Fix to give `LineInfo` to options error spans.

pkg/analysis_server/test/integration/analysis/analysis_options_test.dart

+// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file

[Brian Wilkerson, 2015/10/27 13:18:29]

2014 --> 2015

[pquitslund, 2015/10/27 15:31:44]

Done.

+// 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 test.integration.analysis.analysis_options;
+
+import 'package:analysis_server/plugin/protocol/protocol.dart';
+import 'package:test_reflective_loader/test_reflective_loader.dart';
+import 'package:unittest/unittest.dart';
+
+import '../../utils.dart';
+import '../integration_tests.dart';
+
+main() {
+  initializeTestEnvironment();
+  defineReflectiveTests(OptionsIntegrationTest);
+}
+
+@reflectiveTest
+class OptionsIntegrationTest extends AbstractAnalysisServerIntegrationTest {
+  test_option_warning() async {
+    String options = sourcePath('.analysis_options');
+    writeFile(
+        options,
+        '''
+linter:
+  rules:
+    - camel_case_typo # :)
+''');
+
+    standardAnalysisSetup();
+
+    await analysisFinished;
+
+    expect(currentAnalysisErrors[options], isList);
+    List<AnalysisError> errors = currentAnalysisErrors[options];
+    expect(errors, hasLength(1));
+    AnalysisError error = errors[0];
+    expect(error.location.file, options);
+    expect(error.severity, AnalysisErrorSeverity.WARNING);
+    expect(error.type, AnalysisErrorType.STATIC_WARNING);
+    expect(error.location.offset, 23);
+    expect(error.location.length, 'camel_case_typo'.length);
+    expect(error.location.startLine, 3);
+    expect(error.location.startColumn, 7);
+  }
+}