Add the analysis options path to the diagnostics page.

pkg/analyzer/test/src/context/builder_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.
 
 library analyzer.test.src.context.context_builder_test;
 
+import 'package:analyzer/context/context_root.dart';
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/file_system/memory_file_system.dart';
 import 'package:analyzer/source/package_map_resolver.dart';
 import 'package:analyzer/src/command_line/arguments.dart';
 import 'package:analyzer/src/context/builder.dart';
 import 'package:analyzer/src/context/source.dart';
 import 'package:analyzer/src/generated/bazel.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/sdk.dart';
 import 'package:analyzer/src/generated/source.dart';
@@ skipping 868 matching lines @@
         '''
 linter:
   rules:
     - empty_constructor_bodies
 ''');
 
     AnalysisOptions options = builder.getAnalysisOptions(path);
     _expectEqualOptions(options, new AnalysisOptionsImpl());
   }
 
+  void test_getAnalysisOptions_optionsPath() {
+    String path = resourceProvider.convertPath('/some/directory/path');
+    String filePath =
+        pathContext.join(path, AnalysisEngine.ANALYSIS_OPTIONS_YAML_FILE);
+    resourceProvider.newFile(
+        filePath,
+        '''
+linter:
+  rules:
+    - empty_constructor_bodies
+''');
+
+    ContextRoot root = new ContextRoot(path, []);
+    builder.getAnalysisOptions(path, contextRoot: root);
+    expect(root.optionsFilePath, equals(filePath));
+  }
+
   void test_getAnalysisOptions_noDefault_overrides() {
     AnalysisOptionsImpl expected = new AnalysisOptionsImpl();
     expected.enableSuperMixins = true;
     String path = resourceProvider.convertPath('/some/directory/path');
     String filePath =
         pathContext.join(path, AnalysisEngine.ANALYSIS_OPTIONS_YAML_FILE);
     resourceProvider.newFile(
         filePath,
         '''
 analyzer:
@@ skipping 154 matching lines @@
 class _MockLintRule implements LintRule {
   final String _name;
 
   _MockLintRule(this._name);
 
   @override
   String get name => _name;
 
   noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
 }