Issue 25538. Fix for notification and private methods.

pkg/analysis_server/test/analysis_abstract.dart

Index: pkg/analysis_server/test/analysis_abstract.dart
diff --git a/pkg/analysis_server/test/analysis_abstract.dart b/pkg/analysis_server/test/analysis_abstract.dart
index 5c0616ed71d85c8ad847a29a8c3559b4c4a932af..4faf108d8bb8da2dfa55a544a7e5ad7aaccc4a4e 100644
--- a/pkg/analysis_server/test/analysis_abstract.dart
+++ b/pkg/analysis_server/test/analysis_abstract.dart
@@ -32,7 +32,8 @@ int findIdentifierLength(String search) {
     int c = search.codeUnitAt(length);
     if (!(c >= 'a'.codeUnitAt(0) && c <= 'z'.codeUnitAt(0) ||
         c >= 'A'.codeUnitAt(0) && c <= 'Z'.codeUnitAt(0) ||
-        c >= '0'.codeUnitAt(0) && c <= '9'.codeUnitAt(0))) {
+        c >= '0'.codeUnitAt(0) && c <= '9'.codeUnitAt(0) ||
+        c == '_'.codeUnitAt(0))) {
       break;
     }
     length++;