Move constant implementation out of generated

pkg/analyzer/test/test_all.dart

Index: pkg/analyzer/test/test_all.dart
diff --git a/pkg/analyzer/test/test_all.dart b/pkg/analyzer/test/test_all.dart
index 8155789e7865037359159634976937192b9f1794..7e454127f096f52dc52ae2ebb82b5421cf15e24e 100644
--- a/pkg/analyzer/test/test_all.dart
+++ b/pkg/analyzer/test/test_all.dart
@@ -7,6 +7,7 @@ library analyzer.test.test_all;
 import 'package:unittest/unittest.dart';
 
 import 'cancelable_future_test.dart' as cancelable_future_test;
+import 'context/test_all.dart' as context;
 import 'enum_test.dart' as enum_test;
 import 'file_system/test_all.dart' as file_system;
 import 'generated/test_all.dart' as generated;
@@ -21,6 +22,7 @@ main() {
   initializeTestEnvironment();
   group('analysis engine', () {
     cancelable_future_test.main();
+    context.main();
     enum_test.main();
     file_system.main();
     generated.main();