Make sure that path is correct on all test platforms

In CL https://dart-review.googlesource.com/c/sdk/+/89441 I added
assertions to check the elementUri for completion suggestions.
However, in the case of a file elementUri as in
local_reference_contributor_test.dart, we need to normalize the
file path for other operating systems (eg windows).

R=brianwilkerson@google.com

Change-Id: I88436fc3cf93aad98f072b4cd75d66217a3faabd
Reviewed-on: https://dart-review.googlesource.com/c/89761
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Commit-Queue: Ari Aye <ariaye@google.com>
diff --git a/pkg/analysis_server/test/services/completion/dart/local_reference_contributor_test.dart b/pkg/analysis_server/test/services/completion/dart/local_reference_contributor_test.dart
index 46f6151..d484f79 100644
--- a/pkg/analysis_server/test/services/completion/dart/local_reference_contributor_test.dart
+++ b/pkg/analysis_server/test/services/completion/dart/local_reference_contributor_test.dart
@@ -5,6 +5,7 @@
 import 'package:analysis_server/src/protocol_server.dart';
 import 'package:analysis_server/src/provisional/completion/dart/completion_dart.dart';
 import 'package:analysis_server/src/services/completion/dart/local_reference_contributor.dart';
+import 'package:analyzer/file_system/memory_file_system.dart';
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
@@ -72,7 +73,7 @@
         relevance: DART_RELEVANCE_LOCAL_FUNCTION,
         defaultArgListString: 'a, b',
         defaultArgumentListTextRanges: [0, 1, 3, 1]);
-    expect(cs.elementUri, equals('/home/test/lib/test.dart'));
+    expect(cs.elementUri, equals(convertPath('/home/test/lib/test.dart')));
   }
 
   test_ArgDefaults_function_none() async {