Add tests for resolveRelativeUri() and a workaround.

pkg/analyzer/test/generated/test_all.dart

Index: pkg/analyzer/test/generated/test_all.dart
diff --git a/pkg/analyzer/test/generated/test_all.dart b/pkg/analyzer/test/generated/test_all.dart
index 8aead2a6905ef7150c1c91060d6990f1cfba585b..63b357df9a6cc52e982de1b76cb07dbd94730a05 100644
--- a/pkg/analyzer/test/generated/test_all.dart
+++ b/pkg/analyzer/test/generated/test_all.dart
@@ -35,6 +35,7 @@ import 'static_type_warning_code_test.dart' as static_type_warning_code_test;
 import 'static_warning_code_test.dart' as static_warning_code_test;
 import 'strong_mode_test.dart' as strong_mode_test;
 import 'type_system_test.dart' as type_system_test;
+import 'utilities_dart_test.dart' as utilities_dart_test;
 import 'utilities_test.dart' as utilities_test;
 
 /// Utility for manually running all tests.
@@ -68,6 +69,7 @@ main() {
     static_warning_code_test.main();
     strong_mode_test.main();
     type_system_test.main();
+    utilities_dart_test.main();
     utilities_test.main();
   });
 }