Pubspec-specified analysis configuration (#26359).

pkg/analyzer/test/source/config_test.dart

+// Copyright (c) 2016, 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:analyzer/source/config.dart';
+import 'package:unittest/unittest.dart';
+import 'package:yaml/yaml.dart';
+
+main() {
+  group('Analysis Config', () {
+    test('parseConfigSource', () {
+      String source = r'''
+analyzer:
+  configuration: google/strict
+''';
+      YamlMap options = loadYamlNode(source);
+      AnalysisConfigurationDescriptor descriptor =
+          new AnalysisConfigurationDescriptor.fromAnalyzerOptions(
+              options['analyzer']);
+      expect(descriptor.package, 'google');
+      expect(descriptor.pragma, 'strict');
+    });
+  });
+}