Issue 21978. Put function 'main' first when sorting members.

pkg/analysis_server/test/services/correction/sort_members_test.dart

Index: pkg/analysis_server/test/services/correction/sort_members_test.dart
diff --git a/pkg/analysis_server/test/services/correction/sort_members_test.dart b/pkg/analysis_server/test/services/correction/sort_members_test.dart
index 70eb57055cc12b4f2712b9e1a04e63cd44189f7b..c9c315d53dcf01ed52170c1ddc5e2bc5b2ede1f1 100644
--- a/pkg/analysis_server/test/services/correction/sort_members_test.dart
+++ b/pkg/analysis_server/test/services/correction/sort_members_test.dart
@@ -483,7 +483,7 @@ typedef FC();
 import 'dart:a';
 import 'package:b';
 
-main() {
+foo() {
 }
 
 f() => null;
@@ -496,11 +496,31 @@ import 'package:b';
 
 f() => null;
 
-main() {
+foo() {
 }
 ''');
   }
 
+  void test_unitMembers_mainFirst() {
+    _parseTestUnit(r'''
+class C {}
+aaa() {}
+get bbb() {}
+class A {}
+main() {}
+class B {}
+''');
+    // validate change
+    _assertSort(r'''
+main() {}
+get bbb() {}
+aaa() {}
+class A {}
+class B {}
+class C {}
+''');
+  }
+
   void test_unitMembers_mix() {
     _parseTestUnit(r'''
 _mmm() {}