Plugin config format validation (and tests).

pkg/analyzer/test/src/test_all.dart

Index: pkg/analyzer/test/src/test_all.dart
diff --git a/pkg/analyzer/test/src/test_all.dart b/pkg/analyzer/test/src/test_all.dart
index 5aefb6678a0961af4d9513d7321f009b9f18a619..f9ad08af9e6454da81645f74a10e1e5b0d2366e0 100644
--- a/pkg/analyzer/test/src/test_all.dart
+++ b/pkg/analyzer/test/src/test_all.dart
@@ -8,6 +8,7 @@ import 'package:unittest/unittest.dart';
 
 import '../utils.dart';
 import 'context/test_all.dart' as context;
+import 'plugin/plugin_config_test.dart' as plugin;
 import 'task/test_all.dart' as task;
 import 'util/test_all.dart' as util;
 
@@ -16,6 +17,7 @@ main() {
   initializeTestEnvironment();
   group('src tests', () {
     context.main();
+    plugin.main();
     task.main();
     util.main();
   });