diff --git a/test/Microsoft.NET.Build.Tests/GivenThatWeWantToBuildALibraryWithTfm.cs b/test/Microsoft.NET.Build.Tests/GivenThatWeWantToBuildALibraryWithTfm.cs
index b66c9996c1e3..a997eaef6803 100644
--- a/test/Microsoft.NET.Build.Tests/GivenThatWeWantToBuildALibraryWithTfm.cs
+++ b/test/Microsoft.NET.Build.Tests/GivenThatWeWantToBuildALibraryWithTfm.cs
@@ -28,7 +28,7 @@ public static IEnumerable<object[]> GetTestData()
             {
                 new object[] 
                 {
-                    "monoandroid", "", false, false, false, false
+                    "monoandroid", "$(MSBuildExtensionsPath)\\Xamarin\\Android\\Xamarin.Android.CSharp.targets", false, false, false, false
                 },
                 new object[]
                 {
@@ -44,59 +44,63 @@ public static IEnumerable<object[]> GetTestData()
                 },
                 new object[]
                 {
-                    "portable-win81+wpa81", "", true, false, false, true
+                    "portable-win81+wpa81", "$(MSBuildExtensionsPath)\\Microsoft\\Portable\\v4.6\\Microsoft.Portable.CSharp.targets", true, false, false, true
                 },
                 new object[]
                 {
-                    "portable-net451+wpa81+win81", "", true, false, false, false
+                    "portable-net451+wpa81+win81", "$(MSBuildExtensionsPath)\\Microsoft\\Portable\\v4.6\\Microsoft.Portable.CSharp.targets", true, false, false, false
                 },
                 new object[]
                 {
-                    "portable-net45+win8+wp8+wpa81", "", true, false, false, false
+                    "portable-net45+win8+wp8+wpa81", "$(MSBuildExtensionsPath)\\Microsoft\\Portable\\v4.5\\Microsoft.Portable.CSharp.targets", true, false, false, false
                 },
                 new object[]
                 {
-                    "sl5", "", true, false, false, false
+                    "portable-net4+sl5+win8+wpa81+wp8", "$(MSBuildExtensionsPath)\\Microsoft\\Portable\\v4.0\\Microsoft.Portable.CSharp.targets", true, false, false, false
                 },
                 new object[]
                 {
-                    "win8", "", true, false, false, true
+                    "sl5", "$(MSBuildProgramFiles32)\\MSBuild\\Microsoft\\Silverlight\\v5.0\\Microsoft.Silverlight.CSharp.targets", true, false, false, false
                 },
                 new object[]
                 {
-                    "win81", "", true, false, false, true
+                    "win8", "$(MSBuildExtensionsPath)\\Microsoft\\WindowsXaml\\v15.0\\Microsoft.Windows.UI.Xaml.CSharp.targets", true, false, false, true
                 },
                 new object[]
                 {
-                    "wp8", "", true, false, false, false
+                    "win81", "$(MSBuildExtensionsPath)\\Microsoft\\WindowsXaml\\v15.0\\Microsoft.Windows.UI.Xaml.CSharp.targets", true, false, false, true
                 },
                 new object[]
                 {
-                    "wp81", "", true, false, false, false
+                    "wp8", "$(MSBuildProgramFiles32)\\MSBuild\\Microsoft\\WindowsPhone\\v8.0\\Microsoft.WindowsPhone.CSharp.targets", true, false, false, false
                 },
                 new object[]
                 {
-                    "wpa81", "", true, false, false, true
+                    "wp81", "$(MSBuildProgramFiles32)\\MSBuild\\Microsoft\\WindowsPhone\\v8.1\\Microsoft.WindowsPhone.CSharp.targets", true, false, false, false
                 },
                 new object[]
                 {
-                    "uap10.0", "", false, false, false, true
+                    "wpa81", "$(MSBuildExtensionsPath)\\Microsoft\\WindowsXaml\\v15.0\\Microsoft.Windows.UI.Xaml.CSharp.targets", true, false, false, true
                 },
                 new object[]
                 {
-                    "xamarinios", "", false, true, false, false
+                    "uap10.0", "$(MSBuildExtensionsPath)\\Microsoft\\WindowsXaml\\v15.0\\Microsoft.Windows.UI.Xaml.CSharp.targets", false, false, false, true
                 },
                 new object[]
                 {
-                    "xamarinmac", "", false, false, false, false
+                    "xamarinios", "$(MSBuildExtensionsPath)\\Xamarin\\iOS\\Xamarin.iOS.CSharp.targets", false, true, false, false
                 },
                 new object[]
                 {
-                    "xamarintvos", "", false, true, false, false
+                    "xamarinmac", "$(MSBuildExtensionsPath)\\Xamarin\\Mac\\Xamarin.Mac.CSharp.targets", false, false, false, false
                 },
                 new object[]
                 {
-                    "xamarinwatchos", "", false, true, false, false
+                    "xamarintvos", "$(MSBuildExtensionsPath)\\Xamarin\\TVOS\\Xamarin.TVOS.CSharp.targets", false, true, false, false
+                },
+                new object[]
+                {
+                    "xamarinwatchos", "$(MSBuildExtensionsPath)\\Xamarin\\WatchOS\\Xamarin.WatchOS.CSharp.targets", false, true, false, false
                 },
             };
         }
@@ -110,8 +114,8 @@ public void It_builds_the_tfm_library_successfully_on_windows(string tfm, string
             {
                 return;
             }
-
-            // TODO: Check existence of targets
+            
+            var targetsExist = TargetsExist(langTargets);
 
             var testAsset = _testAssetsManager
                 .CopyTestAsset("LibraryWithTfm")
@@ -129,11 +133,23 @@ public void It_builds_the_tfm_library_successfully_on_windows(string tfm, string
             var libraryProjectDirectory = Path.Combine(testAsset.TestRoot, "TheLibrary");
 
             var buildCommand = new BuildCommand(Stage0MSBuild, libraryProjectDirectory);
-            buildCommand
-                .Execute()
-                .Should()
-                .Pass();
 
+            if (targetsExist)
+            {
+                buildCommand
+                    .Execute()
+                    .Should()
+                    .Pass();
+            }
+            else
+            {
+                buildCommand
+                    .Execute()
+                    .Should()
+                    .Fail()
+                    .And
+                    .HaveStdOutContaining("Ensure correct tooling is installed");
+            }
             var outputDirectory = buildCommand.GetOutputDirectory(tfm);
 
             var filesToCheck = new List<string>
@@ -153,5 +169,29 @@ public void It_builds_the_tfm_library_successfully_on_windows(string tfm, string
 
             outputDirectory.Should().HaveFiles(filesToCheck);
         }
+
+        private bool TargetsExist(string targets)
+        {
+            if (!UsingFullFrameworkMSBuild)
+                return false;
+
+            if (targets == null)
+                return true; // default for SDK, not testing here
+            
+            // MSBuild\15.0\bin\MSBuild.exe
+            string msbuildPath = Environment.GetEnvironmentVariable("DOTNET_SDK_TEST_MSBUILD_PATH");
+
+            // MSBuild
+            var msbuildRoot = new DirectoryInfo(Path.GetDirectoryName(msbuildPath)).Parent.Parent;
+
+            // program files (x86)
+            var progFiles = Environment.GetEnvironmentVariable("ProgramFiles(x86)");
+
+            // do our substitutions
+            var fullPathToTargets = targets.Replace("$(MSBuildExtensionsPath)", msbuildRoot.FullName)
+                                           .Replace("$(MSBuildProgramFiles32)", progFiles);
+
+            return File.Exists(fullPathToTargets);
+        }
     }
 }
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