+			task.AndroidSdkBuildToolsVersion = "26.0.3";
+			task.BuildingInsideVisualStudio = "true";
+			task.UseLatestAndroidPlatformSdk = false;
+			task.AotAssemblies = false;
+			task.LatestSupportedJavaVersion = "1.8.0";
+			task.MinimumSupportedJavaVersion = "1.7.0";
+			task.ReferenceAssemblyPaths = new string [] {
+				Path.Combine (referencePath, "MonoAndroid"),
+			};
+			task.CacheFile = Path.Combine (Root, path, "sdk.xml");
+			task.SequencePointsMode = "None";
+			task.JavaToolExe = javaExe;
+			var start = DateTime.UtcNow;
+			Assert.IsTrue (task.Execute ());
+			var executionTime = DateTime.UtcNow - start;
+			Assert.LessOrEqual (executionTime, TimeSpan.FromSeconds(1), "Task should not take more than 1 second to run.");
+			Assert.AreEqual (task.AndroidApiLevel, "26", "AndroidApiLevel should be 26");
+			Assert.AreEqual (task.TargetFrameworkVersion, "v8.0", "TargetFrameworkVersion should be v8.0");
+			Assert.AreEqual (task.AndroidApiLevelName, "26", "AndroidApiLevelName should be 26");
+			Assert.AreEqual (task.SupportedApiLevel, "26", "SupportedApiLevel should be 26");
+			Assert.NotNull (task.ReferenceAssemblyPaths, "ReferenceAssemblyPaths should not be null.");
+			Assert.AreEqual (task.ReferenceAssemblyPaths.Length, 1, "ReferenceAssemblyPaths should have 1 entry.");
+			Assert.AreEqual (task.ReferenceAssemblyPaths[0], Path.Combine (referencePath, "MonoAndroid"), $"ReferenceAssemblyPaths should be {Path.Combine (referencePath, "MonoAndroid")}.");
+			var expected = Path.Combine (Root);
+			Assert.AreEqual (task.MonoAndroidToolsPath, expected, $"MonoAndroidToolsPath should be {expected}");
+			expected = Path.Combine (Root, "Darwin" + Path.DirectorySeparatorChar);
+			Assert.AreEqual (task.MonoAndroidBinPath, expected, $"MonoAndroidBinPath should be {expected}");
+			Assert.AreEqual (task.MonoAndroidIncludePath, null, "MonoAndroidIncludePath should be null");
+			//Assert.AreEqual (task.AndroidNdkPath, "26", "AndroidNdkPath should be 26");
+			Assert.AreEqual (task.AndroidSdkPath, androidSdkPath, $"AndroidSdkPath should be {androidSdkPath}");
+			Assert.AreEqual (task.JavaSdkPath, javaPath, $"JavaSdkPath should be {javaPath}");
+			expected = Path.Combine (androidSdkPath, "build-tools", "26.0.3");
+			Assert.AreEqual (task.AndroidSdkBuildToolsPath, expected, $"AndroidSdkBuildToolsPath should be {expected}");
+			Assert.AreEqual (task.AndroidSdkBuildToolsBinPath, expected, "AndroidSdkBuildToolsBinPath should be {expected}");
+			Assert.AreEqual (task.ZipAlignPath, expected, "ZipAlignPath should be {expected}");
+			Assert.AreEqual (task.AndroidSequencePointsMode, "None", "AndroidSequencePointsMode should be None");
+			expected = Path.Combine (androidSdkPath, "tools");
+			Assert.AreEqual (task.LintToolPath, expected, $"LintToolPath should be {expected}");
+			expected = Path.Combine (androidSdkPath, "build-tools", "26.0.3", "lib", "apksigner.jar");
+			Assert.AreEqual (task.ApkSignerJar, expected, $"ApkSignerJar should be {expected}");
+			Assert.AreEqual (task.AndroidUseApkSigner, false, "AndroidUseApkSigner should be false");
+			Assert.AreEqual (task.JdkVersion, "1.8.0", "JdkVersion should be 1.8.0");
+			Assert.AreEqual (task.MinimumRequiredJdkVersion, "1.8", "MinimumRequiredJdkVersion should be 1.8");
+		}
+	}
+}

src/Xamarin.Android.Build.Tasks/Tests/Xamarin.Android.Build.Tests/Utilities/BaseTest.cs

@@ -122,6 +122,7 @@ protected string CreateFauxAndroidSdkDirectory (string path, string buildToolsVe
 			File.WriteAllText (Path.Combine (androidSdkPlatformToolsPath, IsWindows ? "adb.exe" : "adb"), "");
 			File.WriteAllText (Path.Combine (androidSdkBuildToolsPath, IsWindows ? "zipalign.exe" : "zipalign"), "");
 			File.WriteAllText (Path.Combine (androidSdkBuildToolsPath, IsWindows ? "aapt.exe" : "aapt"), "");
+			File.WriteAllText (Path.Combine (androidSdkToolsPath, IsWindows ? "lint.exe" : "lint"), "");
 
 			for (int i=minApiLevel; i < maxApiLevel; i++) {
 				var dir = Path.Combine (androidSdkPlatformsPath, $"android-{i}");

src/Xamarin.Android.Build.Tasks/Tests/Xamarin.Android.Build.Tests/Xamarin.Android.Build.Tests.csproj

@@ -73,5 +73,6 @@
     <Compile Include="ManifestTest.OSS.cs" />
     <Compile Include="AndroidRegExTests.cs" />
     <Compile Include="GetDependenciesTests.cs" />
+    <Compile Include="ResolveSdksTaskTests.cs" />
   </ItemGroup>
 </Project>