Normalize test paths.

pkg/watcher/test/utils.dart

Index: pkg/watcher/test/utils.dart
diff --git a/pkg/watcher/test/utils.dart b/pkg/watcher/test/utils.dart
index 18bec9728d5ac9e6f25720c3925c9d71c77c4b1e..3bbe0e1a651c2dba57264d6679afef604e31f9d8 100644
--- a/pkg/watcher/test/utils.dart
+++ b/pkg/watcher/test/utils.dart
@@ -109,7 +109,10 @@ DirectoryWatcher createWatcher({String dir, bool waitForReady}) {
 /// Validates that events are delivered for all paths in [paths], but allows
 /// them in any order.
 void expectEvents(ChangeType type, Iterable<String> paths) {
-  var pathSet = paths.map((path) => p.join(_sandboxDir, path)).toSet();
+  var pathSet = paths
+      .map((path) => p.join(_sandboxDir, path))
+      .map(p.normalize)
+      .toSet();
 
   // Create an expectation for as many paths as we have.
   var futures = [];