Linux hack

Author: tmat

test/dotnet-watch.Tests/FileWatcherTests.cs

@@ -99,6 +99,11 @@ public async Task NewFileInNewDirectory(bool usePolling, bool nested)
         {
             var dir = _testAssetManager.CreateTestDirectory(identifier: usePolling.ToString()).Path;
 
+            if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
+            {
+                Directory.CreateDirectory(Path.Combine(dir, ".dummy"));
+            }
+
             var dir1 = Path.Combine(dir, "dir1");
             var dir2 = nested ? Path.Combine(dir1, "dir2") : dir1;
             var fileInSubdir = Path.Combine(dir2, "file_in_subdir");
@@ -120,7 +125,12 @@ await TestOperation(
                 () =>
                 {
                     Directory.CreateDirectory(dir1);
-                    Directory.CreateDirectory(dir2);
+
+                    if (nested)
+                    {
+                        Directory.CreateDirectory(dir2);
+                    }
+
                     File.WriteAllText(fileInSubdir, string.Empty);
                 });
         }