Add the tests of the spec generator to the unit tests

pkg/analysis_server/test/test_all.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
+import '../tool/spec/check_all_test.dart' as check_spec;
 import 'analysis/test_all.dart' as analysis_all;
 import 'analysis_server_test.dart' as analysis_server_test;
 import 'channel/test_all.dart' as channel_test;
 import 'completion_test.dart' as completion_test;
 import 'context_manager_test.dart' as context_manager_test;
 import 'domain_analysis_test.dart' as domain_analysis_test;
 import 'domain_completion_test.dart' as domain_completion_test;
 import 'domain_diagnostic_test.dart' as domain_experimental_test;
 import 'domain_execution_test.dart' as domain_execution_test;
 import 'domain_server_test.dart' as domain_server_test;
@@ skipping 22 matching lines @@
     domain_experimental_test.main();
     domain_server_test.main();
     edit_all.main();
     plugin_all.main();
     protocol_server_test.main();
     protocol_test.main();
     search_all.main();
     services_all.main();
     socket_server_test.main();
     src_all.main();
+    defineReflectiveSuite(() {
+      defineReflectiveTests(SpecTest);
+    }, name: 'spec');
   }, name: 'analysis_server');
 }
+
+@reflectiveTest
+class SpecTest {
+  test_specHasBeenGenerated() {
+    check_spec.main();
+  }
+}