add another test

Author: danmoseley

src/tasks/tests/ConvertDllsToWebCilTests.cs

@@ -10,12 +10,12 @@
 
 namespace Microsoft.NET.Sdk.WebAssembly.Tests
 {
-    public static class ConvertDllsToWebCilTests
+    public class ConvertDllsToWebCilTests
     {
-        private static ConvertDllsToWebCil task;
-        private static List<BuildErrorEventArgs> errors;
+        private ConvertDllsToWebCil task;
+        private List<BuildErrorEventArgs> errors;
 
-        static ConvertDllsToWebCilTests()
+        public ConvertDllsToWebCilTests()
         {
             task = new ConvertDllsToWebCil();
             var buildEngine = new Mock<IBuildEngine>();
@@ -25,7 +25,7 @@ static ConvertDllsToWebCilTests()
         }
 
         [Fact]
-        public static void TestEmptyInput()
+        public void TestEmptyInput()
         {
             string input = Path.Combine(Path.GetTempPath(), Path.GetRandomFileName() + ".dll");
 
@@ -49,5 +49,29 @@ public static void TestEmptyInput()
             }
         }
 
+        [Fact]
+        public void TestInvalidDirectoryInput()
+        {
+            string input = Path.Combine(Path.GetTempPath(), Path.GetRandomFileName() + ".dll");
+
+            try
+            {
+                Directory.CreateDirectory(input);
+
+                task.Candidates = new ITaskItem[] { new TaskItem(input) };
+                task.IsEnabled = true;
+                task.OutputPath = task.IntermediateOutputPath = Path.GetTempPath();
+
+                bool result = task.Execute();
+
+                Assert.False(result);
+                Assert.Single(errors);
+                Assert.Contains(input, errors[0].Message);
+            }
+            finally
+            {
+                Directory.Delete(input);
+            }
+        }
     }
 }