Test configuration

Author: kevmoo

json_serializable/pubspec.yaml

@@ -21,5 +21,6 @@ dev_dependencies:
   build_test: ">=0.9.0 <0.11.0"
   collection: ^1.14.0
   dart_style: ^1.0.0
+  logging: ^0.11.3+1
   test: ^0.12.3
   yaml: ^2.1.13

json_serializable/test/config_test.dart

@@ -0,0 +1,76 @@
+// Copyright (c) 2018, 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 'dart:async';
+
+import 'package:build/build.dart';
+import 'package:json_serializable/builder.dart';
+import 'package:logging/logging.dart';
+import 'package:source_gen/source_gen.dart';
+import 'package:test/test.dart';
+
+final _throwsCastError = throwsA(const isInstanceOf<CastError>());
+
+void main() {
+  StreamSubscription sub;
+  final records = <LogRecord>[];
+
+  setUpAll(() {
+    sub = log.onRecord.listen(records.add);
+  });
+
+  tearDownAll(() async {
+    await sub.cancel();
+  });
+
+  setUp(records.clear);
+
+  test('empty', () async {
+    var builder = jsonSerializable(BuilderOptions.empty) as PartBuilder;
+    expect(builder, isNotNull);
+    expect(records, isEmpty);
+  });
+
+  test('valid config', () async {
+    var builder =
+        jsonSerializable(const BuilderOptions(_validConfig)) as PartBuilder;
+    expect(builder, isNotNull);
+
+    expect(records, isEmpty);
+  });
+
+  test('unsupported configuration', () async {
+    var builder =
+        jsonSerializable(const BuilderOptions(const {'unsupported': 'config'}))
+            as PartBuilder;
+    expect(builder, isNotNull);
+
+    expect(records.single.message,
+        'These options were ignored: `{unsupported: config}`.');
+  });
+
+  group('invalid config', () {
+    for (var entry in _invalidConfig.entries) {
+      test(entry.key, () {
+        var config = new Map<String, dynamic>.from(_validConfig);
+        config[entry.key] = entry.value;
+
+        expect(() => jsonSerializable(new BuilderOptions(config)),
+            _throwsCastError);
+      });
+    }
+  });
+}
+
+const _validConfig = const {
+  'header': 'header',
+  'use_wrappers': true,
+  'any_map': true
+};
+
+const _invalidConfig = const {
+  'header': true,
+  'use_wrappers': 42,
+  'any_map': 42
+};